Add a parser for GCC-style depfiles

Introduce the function cmReadGccDepfile that parses a GCC-style depfile
and returns its content. The implementation uses a lexer that is
modeled after the re2c implementation in Ninja.

The sample files of the autotest have been created with gcc 8.3.0.

This depfile reader is to be used by the Autogen facility to make use
of the depfiles that are generated by Qt's meta object compiler.

20 files changed, 3390 insertions, 1 deletions

diff --git a/Copyright.txt b/Copyright.txt
index 19f3deb6cc..b867d01785 100644
--- a/Copyright.txt
+++ b/Copyright.txt
@@ -99,6 +99,7 @@ The following individuals and institutions are among the Contributors:
 * Sebastian Holtermann <sebholt@xwmw.org>
 * Stephen Kelly <steveire@gmail.com>
 * Sylvain Joubert <joubert.sy@gmail.com>
+* The Qt Company Ltd.
 * Thomas Sondergaard <ts@medical-insight.com>
 * Tobias Hunger <tobias.hunger@qt.io>
 * Todd Gamblin <tgamblin@llnl.gov>
diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index ff313d66d1..c57f71347d 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -134,6 +134,9 @@ set(SRCS
   LexerParser/cmFortranParser.cxx
   LexerParser/cmFortranParserTokens.h
   LexerParser/cmFortranParser.y
+  LexerParser/cmGccDepfileLexer.cxx
+  LexerParser/cmGccDepfileLexer.h
+  LexerParser/cmGccDepfileLexer.in.l
   LexerParser/cmListFileLexer.c
   LexerParser/cmListFileLexer.in.l
 
@@ -270,6 +273,10 @@ set(SRCS
   cmFortranParserImpl.cxx
   cmFSPermissions.cxx
   cmFSPermissions.h
+  cmGccDepfileLexerHelper.cxx
+  cmGccDepfileLexerHelper.h
+  cmGccDepfileReader.cxx
+  cmGccDepfileReader.h
   cmGeneratedFileStream.cxx
   cmGeneratorExpressionContext.cxx
   cmGeneratorExpressionContext.h
diff --git a/Source/LexerParser/.gitattributes b/Source/LexerParser/.gitattributes
index bf70249788..63d9afb263 100644
--- a/Source/LexerParser/.gitattributes
+++ b/Source/LexerParser/.gitattributes
@@ -16,4 +16,6 @@
 /cmFortranLexer.h                  generated
 /cmFortranParser.cxx               generated
 /cmFortranParserTokens.h           generated
+/cmGccDepfileLexer.cxx             generated
+/cmGccDepfileLexer.h               generated
 /cmListFileLexer.c                 generated
diff --git a/Source/LexerParser/cmGccDepfileLexer.cxx b/Source/LexerParser/cmGccDepfileLexer.cxx
new file mode 100644
index 0000000000..a98969d591
--- /dev/null
+++ b/Source/LexerParser/cmGccDepfileLexer.cxx
@@ -0,0 +1,2210 @@
+#include "cmStandardLexer.h"
+
+#define FLEXINT_H 1
+#define  YY_INT_ALIGNED short int
+
+/* A lexical scanner generated by flex */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 6
+#define YY_FLEX_SUBMINOR_VERSION 4
+#if YY_FLEX_SUBMINOR_VERSION > 0
+#define FLEX_BETA
+#endif
+
+#ifdef yy_create_buffer
+#define cmGccDepfile_yy_create_buffer_ALREADY_DEFINED
+#else
+#define yy_create_buffer cmGccDepfile_yy_create_buffer
+#endif
+
+#ifdef yy_delete_buffer
+#define cmGccDepfile_yy_delete_buffer_ALREADY_DEFINED
+#else
+#define yy_delete_buffer cmGccDepfile_yy_delete_buffer
+#endif
+
+#ifdef yy_scan_buffer
+#define cmGccDepfile_yy_scan_buffer_ALREADY_DEFINED
+#else
+#define yy_scan_buffer cmGccDepfile_yy_scan_buffer
+#endif
+
+#ifdef yy_scan_string
+#define cmGccDepfile_yy_scan_string_ALREADY_DEFINED
+#else
+#define yy_scan_string cmGccDepfile_yy_scan_string
+#endif
+
+#ifdef yy_scan_bytes
+#define cmGccDepfile_yy_scan_bytes_ALREADY_DEFINED
+#else
+#define yy_scan_bytes cmGccDepfile_yy_scan_bytes
+#endif
+
+#ifdef yy_init_buffer
+#define cmGccDepfile_yy_init_buffer_ALREADY_DEFINED
+#else
+#define yy_init_buffer cmGccDepfile_yy_init_buffer
+#endif
+
+#ifdef yy_flush_buffer
+#define cmGccDepfile_yy_flush_buffer_ALREADY_DEFINED
+#else
+#define yy_flush_buffer cmGccDepfile_yy_flush_buffer
+#endif
+
+#ifdef yy_load_buffer_state
+#define cmGccDepfile_yy_load_buffer_state_ALREADY_DEFINED
+#else
+#define yy_load_buffer_state cmGccDepfile_yy_load_buffer_state
+#endif
+
+#ifdef yy_switch_to_buffer
+#define cmGccDepfile_yy_switch_to_buffer_ALREADY_DEFINED
+#else
+#define yy_switch_to_buffer cmGccDepfile_yy_switch_to_buffer
+#endif
+
+#ifdef yypush_buffer_state
+#define cmGccDepfile_yypush_buffer_state_ALREADY_DEFINED
+#else
+#define yypush_buffer_state cmGccDepfile_yypush_buffer_state
+#endif
+
+#ifdef yypop_buffer_state
+#define cmGccDepfile_yypop_buffer_state_ALREADY_DEFINED
+#else
+#define yypop_buffer_state cmGccDepfile_yypop_buffer_state
+#endif
+
+#ifdef yyensure_buffer_stack
+#define cmGccDepfile_yyensure_buffer_stack_ALREADY_DEFINED
+#else
+#define yyensure_buffer_stack cmGccDepfile_yyensure_buffer_stack
+#endif
+
+#ifdef yylex
+#define cmGccDepfile_yylex_ALREADY_DEFINED
+#else
+#define yylex cmGccDepfile_yylex
+#endif
+
+#ifdef yyrestart
+#define cmGccDepfile_yyrestart_ALREADY_DEFINED
+#else
+#define yyrestart cmGccDepfile_yyrestart
+#endif
+
+#ifdef yylex_init
+#define cmGccDepfile_yylex_init_ALREADY_DEFINED
+#else
+#define yylex_init cmGccDepfile_yylex_init
+#endif
+
+#ifdef yylex_init_extra
+#define cmGccDepfile_yylex_init_extra_ALREADY_DEFINED
+#else
+#define yylex_init_extra cmGccDepfile_yylex_init_extra
+#endif
+
+#ifdef yylex_destroy
+#define cmGccDepfile_yylex_destroy_ALREADY_DEFINED
+#else
+#define yylex_destroy cmGccDepfile_yylex_destroy
+#endif
+
+#ifdef yyget_debug
+#define cmGccDepfile_yyget_debug_ALREADY_DEFINED
+#else
+#define yyget_debug cmGccDepfile_yyget_debug
+#endif
+
+#ifdef yyset_debug
+#define cmGccDepfile_yyset_debug_ALREADY_DEFINED
+#else
+#define yyset_debug cmGccDepfile_yyset_debug
+#endif
+
+#ifdef yyget_extra
+#define cmGccDepfile_yyget_extra_ALREADY_DEFINED
+#else
+#define yyget_extra cmGccDepfile_yyget_extra
+#endif
+
+#ifdef yyset_extra
+#define cmGccDepfile_yyset_extra_ALREADY_DEFINED
+#else
+#define yyset_extra cmGccDepfile_yyset_extra
+#endif
+
+#ifdef yyget_in
+#define cmGccDepfile_yyget_in_ALREADY_DEFINED
+#else
+#define yyget_in cmGccDepfile_yyget_in
+#endif
+
+#ifdef yyset_in
+#define cmGccDepfile_yyset_in_ALREADY_DEFINED
+#else
+#define yyset_in cmGccDepfile_yyset_in
+#endif
+
+#ifdef yyget_out
+#define cmGccDepfile_yyget_out_ALREADY_DEFINED
+#else
+#define yyget_out cmGccDepfile_yyget_out
+#endif
+
+#ifdef yyset_out
+#define cmGccDepfile_yyset_out_ALREADY_DEFINED
+#else
+#define yyset_out cmGccDepfile_yyset_out
+#endif
+
+#ifdef yyget_leng
+#define cmGccDepfile_yyget_leng_ALREADY_DEFINED
+#else
+#define yyget_leng cmGccDepfile_yyget_leng
+#endif
+
+#ifdef yyget_text
+#define cmGccDepfile_yyget_text_ALREADY_DEFINED
+#else
+#define yyget_text cmGccDepfile_yyget_text
+#endif
+
+#ifdef yyget_lineno
+#define cmGccDepfile_yyget_lineno_ALREADY_DEFINED
+#else
+#define yyget_lineno cmGccDepfile_yyget_lineno
+#endif
+
+#ifdef yyset_lineno
+#define cmGccDepfile_yyset_lineno_ALREADY_DEFINED
+#else
+#define yyset_lineno cmGccDepfile_yyset_lineno
+#endif
+
+#ifdef yyget_column
+#define cmGccDepfile_yyget_column_ALREADY_DEFINED
+#else
+#define yyget_column cmGccDepfile_yyget_column
+#endif
+
+#ifdef yyset_column
+#define cmGccDepfile_yyset_column_ALREADY_DEFINED
+#else
+#define yyset_column cmGccDepfile_yyset_column
+#endif
+
+#ifdef yywrap
+#define cmGccDepfile_yywrap_ALREADY_DEFINED
+#else
+#define yywrap cmGccDepfile_yywrap
+#endif
+
+#ifdef yyalloc
+#define cmGccDepfile_yyalloc_ALREADY_DEFINED
+#else
+#define yyalloc cmGccDepfile_yyalloc
+#endif
+
+#ifdef yyrealloc
+#define cmGccDepfile_yyrealloc_ALREADY_DEFINED
+#else
+#define yyrealloc cmGccDepfile_yyrealloc
+#endif
+
+#ifdef yyfree
+#define cmGccDepfile_yyfree_ALREADY_DEFINED
+#else
+#define yyfree cmGccDepfile_yyfree
+#endif
+
+/* First, we deal with  platform-specific or compiler-specific issues. */
+
+/* begin standard C headers. */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/* end standard C headers. */
+
+/* flex integer type definitions */
+
+#ifndef FLEXINT_H
+#define FLEXINT_H
+
+/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+
+/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
+ * if you want the limit (max/min) macros for int types.
+ */
+#ifndef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS 1
+#endif
+
+#include <inttypes.h>
+typedef int8_t flex_int8_t;
+typedef uint8_t flex_uint8_t;
+typedef int16_t flex_int16_t;
+typedef uint16_t flex_uint16_t;
+typedef int32_t flex_int32_t;
+typedef uint32_t flex_uint32_t;
+#else
+typedef signed char flex_int8_t;
+typedef short int flex_int16_t;
+typedef int flex_int32_t;
+typedef unsigned char flex_uint8_t;
+typedef unsigned short int flex_uint16_t;
+typedef unsigned int flex_uint32_t;
+
+/* Limits of integral types. */
+#ifndef INT8_MIN
+#define INT8_MIN               (-128)
+#endif
+#ifndef INT16_MIN
+#define INT16_MIN              (-32767-1)
+#endif
+#ifndef INT32_MIN
+#define INT32_MIN              (-2147483647-1)
+#endif
+#ifndef INT8_MAX
+#define INT8_MAX               (127)
+#endif
+#ifndef INT16_MAX
+#define INT16_MAX              (32767)
+#endif
+#ifndef INT32_MAX
+#define INT32_MAX              (2147483647)
+#endif
+#ifndef UINT8_MAX
+#define UINT8_MAX              (255U)
+#endif
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX             (4294967295U)
+#endif
+
+#ifndef SIZE_MAX
+#define SIZE_MAX               (~(size_t)0)
+#endif
+
+#endif /* ! C99 */
+
+#endif /* ! FLEXINT_H */
+
+/* begin standard C++ headers. */
+
+/* TODO: this is always defined, so inline it */
+#define yyconst const
+
+#if defined(__GNUC__) && __GNUC__ >= 3
+#define yynoreturn __attribute__((__noreturn__))
+#else
+#define yynoreturn
+#endif
+
+/* Returned upon end-of-file. */
+#define YY_NULL 0
+
+/* Promotes a possibly negative, possibly signed char to an
+ *   integer in range [0..255] for use as an array index.
+ */
+#define YY_SC_TO_UI(c) ((YY_CHAR) (c))
+
+/* An opaque pointer. */
+#ifndef YY_TYPEDEF_YY_SCANNER_T
+#define YY_TYPEDEF_YY_SCANNER_T
+typedef void* yyscan_t;
+#endif
+
+/* For convenience, these vars (plus the bison vars far below)
+   are macros in the reentrant scanner. */
+#define yyin yyg->yyin_r
+#define yyout yyg->yyout_r
+#define yyextra yyg->yyextra_r
+#define yyleng yyg->yyleng_r
+#define yytext yyg->yytext_r
+#define yylineno (YY_CURRENT_BUFFER_LVALUE->yy_bs_lineno)
+#define yycolumn (YY_CURRENT_BUFFER_LVALUE->yy_bs_column)
+#define yy_flex_debug yyg->yy_flex_debug_r
+
+/* Enter a start condition.  This macro really ought to take a parameter,
+ * but we do it the disgusting crufty way forced on us by the ()-less
+ * definition of BEGIN.
+ */
+#define BEGIN yyg->yy_start = 1 + 2 *
+/* Translate the current start state into a value that can be later handed
+ * to BEGIN to return to the state.  The YYSTATE alias is for lex
+ * compatibility.
+ */
+#define YY_START ((yyg->yy_start - 1) / 2)
+#define YYSTATE YY_START
+/* Action number for EOF rule of a given start state. */
+#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
+/* Special action meaning "start processing a new file". */
+#define YY_NEW_FILE yyrestart( yyin , yyscanner )
+#define YY_END_OF_BUFFER_CHAR 0
+
+/* Size of default input buffer. */
+#ifndef YY_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k.
+ * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
+ * Ditto for the __ia64__ case accordingly.
+ */
+#define YY_BUF_SIZE 32768
+#else
+#define YY_BUF_SIZE 16384
+#endif /* __ia64__ */
+#endif
+
+/* The state buf must be large enough to hold one state per character in the main buffer.
+ */
+#define YY_STATE_BUF_SIZE   ((YY_BUF_SIZE + 2) * sizeof(yy_state_type))
+
+#ifndef YY_TYPEDEF_YY_BUFFER_STATE
+#define YY_TYPEDEF_YY_BUFFER_STATE
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+#endif
+
+#ifndef YY_TYPEDEF_YY_SIZE_T
+#define YY_TYPEDEF_YY_SIZE_T
+typedef size_t yy_size_t;
+#endif
+
+#define EOB_ACT_CONTINUE_SCAN 0
+#define EOB_ACT_END_OF_FILE 1
+#define EOB_ACT_LAST_MATCH 2
+
+    #define YY_LESS_LINENO(n)
+    #define YY_LINENO_REWIND_TO(ptr)
+
+/* Return all but the first "n" matched characters back to the input stream. */
+#define yyless(n) \
+	do \
+		{ \
+		/* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+		*yy_cp = yyg->yy_hold_char; \
+		YY_RESTORE_YY_MORE_OFFSET \
+		yyg->yy_c_buf_p = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
+		YY_DO_BEFORE_ACTION; /* set up yytext again */ \
+		} \
+	while ( 0 )
+#define unput(c) yyunput( c, yyg->yytext_ptr , yyscanner )
+
+#ifndef YY_STRUCT_YY_BUFFER_STATE
+#define YY_STRUCT_YY_BUFFER_STATE
+struct yy_buffer_state
+	{
+	FILE *yy_input_file;
+
+	char *yy_ch_buf;		/* input buffer */
+	char *yy_buf_pos;		/* current position in input buffer */
+
+	/* Size of input buffer in bytes, not including room for EOB
+	 * characters.
+	 */
+	int yy_buf_size;
+
+	/* Number of characters read into yy_ch_buf, not including EOB
+	 * characters.
+	 */
+	int yy_n_chars;
+
+	/* Whether we "own" the buffer - i.e., we know we created it,
+	 * and can realloc() it to grow it, and should free() it to
+	 * delete it.
+	 */
+	int yy_is_our_buffer;
+
+	/* Whether this is an "interactive" input source; if so, and
+	 * if we're using stdio for input, then we want to use getc()
+	 * instead of fread(), to make sure we stop fetching input after
+	 * each newline.
+	 */
+	int yy_is_interactive;
+
+	/* Whether we're considered to be at the beginning of a line.
+	 * If so, '^' rules will be active on the next match, otherwise
+	 * not.
+	 */
+	int yy_at_bol;
+
+    int yy_bs_lineno; /**< The line count. */
+    int yy_bs_column; /**< The column count. */
+
+	/* Whether to try to fill the input buffer when we reach the
+	 * end of it.
+	 */
+	int yy_fill_buffer;
+
+	int yy_buffer_status;
+
+#define YY_BUFFER_NEW 0
+#define YY_BUFFER_NORMAL 1
+	/* When an EOF's been seen but there's still some text to process
+	 * then we mark the buffer as YY_EOF_PENDING, to indicate that we
+	 * shouldn't try reading from the input source any more.  We might
+	 * still have a bunch of tokens to match, though, because of
+	 * possible backing-up.
+	 *
+	 * When we actually see the EOF, we change the status to "new"
+	 * (via yyrestart()), so that the user can continue scanning by
+	 * just pointing yyin at a new input file.
+	 */
+#define YY_BUFFER_EOF_PENDING 2
+
+	};
+#endif /* !YY_STRUCT_YY_BUFFER_STATE */
+
+/* We provide macros for accessing buffer states in case in the
+ * future we want to put the buffer states in a more general
+ * "scanner state".
+ *
+ * Returns the top of the stack, or NULL.
+ */
+#define YY_CURRENT_BUFFER ( yyg->yy_buffer_stack \
+                          ? yyg->yy_buffer_stack[yyg->yy_buffer_stack_top] \
+                          : NULL)
+/* Same as previous macro, but useful when we know that the buffer stack is not
+ * NULL or when we need an lvalue. For internal use only.
+ */
+#define YY_CURRENT_BUFFER_LVALUE yyg->yy_buffer_stack[yyg->yy_buffer_stack_top]
+
+void yyrestart ( FILE *input_file , yyscan_t yyscanner );
+void yy_switch_to_buffer ( YY_BUFFER_STATE new_buffer , yyscan_t yyscanner );
+YY_BUFFER_STATE yy_create_buffer ( FILE *file, int size , yyscan_t yyscanner );
+void yy_delete_buffer ( YY_BUFFER_STATE b , yyscan_t yyscanner );
+void yy_flush_buffer ( YY_BUFFER_STATE b , yyscan_t yyscanner );
+void yypush_buffer_state ( YY_BUFFER_STATE new_buffer , yyscan_t yyscanner );
+void yypop_buffer_state ( yyscan_t yyscanner );
+
+static void yyensure_buffer_stack ( yyscan_t yyscanner );
+static void yy_load_buffer_state ( yyscan_t yyscanner );
+static void yy_init_buffer ( YY_BUFFER_STATE b, FILE *file , yyscan_t yyscanner );
+#define YY_FLUSH_BUFFER yy_flush_buffer( YY_CURRENT_BUFFER , yyscanner)
+
+YY_BUFFER_STATE yy_scan_buffer ( char *base, yy_size_t size , yyscan_t yyscanner );
+YY_BUFFER_STATE yy_scan_string ( const char *yy_str , yyscan_t yyscanner );
+YY_BUFFER_STATE yy_scan_bytes ( const char *bytes, int len , yyscan_t yyscanner );
+
+void *yyalloc ( yy_size_t , yyscan_t yyscanner );
+void *yyrealloc ( void *, yy_size_t , yyscan_t yyscanner );
+void yyfree ( void * , yyscan_t yyscanner );
+
+#define yy_new_buffer yy_create_buffer
+#define yy_set_interactive(is_interactive) \
+	{ \
+	if ( ! YY_CURRENT_BUFFER ){ \
+        yyensure_buffer_stack (yyscanner); \
+		YY_CURRENT_BUFFER_LVALUE =    \
+            yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner); \
+	} \
+	YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
+	}
+#define yy_set_bol(at_bol) \
+	{ \
+	if ( ! YY_CURRENT_BUFFER ){\
+        yyensure_buffer_stack (yyscanner); \
+		YY_CURRENT_BUFFER_LVALUE =    \
+            yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner); \
+	} \
+	YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
+	}
+#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)
+
+/* Begin user sect3 */
+
+#define cmGccDepfile_yywrap(yyscanner) (/*CONSTCOND*/1)
+#define YY_SKIP_YYWRAP
+typedef flex_uint8_t YY_CHAR;
+
+typedef int yy_state_type;
+
+#define yytext_ptr yytext_r
+
+static yy_state_type yy_get_previous_state ( yyscan_t yyscanner );
+static yy_state_type yy_try_NUL_trans ( yy_state_type current_state  , yyscan_t yyscanner);
+static int yy_get_next_buffer ( yyscan_t yyscanner );
+static void yynoreturn yy_fatal_error ( const char* msg , yyscan_t yyscanner );
+
+/* Done after the current pattern has been matched and before the
+ * corresponding action - sets up yytext.
+ */
+#define YY_DO_BEFORE_ACTION \
+	yyg->yytext_ptr = yy_bp; \
+	yyleng = (int) (yy_cp - yy_bp); \
+	yyg->yy_hold_char = *yy_cp; \
+	*yy_cp = '\0'; \
+	yyg->yy_c_buf_p = yy_cp;
+#define YY_NUM_RULES 11
+#define YY_END_OF_BUFFER 12
+/* This struct is not used in this scanner,
+   but its presence is necessary. */
+struct yy_trans_info
+	{
+	flex_int32_t yy_verify;
+	flex_int32_t yy_nxt;
+	};
+static const flex_int16_t yy_accept[26] =
+    {   0,
+        0,    0,   12,   10,    8,    6,   10,    9,   10,   10,
+       10,    8,    0,    6,    9,    1,    7,    5,    0,    3,
+        2,    0,    4,    0,    0
+    } ;
+
+static const YY_CHAR yy_ec[256] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
+        1,    1,    4,    1,    1,    1,    1,    1,    1,    1,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+        1,    5,    6,    1,    7,    8,    6,    1,    1,    6,
+        6,    1,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    9,    1,    1,
+        6,    1,    1,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,   10,    6,    1,    6,    1,    6,    6,    6,    6,
+
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    1,    6,    6,    1,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6,    6,    6,    6,    6,    6,
+        6,    6,    6,    6,    6
+    } ;
+
+static const YY_CHAR yy_meta[11] =
+    {   0,
+        1,    2,    1,    1,    2,    1,    1,    1,    1,    3
+    } ;
+
+static const flex_int16_t yy_base[28] =
+    {   0,
+        0,    0,   29,   35,   18,   35,   22,   18,   15,    0,
+        8,   12,   16,   35,   11,   35,    0,   35,   13,   35,
+       35,   16,   35,   22,   35,   31,   12
+    } ;
+
+static const flex_int16_t yy_def[28] =
+    {   0,
+       25,    1,   25,   25,   26,   25,   25,   25,   25,   27,
+       25,   26,   25,   25,   25,   25,   27,   25,   25,   25,
+       25,   25,   25,   25,    0,   25,   25
+    } ;
+
+static const flex_int16_t yy_nxt[46] =
+    {   0,
+        4,    5,    6,    7,    5,    8,    4,    9,   10,   11,
+       18,   19,   20,   17,   21,   18,   15,   22,   18,   19,
+       23,   13,   16,   15,   14,   24,   20,   13,   25,   25,
+       25,   22,   12,   12,    3,   25,   25,   25,   25,   25,
+       25,   25,   25,   25,   25
+    } ;
+
+static const flex_int16_t yy_chk[46] =
+    {   0,
+        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
+       11,   11,   11,   27,   11,   19,   15,   11,   13,   13,
+       22,   12,    9,    8,    7,   22,   24,    5,    3,    0,
+        0,   24,   26,   26,   25,   25,   25,   25,   25,   25,
+       25,   25,   25,   25,   25
+    } ;
+
+/* The intent behind this definition is that it'll catch
+ * any uses of REJECT which flex missed.
+ */
+#define REJECT reject_used_but_not_detected
+#define yymore() yymore_used_but_not_detected
+#define YY_MORE_ADJ 0
+#define YY_RESTORE_YY_MORE_OFFSET
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+/* IWYU pragma: no_forward_declare yyguts_t */
+
+#ifndef __clang_analyzer__ /* Suppress clang scan-build warnings */
+
+#include <cmGccDepfileLexerHelper.h>
+#include <string>
+
+#define INITIAL 0
+
+#ifndef YY_EXTRA_TYPE
+#define YY_EXTRA_TYPE void *
+#endif
+
+/* Holds the entire state of the reentrant scanner. */
+struct yyguts_t
+    {
+
+    /* User-defined. Not touched by flex. */
+    YY_EXTRA_TYPE yyextra_r;
+
+    /* The rest are the same as the globals declared in the non-reentrant scanner. */
+    FILE *yyin_r, *yyout_r;
+    size_t yy_buffer_stack_top; /**< index of top of stack. */
+    size_t yy_buffer_stack_max; /**< capacity of stack. */
+    YY_BUFFER_STATE * yy_buffer_stack; /**< Stack as an array. */
+    char yy_hold_char;
+    int yy_n_chars;
+    int yyleng_r;
+    char *yy_c_buf_p;
+    int yy_init;
+    int yy_start;
+    int yy_did_buffer_switch_on_eof;
+    int yy_start_stack_ptr;
+    int yy_start_stack_depth;
+    int *yy_start_stack;
+    yy_state_type yy_last_accepting_state;
+    char* yy_last_accepting_cpos;
+
+    int yylineno_r;
+    int yy_flex_debug_r;
+
+    char *yytext_r;
+    int yy_more_flag;
+    int yy_more_len;
+
+    }; /* end struct yyguts_t */
+
+static int yy_init_globals ( yyscan_t yyscanner );
+
+int yylex_init (yyscan_t* scanner);
+
+int yylex_init_extra ( YY_EXTRA_TYPE user_defined, yyscan_t* scanner);
+
+/* Accessor methods to globals.
+   These are made visible to non-reentrant scanners for convenience. */
+
+int yylex_destroy ( yyscan_t yyscanner );
+
+int yyget_debug ( yyscan_t yyscanner );
+
+void yyset_debug ( int debug_flag , yyscan_t yyscanner );
+
+YY_EXTRA_TYPE yyget_extra ( yyscan_t yyscanner );
+
+void yyset_extra ( YY_EXTRA_TYPE user_defined , yyscan_t yyscanner );
+
+FILE *yyget_in ( yyscan_t yyscanner );
+
+void yyset_in  ( FILE * _in_str , yyscan_t yyscanner );
+
+FILE *yyget_out ( yyscan_t yyscanner );
+
+void yyset_out  ( FILE * _out_str , yyscan_t yyscanner );
+
+			int yyget_leng ( yyscan_t yyscanner );
+
+char *yyget_text ( yyscan_t yyscanner );
+
+int yyget_lineno ( yyscan_t yyscanner );
+
+void yyset_lineno ( int _line_number , yyscan_t yyscanner );
+
+int yyget_column  ( yyscan_t yyscanner );
+
+void yyset_column ( int _column_no , yyscan_t yyscanner );
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int yywrap ( yyscan_t yyscanner );
+#else
+extern int yywrap ( yyscan_t yyscanner );
+#endif
+#endif
+
+#ifndef YY_NO_UNPUT
+
+    static void yyunput ( int c, char *buf_ptr  , yyscan_t yyscanner);
+
+#endif
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy ( char *, const char *, int , yyscan_t yyscanner);
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen ( const char * , yyscan_t yyscanner);
+#endif
+
+#ifndef YY_NO_INPUT
+#ifdef __cplusplus
+static int yyinput ( yyscan_t yyscanner );
+#else
+static int input ( yyscan_t yyscanner );
+#endif
+
+#endif
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k */
+#define YY_READ_BUF_SIZE 16384
+#else
+#define YY_READ_BUF_SIZE 8192
+#endif /* __ia64__ */
+#endif
+
+/* Copy whatever the last rule matched to the standard output. */
+#ifndef ECHO
+/* This used to be an fputs(), but since the string might contain NUL's,
+ * we now use fwrite().
+ */
+#define ECHO do { if (fwrite( yytext, (size_t) yyleng, 1, yyout )) {} } while (0)
+#endif
+
+/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
+ * is returned in "result".
+ */
+#ifndef YY_INPUT
+#define YY_INPUT(buf,result,max_size) \
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
+		{ \
+		int c = '*'; \
+		int n; \
+		for ( n = 0; n < max_size && \
+			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
+			buf[n] = (char) c; \
+		if ( c == '\n' ) \
+			buf[n++] = (char) c; \
+		if ( c == EOF && ferror( yyin ) ) \
+			YY_FATAL_ERROR( "input in flex scanner failed" ); \
+		result = n; \
+		} \
+	else \
+		{ \
+		errno=0; \
+		while ( (result = (int) fread(buf, 1, (yy_size_t) max_size, yyin)) == 0 && ferror(yyin)) \
+			{ \
+			if( errno != EINTR) \
+				{ \
+				YY_FATAL_ERROR( "input in flex scanner failed" ); \
+				break; \
+				} \
+			errno=0; \
+			clearerr(yyin); \
+			} \
+		}\
+\
+
+#endif
+
+/* No semi-colon after return; correct usage is to write "yyterminate();" -
+ * we don't want an extra ';' after the "return" because that will cause
+ * some compilers to complain about unreachable statements.
+ */
+#ifndef yyterminate
+#define yyterminate() return YY_NULL
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Report a fatal error. */
+#ifndef YY_FATAL_ERROR
+#define YY_FATAL_ERROR(msg) yy_fatal_error( msg , yyscanner)
+#endif
+
+/* end tables serialization structures and prototypes */
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL_IS_OURS 1
+
+extern int yylex (yyscan_t yyscanner);
+
+#define YY_DECL int yylex (yyscan_t yyscanner)
+#endif /* !YY_DECL */
+
+/* Code executed at the beginning of each rule, after yytext and yyleng
+ * have been set up.
+ */
+#ifndef YY_USER_ACTION
+#define YY_USER_ACTION
+#endif
+
+/* Code executed at the end of each rule. */
+#ifndef YY_BREAK
+#define YY_BREAK /*LINTED*/break;
+#endif
+
+#define YY_RULE_SETUP \
+	YY_USER_ACTION
+
+/** The main scanner function which does all the work.
+ */
+YY_DECL
+{
+	yy_state_type yy_current_state;
+	char *yy_cp, *yy_bp;
+	int yy_act;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	if ( !yyg->yy_init )
+		{
+		yyg->yy_init = 1;
+
+#ifdef YY_USER_INIT
+		YY_USER_INIT;
+#endif
+
+		if ( ! yyg->yy_start )
+			yyg->yy_start = 1;	/* first start state */
+
+		if ( ! yyin )
+			yyin = stdin;
+
+		if ( ! yyout )
+			yyout = stdout;
+
+		if ( ! YY_CURRENT_BUFFER ) {
+			yyensure_buffer_stack (yyscanner);
+			YY_CURRENT_BUFFER_LVALUE =
+				yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner);
+		}
+
+		yy_load_buffer_state( yyscanner );
+		}
+
+	{
+
+	while ( /*CONSTCOND*/1 )		/* loops until end-of-file is reached */
+		{
+		yy_cp = yyg->yy_c_buf_p;
+
+		/* Support of yytext. */
+		*yy_cp = yyg->yy_hold_char;
+
+		/* yy_bp points to the position in yy_ch_buf of the start of
+		 * the current run.
+		 */
+		yy_bp = yy_cp;
+
+		yy_current_state = yyg->yy_start;
+yy_match:
+		do
+			{
+			YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)] ;
+			if ( yy_accept[yy_current_state] )
+				{
+				yyg->yy_last_accepting_state = yy_current_state;
+				yyg->yy_last_accepting_cpos = yy_cp;
+				}
+			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+				{
+				yy_current_state = (int) yy_def[yy_current_state];
+				if ( yy_current_state >= 26 )
+					yy_c = yy_meta[yy_c];
+				}
+			yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
+			++yy_cp;
+			}
+		while ( yy_base[yy_current_state] != 35 );
+
+yy_find_action:
+		yy_act = yy_accept[yy_current_state];
+		if ( yy_act == 0 )
+			{ /* have to back up */
+			yy_cp = yyg->yy_last_accepting_cpos;
+			yy_current_state = yyg->yy_last_accepting_state;
+			yy_act = yy_accept[yy_current_state];
+			}
+
+		YY_DO_BEFORE_ACTION;
+
+do_action:	/* This label is used only to access EOF actions. */
+
+		switch ( yy_act )
+	{ /* beginning of action switch */
+			case 0: /* must back up */
+			/* undo the effects of YY_DO_BEFORE_ACTION */
+			*yy_cp = yyg->yy_hold_char;
+			yy_cp = yyg->yy_last_accepting_cpos;
+			yy_current_state = yyg->yy_last_accepting_state;
+			goto yy_find_action;
+
+case 1:
+YY_RULE_SETUP
+{
+                         // Unescape the dollar sign.
+                         yyextra->addToCurrentPath("$");
+                       }
+	YY_BREAK
+case 2:
+YY_RULE_SETUP
+{
+                         // Unescape the hash.
+                         yyextra->addToCurrentPath("#");
+                       }
+	YY_BREAK
+case 3:
+YY_RULE_SETUP
+{
+                         // 2N+1 backslashes plus space -> N backslashes plus space.
+                         size_t c = (strlen(yytext) - 1) / 2;
+                         std::string s(c, '\\');
+                         s.push_back(' ');
+                         yyextra->addToCurrentPath(s.c_str());
+                       }
+	YY_BREAK
+case 4:
+YY_RULE_SETUP
+{
+                         // 2N backslashes plus space -> 2N backslashes, end of filename.
+                         yytext[strlen(yytext) - 1] = 0;
+                         yyextra->addToCurrentPath(yytext);
+                         yyextra->newDependency();
+                       }
+	YY_BREAK
+case 5:
+/* rule 5 can match eol */
+YY_RULE_SETUP
+{
+                         // A line continuation ends the current file name.
+                         yyextra->newDependency();
+                       }
+	YY_BREAK
+case 6:
+/* rule 6 can match eol */
+YY_RULE_SETUP
+{
+                         // A newline ends the current file name and the current rule.
+                         yyextra->newEntry();
+                       }
+	YY_BREAK
+case 7:
+YY_RULE_SETUP
+{
+                         // A colon followed by space ends the rules and starts a new dependency.
+                         yyextra->newDependency();
+                       }
+	YY_BREAK
+case 8:
+YY_RULE_SETUP
+{
+                         // Rules and dependencies are separated by blocks of whitespace.
+                         yyextra->newRuleOrDependency();
+                       }
+	YY_BREAK
+case 9:
+YY_RULE_SETUP
+{
+                         // Got a span of plain text.
+                         yyextra->addToCurrentPath(yytext);
+                       }
+	YY_BREAK
+case 10:
+YY_RULE_SETUP
+{
+                         // Got an otherwise unmatched character.
+                         yyextra->addToCurrentPath(yytext);
+                       }
+	YY_BREAK
+case 11:
+YY_RULE_SETUP
+ECHO;
+	YY_BREAK
+case YY_STATE_EOF(INITIAL):
+	yyterminate();
+
+	case YY_END_OF_BUFFER:
+		{
+		/* Amount of text matched not including the EOB char. */
+		int yy_amount_of_matched_text = (int) (yy_cp - yyg->yytext_ptr) - 1;
+
+		/* Undo the effects of YY_DO_BEFORE_ACTION. */
+		*yy_cp = yyg->yy_hold_char;
+		YY_RESTORE_YY_MORE_OFFSET
+
+		if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
+			{
+			/* We're scanning a new file or input source.  It's
+			 * possible that this happened because the user
+			 * just pointed yyin at a new source and called
+			 * yylex().  If so, then we have to assure
+			 * consistency between YY_CURRENT_BUFFER and our
+			 * globals.  Here is the right place to do so, because
+			 * this is the first action (other than possibly a
+			 * back-up) that will match for the new input source.
+			 */
+			yyg->yy_n_chars = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+			YY_CURRENT_BUFFER_LVALUE->yy_input_file = yyin;
+			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
+			}
+
+		/* Note that here we test for yy_c_buf_p "<=" to the position
+		 * of the first EOB in the buffer, since yy_c_buf_p will
+		 * already have been incremented past the NUL character
+		 * (since all states make transitions on EOB to the
+		 * end-of-buffer state).  Contrast this with the test
+		 * in input().
+		 */
+		if ( yyg->yy_c_buf_p <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] )
+			{ /* This was really a NUL. */
+			yy_state_type yy_next_state;
+
+			yyg->yy_c_buf_p = yyg->yytext_ptr + yy_amount_of_matched_text;
+
+			yy_current_state = yy_get_previous_state( yyscanner );
+
+			/* Okay, we're now positioned to make the NUL
+			 * transition.  We couldn't have
+			 * yy_get_previous_state() go ahead and do it
+			 * for us because it doesn't know how to deal
+			 * with the possibility of jamming (and we don't
+			 * want to build jamming into it because then it
+			 * will run more slowly).
+			 */
+
+			yy_next_state = yy_try_NUL_trans( yy_current_state , yyscanner);
+
+			yy_bp = yyg->yytext_ptr + YY_MORE_ADJ;
+
+			if ( yy_next_state )
+				{
+				/* Consume the NUL. */
+				yy_cp = ++yyg->yy_c_buf_p;
+				yy_current_state = yy_next_state;
+				goto yy_match;
+				}
+
+			else
+				{
+				yy_cp = yyg->yy_c_buf_p;
+				goto yy_find_action;
+				}
+			}
+
+		else switch ( yy_get_next_buffer( yyscanner ) )
+			{
+			case EOB_ACT_END_OF_FILE:
+				{
+				yyg->yy_did_buffer_switch_on_eof = 0;
+
+				if ( yywrap( yyscanner ) )
+					{
+					/* Note: because we've taken care in
+					 * yy_get_next_buffer() to have set up
+					 * yytext, we can now set up
+					 * yy_c_buf_p so that if some total
+					 * hoser (like flex itself) wants to
+					 * call the scanner after we return the
+					 * YY_NULL, it'll still work - another
+					 * YY_NULL will get returned.
+					 */
+					yyg->yy_c_buf_p = yyg->yytext_ptr + YY_MORE_ADJ;
+
+					yy_act = YY_STATE_EOF(YY_START);
+					goto do_action;
+					}
+
+				else
+					{
+					if ( ! yyg->yy_did_buffer_switch_on_eof )
+						YY_NEW_FILE;
+					}
+				break;
+				}
+
+			case EOB_ACT_CONTINUE_SCAN:
+				yyg->yy_c_buf_p =
+					yyg->yytext_ptr + yy_amount_of_matched_text;
+
+				yy_current_state = yy_get_previous_state( yyscanner );
+
+				yy_cp = yyg->yy_c_buf_p;
+				yy_bp = yyg->yytext_ptr + YY_MORE_ADJ;
+				goto yy_match;
+
+			case EOB_ACT_LAST_MATCH:
+				yyg->yy_c_buf_p =
+				&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars];
+
+				yy_current_state = yy_get_previous_state( yyscanner );
+
+				yy_cp = yyg->yy_c_buf_p;
+				yy_bp = yyg->yytext_ptr + YY_MORE_ADJ;
+				goto yy_find_action;
+			}
+		break;
+		}
+
+	default:
+		YY_FATAL_ERROR(
+			"fatal flex scanner internal error--no action found" );
+	} /* end of action switch */
+		} /* end of scanning one token */
+	} /* end of user's declarations */
+} /* end of yylex */
+
+/* yy_get_next_buffer - try to read in a new buffer
+ *
+ * Returns a code representing an action:
+ *	EOB_ACT_LAST_MATCH -
+ *	EOB_ACT_CONTINUE_SCAN - continue scanning from current position
+ *	EOB_ACT_END_OF_FILE - end of file
+ */
+static int yy_get_next_buffer (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf;
+	char *source = yyg->yytext_ptr;
+	int number_to_move, i;
+	int ret_val;
+
+	if ( yyg->yy_c_buf_p > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars + 1] )
+		YY_FATAL_ERROR(
+		"fatal flex scanner internal error--end of buffer missed" );
+
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 )
+		{ /* Don't try to fill the buffer, so this is an EOF. */
+		if ( yyg->yy_c_buf_p - yyg->yytext_ptr - YY_MORE_ADJ == 1 )
+			{
+			/* We matched a single character, the EOB, so
+			 * treat this as a final EOF.
+			 */
+			return EOB_ACT_END_OF_FILE;
+			}
+
+		else
+			{
+			/* We matched some text prior to the EOB, first
+			 * process it.
+			 */
+			return EOB_ACT_LAST_MATCH;
+			}
+		}
+
+	/* Try to read more data. */
+
+	/* First move last chars to start of buffer. */
+	number_to_move = (int) (yyg->yy_c_buf_p - yyg->yytext_ptr - 1);
+
+	for ( i = 0; i < number_to_move; ++i )
+		*(dest++) = *(source++);
+
+	if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING )
+		/* don't do the read, it's not guaranteed to return an EOF,
+		 * just force an EOF
+		 */
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars = 0;
+
+	else
+		{
+			int num_to_read =
+			YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1;
+
+		while ( num_to_read <= 0 )
+			{ /* Not enough room in the buffer - grow it. */
+
+			/* just a shorter name for the current buffer */
+			YY_BUFFER_STATE b = YY_CURRENT_BUFFER_LVALUE;
+
+			int yy_c_buf_p_offset =
+				(int) (yyg->yy_c_buf_p - b->yy_ch_buf);
+
+			if ( b->yy_is_our_buffer )
+				{
+				int new_size = b->yy_buf_size * 2;
+
+				if ( new_size <= 0 )
+					b->yy_buf_size += b->yy_buf_size / 8;
+				else
+					b->yy_buf_size *= 2;
+
+				b->yy_ch_buf = (char *)
+					/* Include room in for 2 EOB chars. */
+					yyrealloc( (void *) b->yy_ch_buf,
+							 (yy_size_t) (b->yy_buf_size + 2) , yyscanner );
+				}
+			else
+				/* Can't grow it, we don't own it. */
+				b->yy_ch_buf = NULL;
+
+			if ( ! b->yy_ch_buf )
+				YY_FATAL_ERROR(
+				"fatal error - scanner input buffer overflow" );
+
+			yyg->yy_c_buf_p = &b->yy_ch_buf[yy_c_buf_p_offset];
+
+			num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size -
+						number_to_move - 1;
+
+			}
+
+		if ( num_to_read > YY_READ_BUF_SIZE )
+			num_to_read = YY_READ_BUF_SIZE;
+
+		/* Read in more data. */
+		YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]),
+			yyg->yy_n_chars, num_to_read );
+
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars;
+		}
+
+	if ( yyg->yy_n_chars == 0 )
+		{
+		if ( number_to_move == YY_MORE_ADJ )
+			{
+			ret_val = EOB_ACT_END_OF_FILE;
+			yyrestart( yyin  , yyscanner);
+			}
+
+		else
+			{
+			ret_val = EOB_ACT_LAST_MATCH;
+			YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =
+				YY_BUFFER_EOF_PENDING;
+			}
+		}
+
+	else
+		ret_val = EOB_ACT_CONTINUE_SCAN;
+
+	if ((yyg->yy_n_chars + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) {
+		/* Extend the array by 50%, plus the number we really need. */
+		int new_size = yyg->yy_n_chars + number_to_move + (yyg->yy_n_chars >> 1);
+		YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) yyrealloc(
+			(void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf, (yy_size_t) new_size , yyscanner );
+		if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
+			YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" );
+		/* "- 2" to take care of EOB's */
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_size = (int) (new_size - 2);
+	}
+
+	yyg->yy_n_chars += number_to_move;
+	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] = YY_END_OF_BUFFER_CHAR;
+	YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;
+
+	yyg->yytext_ptr = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0];
+
+	return ret_val;
+}
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+    static yy_state_type yy_get_previous_state (yyscan_t yyscanner)
+{
+	yy_state_type yy_current_state;
+	char *yy_cp;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	yy_current_state = yyg->yy_start;
+
+	for ( yy_cp = yyg->yytext_ptr + YY_MORE_ADJ; yy_cp < yyg->yy_c_buf_p; ++yy_cp )
+		{
+		YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
+		if ( yy_accept[yy_current_state] )
+			{
+			yyg->yy_last_accepting_state = yy_current_state;
+			yyg->yy_last_accepting_cpos = yy_cp;
+			}
+		while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+			{
+			yy_current_state = (int) yy_def[yy_current_state];
+			if ( yy_current_state >= 26 )
+				yy_c = yy_meta[yy_c];
+			}
+		yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
+		}
+
+	return yy_current_state;
+}
+
+/* yy_try_NUL_trans - try to make a transition on the NUL character
+ *
+ * synopsis
+ *	next_state = yy_try_NUL_trans( current_state );
+ */
+    static yy_state_type yy_try_NUL_trans  (yy_state_type yy_current_state , yyscan_t yyscanner)
+{
+	int yy_is_jam;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; /* This var may be unused depending upon options. */
+	char *yy_cp = yyg->yy_c_buf_p;
+
+	YY_CHAR yy_c = 1;
+	if ( yy_accept[yy_current_state] )
+		{
+		yyg->yy_last_accepting_state = yy_current_state;
+		yyg->yy_last_accepting_cpos = yy_cp;
+		}
+	while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+		{
+		yy_current_state = (int) yy_def[yy_current_state];
+		if ( yy_current_state >= 26 )
+			yy_c = yy_meta[yy_c];
+		}
+	yy_current_state = yy_nxt[yy_base[yy_current_state] + yy_c];
+	yy_is_jam = (yy_current_state == 25);
+
+	(void)yyg;
+	return yy_is_jam ? 0 : yy_current_state;
+}
+
+#ifndef YY_NO_UNPUT
+
+    static void yyunput (int c, char * yy_bp , yyscan_t yyscanner)
+{
+	char *yy_cp;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+    yy_cp = yyg->yy_c_buf_p;
+
+	/* undo effects of setting up yytext */
+	*yy_cp = yyg->yy_hold_char;
+
+	if ( yy_cp < YY_CURRENT_BUFFER_LVALUE->yy_ch_buf + 2 )
+		{ /* need to shift things up to make room */
+		/* +2 for EOB chars. */
+		int number_to_move = yyg->yy_n_chars + 2;
+		char *dest = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[
+					YY_CURRENT_BUFFER_LVALUE->yy_buf_size + 2];
+		char *source =
+				&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move];
+
+		while ( source > YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
+			*--dest = *--source;
+
+		yy_cp += (int) (dest - source);
+		yy_bp += (int) (dest - source);
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars =
+			yyg->yy_n_chars = (int) YY_CURRENT_BUFFER_LVALUE->yy_buf_size;
+
+		if ( yy_cp < YY_CURRENT_BUFFER_LVALUE->yy_ch_buf + 2 )
+			YY_FATAL_ERROR( "flex scanner push-back overflow" );
+		}
+
+	*--yy_cp = (char) c;
+
+	yyg->yytext_ptr = yy_bp;
+	yyg->yy_hold_char = *yy_cp;
+	yyg->yy_c_buf_p = yy_cp;
+}
+
+#endif
+
+#ifndef YY_NO_INPUT
+#ifdef __cplusplus
+    static int yyinput (yyscan_t yyscanner)
+#else
+    static int input  (yyscan_t yyscanner)
+#endif
+
+{
+	int c;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	*yyg->yy_c_buf_p = yyg->yy_hold_char;
+
+	if ( *yyg->yy_c_buf_p == YY_END_OF_BUFFER_CHAR )
+		{
+		/* yy_c_buf_p now points to the character we want to return.
+		 * If this occurs *before* the EOB characters, then it's a
+		 * valid NUL; if not, then we've hit the end of the buffer.
+		 */
+		if ( yyg->yy_c_buf_p < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[yyg->yy_n_chars] )
+			/* This was really a NUL. */
+			*yyg->yy_c_buf_p = '\0';
+
+		else
+			{ /* need more input */
+			int offset = (int) (yyg->yy_c_buf_p - yyg->yytext_ptr);
+			++yyg->yy_c_buf_p;
+
+			switch ( yy_get_next_buffer( yyscanner ) )
+				{
+				case EOB_ACT_LAST_MATCH:
+					/* This happens because yy_g_n_b()
+					 * sees that we've accumulated a
+					 * token and flags that we need to
+					 * try matching the token before
+					 * proceeding.  But for input(),
+					 * there's no matching to consider.
+					 * So convert the EOB_ACT_LAST_MATCH
+					 * to EOB_ACT_END_OF_FILE.
+					 */
+
+					/* Reset buffer status. */
+					yyrestart( yyin , yyscanner);
+
+					/*FALLTHROUGH*/
+
+				case EOB_ACT_END_OF_FILE:
+					{
+					if ( yywrap( yyscanner ) )
+						return 0;
+
+					if ( ! yyg->yy_did_buffer_switch_on_eof )
+						YY_NEW_FILE;
+#ifdef __cplusplus
+					return yyinput(yyscanner);
+#else
+					return input(yyscanner);
+#endif
+					}
+
+				case EOB_ACT_CONTINUE_SCAN:
+					yyg->yy_c_buf_p = yyg->yytext_ptr + offset;
+					break;
+				}
+			}
+		}
+
+	c = *(unsigned char *) yyg->yy_c_buf_p;	/* cast for 8-bit char's */
+	*yyg->yy_c_buf_p = '\0';	/* preserve yytext */
+	yyg->yy_hold_char = *++yyg->yy_c_buf_p;
+
+	return c;
+}
+#endif	/* ifndef YY_NO_INPUT */
+
+/** Immediately switch to a different input stream.
+ * @param input_file A readable stream.
+ * @param yyscanner The scanner object.
+ * @note This function does not reset the start condition to @c INITIAL .
+ */
+    void yyrestart  (FILE * input_file , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	if ( ! YY_CURRENT_BUFFER ){
+        yyensure_buffer_stack (yyscanner);
+		YY_CURRENT_BUFFER_LVALUE =
+            yy_create_buffer( yyin, YY_BUF_SIZE , yyscanner);
+	}
+
+	yy_init_buffer( YY_CURRENT_BUFFER, input_file , yyscanner);
+	yy_load_buffer_state( yyscanner );
+}
+
+/** Switch to a different input buffer.
+ * @param new_buffer The new input buffer.
+ * @param yyscanner The scanner object.
+ */
+    void yy_switch_to_buffer  (YY_BUFFER_STATE  new_buffer , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	/* TODO. We should be able to replace this entire function body
+	 * with
+	 *		yypop_buffer_state();
+	 *		yypush_buffer_state(new_buffer);
+     */
+	yyensure_buffer_stack (yyscanner);
+	if ( YY_CURRENT_BUFFER == new_buffer )
+		return;
+
+	if ( YY_CURRENT_BUFFER )
+		{
+		/* Flush out information for old buffer. */
+		*yyg->yy_c_buf_p = yyg->yy_hold_char;
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = yyg->yy_c_buf_p;
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars;
+		}
+
+	YY_CURRENT_BUFFER_LVALUE = new_buffer;
+	yy_load_buffer_state( yyscanner );
+
+	/* We don't actually know whether we did this switch during
+	 * EOF (yywrap()) processing, but the only time this flag
+	 * is looked at is after yywrap() is called, so it's safe
+	 * to go ahead and always set it.
+	 */
+	yyg->yy_did_buffer_switch_on_eof = 1;
+}
+
+static void yy_load_buffer_state  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	yyg->yy_n_chars = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
+	yyg->yytext_ptr = yyg->yy_c_buf_p = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos;
+	yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file;
+	yyg->yy_hold_char = *yyg->yy_c_buf_p;
+}
+
+/** Allocate and initialize an input buffer state.
+ * @param file A readable stream.
+ * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE.
+ * @param yyscanner The scanner object.
+ * @return the allocated buffer state.
+ */
+    YY_BUFFER_STATE yy_create_buffer  (FILE * file, int  size , yyscan_t yyscanner)
+{
+	YY_BUFFER_STATE b;
+
+	b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state ) , yyscanner );
+	if ( ! b )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+	b->yy_buf_size = size;
+
+	/* yy_ch_buf has to be 2 characters longer than the size given because
+	 * we need to put in 2 end-of-buffer characters.
+	 */
+	b->yy_ch_buf = (char *) yyalloc( (yy_size_t) (b->yy_buf_size + 2) , yyscanner );
+	if ( ! b->yy_ch_buf )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+	b->yy_is_our_buffer = 1;
+
+	yy_init_buffer( b, file , yyscanner);
+
+	return b;
+}
+
+/** Destroy the buffer.
+ * @param b a buffer created with yy_create_buffer()
+ * @param yyscanner The scanner object.
+ */
+    void yy_delete_buffer (YY_BUFFER_STATE  b , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	if ( ! b )
+		return;
+
+	if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */
+		YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0;
+
+	if ( b->yy_is_our_buffer )
+		yyfree( (void *) b->yy_ch_buf , yyscanner );
+
+	yyfree( (void *) b , yyscanner );
+}
+
+/* Initializes or reinitializes a buffer.
+ * This function is sometimes called more than once on the same buffer,
+ * such as during a yyrestart() or at EOF.
+ */
+    static void yy_init_buffer  (YY_BUFFER_STATE  b, FILE * file , yyscan_t yyscanner)
+
+{
+	int oerrno = errno;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	yy_flush_buffer( b , yyscanner);
+
+	b->yy_input_file = file;
+	b->yy_fill_buffer = 1;
+
+    /* If b is the current buffer, then yy_init_buffer was _probably_
+     * called from yyrestart() or through yy_get_next_buffer.
+     * In that case, we don't want to reset the lineno or column.
+     */
+    if (b != YY_CURRENT_BUFFER){
+        b->yy_bs_lineno = 1;
+        b->yy_bs_column = 0;
+    }
+
+        b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
+
+	errno = oerrno;
+}
+
+/** Discard all buffered characters. On the next scan, YY_INPUT will be called.
+ * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER.
+ * @param yyscanner The scanner object.
+ */
+    void yy_flush_buffer (YY_BUFFER_STATE  b , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	if ( ! b )
+		return;
+
+	b->yy_n_chars = 0;
+
+	/* We always need two end-of-buffer characters.  The first causes
+	 * a transition to the end-of-buffer state.  The second causes
+	 * a jam in that state.
+	 */
+	b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
+	b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;
+
+	b->yy_buf_pos = &b->yy_ch_buf[0];
+
+	b->yy_at_bol = 1;
+	b->yy_buffer_status = YY_BUFFER_NEW;
+
+	if ( b == YY_CURRENT_BUFFER )
+		yy_load_buffer_state( yyscanner );
+}
+
+/** Pushes the new state onto the stack. The new state becomes
+ *  the current state. This function will allocate the stack
+ *  if necessary.
+ *  @param new_buffer The new state.
+ *  @param yyscanner The scanner object.
+ */
+void yypush_buffer_state (YY_BUFFER_STATE new_buffer , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	if (new_buffer == NULL)
+		return;
+
+	yyensure_buffer_stack(yyscanner);
+
+	/* This block is copied from yy_switch_to_buffer. */
+	if ( YY_CURRENT_BUFFER )
+		{
+		/* Flush out information for old buffer. */
+		*yyg->yy_c_buf_p = yyg->yy_hold_char;
+		YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = yyg->yy_c_buf_p;
+		YY_CURRENT_BUFFER_LVALUE->yy_n_chars = yyg->yy_n_chars;
+		}
+
+	/* Only push if top exists. Otherwise, replace top. */
+	if (YY_CURRENT_BUFFER)
+		yyg->yy_buffer_stack_top++;
+	YY_CURRENT_BUFFER_LVALUE = new_buffer;
+
+	/* copied from yy_switch_to_buffer. */
+	yy_load_buffer_state( yyscanner );
+	yyg->yy_did_buffer_switch_on_eof = 1;
+}
+
+/** Removes and deletes the top of the stack, if present.
+ *  The next element becomes the new top.
+ *  @param yyscanner The scanner object.
+ */
+void yypop_buffer_state (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	if (!YY_CURRENT_BUFFER)
+		return;
+
+	yy_delete_buffer(YY_CURRENT_BUFFER , yyscanner);
+	YY_CURRENT_BUFFER_LVALUE = NULL;
+	if (yyg->yy_buffer_stack_top > 0)
+		--yyg->yy_buffer_stack_top;
+
+	if (YY_CURRENT_BUFFER) {
+		yy_load_buffer_state( yyscanner );
+		yyg->yy_did_buffer_switch_on_eof = 1;
+	}
+}
+
+/* Allocates the stack if it does not exist.
+ *  Guarantees space for at least one push.
+ */
+static void yyensure_buffer_stack (yyscan_t yyscanner)
+{
+	yy_size_t num_to_alloc;
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+	if (!yyg->yy_buffer_stack) {
+
+		/* First allocation is just for 2 elements, since we don't know if this
+		 * scanner will even need a stack. We use 2 instead of 1 to avoid an
+		 * immediate realloc on the next call.
+         */
+      num_to_alloc = 1; /* After all that talk, this was set to 1 anyways... */
+		yyg->yy_buffer_stack = (struct yy_buffer_state**)yyalloc
+								(num_to_alloc * sizeof(struct yy_buffer_state*)
+								, yyscanner);
+		if ( ! yyg->yy_buffer_stack )
+			YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" );
+
+		memset(yyg->yy_buffer_stack, 0, num_to_alloc * sizeof(struct yy_buffer_state*));
+
+		yyg->yy_buffer_stack_max = num_to_alloc;
+		yyg->yy_buffer_stack_top = 0;
+		return;
+	}
+
+	if (yyg->yy_buffer_stack_top >= (yyg->yy_buffer_stack_max) - 1){
+
+		/* Increase the buffer to prepare for a possible push. */
+		yy_size_t grow_size = 8 /* arbitrary grow size */;
+
+		num_to_alloc = yyg->yy_buffer_stack_max + grow_size;
+		yyg->yy_buffer_stack = (struct yy_buffer_state**)yyrealloc
+								(yyg->yy_buffer_stack,
+								num_to_alloc * sizeof(struct yy_buffer_state*)
+								, yyscanner);
+		if ( ! yyg->yy_buffer_stack )
+			YY_FATAL_ERROR( "out of dynamic memory in yyensure_buffer_stack()" );
+
+		/* zero only the new slots.*/
+		memset(yyg->yy_buffer_stack + yyg->yy_buffer_stack_max, 0, grow_size * sizeof(struct yy_buffer_state*));
+		yyg->yy_buffer_stack_max = num_to_alloc;
+	}
+}
+
+/** Setup the input buffer state to scan directly from a user-specified character buffer.
+ * @param base the character buffer
+ * @param size the size in bytes of the character buffer
+ * @param yyscanner The scanner object.
+ * @return the newly allocated buffer state object.
+ */
+YY_BUFFER_STATE yy_scan_buffer  (char * base, yy_size_t  size , yyscan_t yyscanner)
+{
+	YY_BUFFER_STATE b;
+
+	if ( size < 2 ||
+	     base[size-2] != YY_END_OF_BUFFER_CHAR ||
+	     base[size-1] != YY_END_OF_BUFFER_CHAR )
+		/* They forgot to leave room for the EOB's. */
+		return NULL;
+
+	b = (YY_BUFFER_STATE) yyalloc( sizeof( struct yy_buffer_state ) , yyscanner );
+	if ( ! b )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_scan_buffer()" );
+
+	b->yy_buf_size = (int) (size - 2);	/* "- 2" to take care of EOB's */
+	b->yy_buf_pos = b->yy_ch_buf = base;
+	b->yy_is_our_buffer = 0;
+	b->yy_input_file = NULL;
+	b->yy_n_chars = b->yy_buf_size;
+	b->yy_is_interactive = 0;
+	b->yy_at_bol = 1;
+	b->yy_fill_buffer = 0;
+	b->yy_buffer_status = YY_BUFFER_NEW;
+
+	yy_switch_to_buffer( b , yyscanner );
+
+	return b;
+}
+
+/** Setup the input buffer state to scan a string. The next call to yylex() will
+ * scan from a @e copy of @a str.
+ * @param yystr a NUL-terminated string to scan
+ * @param yyscanner The scanner object.
+ * @return the newly allocated buffer state object.
+ * @note If you want to scan bytes that may contain NUL values, then use
+ *       yy_scan_bytes() instead.
+ */
+YY_BUFFER_STATE yy_scan_string (const char * yystr , yyscan_t yyscanner)
+{
+
+	return yy_scan_bytes( yystr, (int) strlen(yystr) , yyscanner);
+}
+
+/** Setup the input buffer state to scan the given bytes. The next call to yylex() will
+ * scan from a @e copy of @a bytes.
+ * @param yybytes the byte buffer to scan
+ * @param _yybytes_len the number of bytes in the buffer pointed to by @a bytes.
+ * @param yyscanner The scanner object.
+ * @return the newly allocated buffer state object.
+ */
+YY_BUFFER_STATE yy_scan_bytes  (const char * yybytes, int  _yybytes_len , yyscan_t yyscanner)
+{
+	YY_BUFFER_STATE b;
+	char *buf;
+	yy_size_t n;
+	int i;
+
+	/* Get memory for full buffer, including space for trailing EOB's. */
+	n = (yy_size_t) (_yybytes_len + 2);
+	buf = (char *) yyalloc( n , yyscanner );
+	if ( ! buf )
+		YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" );
+
+	for ( i = 0; i < _yybytes_len; ++i )
+		buf[i] = yybytes[i];
+
+	buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR;
+
+	b = yy_scan_buffer( buf, n , yyscanner);
+	if ( ! b )
+		YY_FATAL_ERROR( "bad buffer in yy_scan_bytes()" );
+
+	/* It's okay to grow etc. this buffer, and we should throw it
+	 * away when we're done.
+	 */
+	b->yy_is_our_buffer = 1;
+
+	return b;
+}
+
+#ifndef YY_EXIT_FAILURE
+#define YY_EXIT_FAILURE 2
+#endif
+
+static void yynoreturn yy_fatal_error (const char* msg , yyscan_t yyscanner)
+{
+	struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	(void)yyg;
+	fprintf( stderr, "%s\n", msg );
+	exit( YY_EXIT_FAILURE );
+}
+
+/* Redefine yyless() so it works in section 3 code. */
+
+#undef yyless
+#define yyless(n) \
+	do \
+		{ \
+		/* Undo effects of setting up yytext. */ \
+        int yyless_macro_arg = (n); \
+        YY_LESS_LINENO(yyless_macro_arg);\
+		yytext[yyleng] = yyg->yy_hold_char; \
+		yyg->yy_c_buf_p = yytext + yyless_macro_arg; \
+		yyg->yy_hold_char = *yyg->yy_c_buf_p; \
+		*yyg->yy_c_buf_p = '\0'; \
+		yyleng = yyless_macro_arg; \
+		} \
+	while ( 0 )
+
+/* Accessor  methods (get/set functions) to struct members. */
+
+/** Get the user-defined data for this scanner.
+ * @param yyscanner The scanner object.
+ */
+YY_EXTRA_TYPE yyget_extra  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyextra;
+}
+
+/** Get the current line number.
+ * @param yyscanner The scanner object.
+ */
+int yyget_lineno  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+        if (! YY_CURRENT_BUFFER)
+            return 0;
+
+    return yylineno;
+}
+
+/** Get the current column number.
+ * @param yyscanner The scanner object.
+ */
+int yyget_column  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+        if (! YY_CURRENT_BUFFER)
+            return 0;
+
+    return yycolumn;
+}
+
+/** Get the input stream.
+ * @param yyscanner The scanner object.
+ */
+FILE *yyget_in  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyin;
+}
+
+/** Get the output stream.
+ * @param yyscanner The scanner object.
+ */
+FILE *yyget_out  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyout;
+}
+
+/** Get the length of the current token.
+ * @param yyscanner The scanner object.
+ */
+int yyget_leng  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yyleng;
+}
+
+/** Get the current token.
+ * @param yyscanner The scanner object.
+ */
+
+char *yyget_text  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yytext;
+}
+
+/** Set the user-defined data. This data is never touched by the scanner.
+ * @param user_defined The data to be associated with this scanner.
+ * @param yyscanner The scanner object.
+ */
+void yyset_extra (YY_EXTRA_TYPE  user_defined , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yyextra = user_defined ;
+}
+
+/** Set the current line number.
+ * @param _line_number line number
+ * @param yyscanner The scanner object.
+ */
+void yyset_lineno (int  _line_number , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+        /* lineno is only valid if an input buffer exists. */
+        if (! YY_CURRENT_BUFFER )
+           YY_FATAL_ERROR( "yyset_lineno called with no buffer" );
+
+    yylineno = _line_number;
+}
+
+/** Set the current column.
+ * @param _column_no column number
+ * @param yyscanner The scanner object.
+ */
+void yyset_column (int  _column_no , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+        /* column is only valid if an input buffer exists. */
+        if (! YY_CURRENT_BUFFER )
+           YY_FATAL_ERROR( "yyset_column called with no buffer" );
+
+    yycolumn = _column_no;
+}
+
+/** Set the input stream. This does not discard the current
+ * input buffer.
+ * @param _in_str A readable stream.
+ * @param yyscanner The scanner object.
+ * @see yy_switch_to_buffer
+ */
+void yyset_in (FILE *  _in_str , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yyin = _in_str ;
+}
+
+void yyset_out (FILE *  _out_str , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yyout = _out_str ;
+}
+
+int yyget_debug  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    return yy_flex_debug;
+}
+
+void yyset_debug (int  _bdebug , yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    yy_flex_debug = _bdebug ;
+}
+
+/* Accessor methods for yylval and yylloc */
+
+/* User-visible API */
+
+/* yylex_init is special because it creates the scanner itself, so it is
+ * the ONLY reentrant function that doesn't take the scanner as the last argument.
+ * That's why we explicitly handle the declaration, instead of using our macros.
+ */
+int yylex_init(yyscan_t* ptr_yy_globals)
+{
+    if (ptr_yy_globals == NULL){
+        errno = EINVAL;
+        return 1;
+    }
+
+    *ptr_yy_globals = (yyscan_t) yyalloc ( sizeof( struct yyguts_t ), NULL );
+
+    if (*ptr_yy_globals == NULL){
+        errno = ENOMEM;
+        return 1;
+    }
+
+    /* By setting to 0xAA, we expose bugs in yy_init_globals. Leave at 0x00 for releases. */
+    memset(*ptr_yy_globals,0x00,sizeof(struct yyguts_t));
+
+    return yy_init_globals ( *ptr_yy_globals );
+}
+
+/* yylex_init_extra has the same functionality as yylex_init, but follows the
+ * convention of taking the scanner as the last argument. Note however, that
+ * this is a *pointer* to a scanner, as it will be allocated by this call (and
+ * is the reason, too, why this function also must handle its own declaration).
+ * The user defined value in the first argument will be available to yyalloc in
+ * the yyextra field.
+ */
+int yylex_init_extra( YY_EXTRA_TYPE yy_user_defined, yyscan_t* ptr_yy_globals )
+{
+    struct yyguts_t dummy_yyguts;
+
+    yyset_extra (yy_user_defined, &dummy_yyguts);
+
+    if (ptr_yy_globals == NULL){
+        errno = EINVAL;
+        return 1;
+    }
+
+    *ptr_yy_globals = (yyscan_t) yyalloc ( sizeof( struct yyguts_t ), &dummy_yyguts );
+
+    if (*ptr_yy_globals == NULL){
+        errno = ENOMEM;
+        return 1;
+    }
+
+    /* By setting to 0xAA, we expose bugs in
+    yy_init_globals. Leave at 0x00 for releases. */
+    memset(*ptr_yy_globals,0x00,sizeof(struct yyguts_t));
+
+    yyset_extra (yy_user_defined, *ptr_yy_globals);
+
+    return yy_init_globals ( *ptr_yy_globals );
+}
+
+static int yy_init_globals (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+    /* Initialization is the same as for the non-reentrant scanner.
+     * This function is called from yylex_destroy(), so don't allocate here.
+     */
+
+    yyg->yy_buffer_stack = NULL;
+    yyg->yy_buffer_stack_top = 0;
+    yyg->yy_buffer_stack_max = 0;
+    yyg->yy_c_buf_p = NULL;
+    yyg->yy_init = 0;
+    yyg->yy_start = 0;
+
+    yyg->yy_start_stack_ptr = 0;
+    yyg->yy_start_stack_depth = 0;
+    yyg->yy_start_stack =  NULL;
+
+/* Defined in main.c */
+#ifdef YY_STDINIT
+    yyin = stdin;
+    yyout = stdout;
+#else
+    yyin = NULL;
+    yyout = NULL;
+#endif
+
+    /* For future reference: Set errno on error, since we are called by
+     * yylex_init()
+     */
+    return 0;
+}
+
+/* yylex_destroy is for both reentrant and non-reentrant scanners. */
+int yylex_destroy  (yyscan_t yyscanner)
+{
+    struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+
+    /* Pop the buffer stack, destroying each element. */
+	while(YY_CURRENT_BUFFER){
+		yy_delete_buffer( YY_CURRENT_BUFFER , yyscanner );
+		YY_CURRENT_BUFFER_LVALUE = NULL;
+		yypop_buffer_state(yyscanner);
+	}
+
+	/* Destroy the stack itself. */
+	yyfree(yyg->yy_buffer_stack , yyscanner);
+	yyg->yy_buffer_stack = NULL;
+
+    /* Destroy the start condition stack. */
+        yyfree( yyg->yy_start_stack , yyscanner );
+        yyg->yy_start_stack = NULL;
+
+    /* Reset the globals. This is important in a non-reentrant scanner so the next time
+     * yylex() is called, initialization will occur. */
+    yy_init_globals( yyscanner);
+
+    /* Destroy the main struct (reentrant only). */
+    yyfree ( yyscanner , yyscanner );
+    yyscanner = NULL;
+    return 0;
+}
+
+/*
+ * Internal utility routines.
+ */
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy (char* s1, const char * s2, int n , yyscan_t yyscanner)
+{
+	struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	(void)yyg;
+
+	int i;
+	for ( i = 0; i < n; ++i )
+		s1[i] = s2[i];
+}
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen (const char * s , yyscan_t yyscanner)
+{
+	int n;
+	for ( n = 0; s[n]; ++n )
+		;
+
+	return n;
+}
+#endif
+
+void *yyalloc (yy_size_t  size , yyscan_t yyscanner)
+{
+	struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	(void)yyg;
+	return malloc(size);
+}
+
+void *yyrealloc  (void * ptr, yy_size_t  size , yyscan_t yyscanner)
+{
+	struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	(void)yyg;
+
+	/* The cast to (char *) in the following accommodates both
+	 * implementations that use char* generic pointers, and those
+	 * that use void* generic pointers.  It works with the latter
+	 * because both ANSI C and C++ allow castless assignment from
+	 * any pointer type to void*, and deal with argument conversions
+	 * as though doing an assignment.
+	 */
+	return realloc(ptr, size);
+}
+
+void yyfree (void * ptr , yyscan_t yyscanner)
+{
+	struct yyguts_t * yyg = (struct yyguts_t*)yyscanner;
+	(void)yyg;
+	free( (char *) ptr );	/* see yyrealloc() for (char *) cast */
+}
+
+#define YYTABLES_NAME "yytables"
+
+/*--------------------------------------------------------------------------*/
+
+#endif /* __clang_analyzer__ */
diff --git a/Source/LexerParser/cmGccDepfileLexer.h b/Source/LexerParser/cmGccDepfileLexer.h
new file mode 100644
index 0000000000..7d34060a10
--- /dev/null
+++ b/Source/LexerParser/cmGccDepfileLexer.h
@@ -0,0 +1,687 @@
+#ifndef cmGccDepfile_yyHEADER_H
+#define cmGccDepfile_yyHEADER_H 1
+#define cmGccDepfile_yyIN_HEADER 1
+
+#define FLEXINT_H 1
+#define  YY_INT_ALIGNED short int
+
+/* A lexical scanner generated by flex */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 6
+#define YY_FLEX_SUBMINOR_VERSION 4
+#if YY_FLEX_SUBMINOR_VERSION > 0
+#define FLEX_BETA
+#endif
+
+#ifdef yy_create_buffer
+#define cmGccDepfile_yy_create_buffer_ALREADY_DEFINED
+#else
+#define yy_create_buffer cmGccDepfile_yy_create_buffer
+#endif
+
+#ifdef yy_delete_buffer
+#define cmGccDepfile_yy_delete_buffer_ALREADY_DEFINED
+#else
+#define yy_delete_buffer cmGccDepfile_yy_delete_buffer
+#endif
+
+#ifdef yy_scan_buffer
+#define cmGccDepfile_yy_scan_buffer_ALREADY_DEFINED
+#else
+#define yy_scan_buffer cmGccDepfile_yy_scan_buffer
+#endif
+
+#ifdef yy_scan_string
+#define cmGccDepfile_yy_scan_string_ALREADY_DEFINED
+#else
+#define yy_scan_string cmGccDepfile_yy_scan_string
+#endif
+
+#ifdef yy_scan_bytes
+#define cmGccDepfile_yy_scan_bytes_ALREADY_DEFINED
+#else
+#define yy_scan_bytes cmGccDepfile_yy_scan_bytes
+#endif
+
+#ifdef yy_init_buffer
+#define cmGccDepfile_yy_init_buffer_ALREADY_DEFINED
+#else
+#define yy_init_buffer cmGccDepfile_yy_init_buffer
+#endif
+
+#ifdef yy_flush_buffer
+#define cmGccDepfile_yy_flush_buffer_ALREADY_DEFINED
+#else
+#define yy_flush_buffer cmGccDepfile_yy_flush_buffer
+#endif
+
+#ifdef yy_load_buffer_state
+#define cmGccDepfile_yy_load_buffer_state_ALREADY_DEFINED
+#else
+#define yy_load_buffer_state cmGccDepfile_yy_load_buffer_state
+#endif
+
+#ifdef yy_switch_to_buffer
+#define cmGccDepfile_yy_switch_to_buffer_ALREADY_DEFINED
+#else
+#define yy_switch_to_buffer cmGccDepfile_yy_switch_to_buffer
+#endif
+
+#ifdef yypush_buffer_state
+#define cmGccDepfile_yypush_buffer_state_ALREADY_DEFINED
+#else
+#define yypush_buffer_state cmGccDepfile_yypush_buffer_state
+#endif
+
+#ifdef yypop_buffer_state
+#define cmGccDepfile_yypop_buffer_state_ALREADY_DEFINED
+#else
+#define yypop_buffer_state cmGccDepfile_yypop_buffer_state
+#endif
+
+#ifdef yyensure_buffer_stack
+#define cmGccDepfile_yyensure_buffer_stack_ALREADY_DEFINED
+#else
+#define yyensure_buffer_stack cmGccDepfile_yyensure_buffer_stack
+#endif
+
+#ifdef yylex
+#define cmGccDepfile_yylex_ALREADY_DEFINED
+#else
+#define yylex cmGccDepfile_yylex
+#endif
+
+#ifdef yyrestart
+#define cmGccDepfile_yyrestart_ALREADY_DEFINED
+#else
+#define yyrestart cmGccDepfile_yyrestart
+#endif
+
+#ifdef yylex_init
+#define cmGccDepfile_yylex_init_ALREADY_DEFINED
+#else
+#define yylex_init cmGccDepfile_yylex_init
+#endif
+
+#ifdef yylex_init_extra
+#define cmGccDepfile_yylex_init_extra_ALREADY_DEFINED
+#else
+#define yylex_init_extra cmGccDepfile_yylex_init_extra
+#endif
+
+#ifdef yylex_destroy
+#define cmGccDepfile_yylex_destroy_ALREADY_DEFINED
+#else
+#define yylex_destroy cmGccDepfile_yylex_destroy
+#endif
+
+#ifdef yyget_debug
+#define cmGccDepfile_yyget_debug_ALREADY_DEFINED
+#else
+#define yyget_debug cmGccDepfile_yyget_debug
+#endif
+
+#ifdef yyset_debug
+#define cmGccDepfile_yyset_debug_ALREADY_DEFINED
+#else
+#define yyset_debug cmGccDepfile_yyset_debug
+#endif
+
+#ifdef yyget_extra
+#define cmGccDepfile_yyget_extra_ALREADY_DEFINED
+#else
+#define yyget_extra cmGccDepfile_yyget_extra
+#endif
+
+#ifdef yyset_extra
+#define cmGccDepfile_yyset_extra_ALREADY_DEFINED
+#else
+#define yyset_extra cmGccDepfile_yyset_extra
+#endif
+
+#ifdef yyget_in
+#define cmGccDepfile_yyget_in_ALREADY_DEFINED
+#else
+#define yyget_in cmGccDepfile_yyget_in
+#endif
+
+#ifdef yyset_in
+#define cmGccDepfile_yyset_in_ALREADY_DEFINED
+#else
+#define yyset_in cmGccDepfile_yyset_in
+#endif
+
+#ifdef yyget_out
+#define cmGccDepfile_yyget_out_ALREADY_DEFINED
+#else
+#define yyget_out cmGccDepfile_yyget_out
+#endif
+
+#ifdef yyset_out
+#define cmGccDepfile_yyset_out_ALREADY_DEFINED
+#else
+#define yyset_out cmGccDepfile_yyset_out
+#endif
+
+#ifdef yyget_leng
+#define cmGccDepfile_yyget_leng_ALREADY_DEFINED
+#else
+#define yyget_leng cmGccDepfile_yyget_leng
+#endif
+
+#ifdef yyget_text
+#define cmGccDepfile_yyget_text_ALREADY_DEFINED
+#else
+#define yyget_text cmGccDepfile_yyget_text
+#endif
+
+#ifdef yyget_lineno
+#define cmGccDepfile_yyget_lineno_ALREADY_DEFINED
+#else
+#define yyget_lineno cmGccDepfile_yyget_lineno
+#endif
+
+#ifdef yyset_lineno
+#define cmGccDepfile_yyset_lineno_ALREADY_DEFINED
+#else
+#define yyset_lineno cmGccDepfile_yyset_lineno
+#endif
+
+#ifdef yyget_column
+#define cmGccDepfile_yyget_column_ALREADY_DEFINED
+#else
+#define yyget_column cmGccDepfile_yyget_column
+#endif
+
+#ifdef yyset_column
+#define cmGccDepfile_yyset_column_ALREADY_DEFINED
+#else
+#define yyset_column cmGccDepfile_yyset_column
+#endif
+
+#ifdef yywrap
+#define cmGccDepfile_yywrap_ALREADY_DEFINED
+#else
+#define yywrap cmGccDepfile_yywrap
+#endif
+
+#ifdef yyalloc
+#define cmGccDepfile_yyalloc_ALREADY_DEFINED
+#else
+#define yyalloc cmGccDepfile_yyalloc
+#endif
+
+#ifdef yyrealloc
+#define cmGccDepfile_yyrealloc_ALREADY_DEFINED
+#else
+#define yyrealloc cmGccDepfile_yyrealloc
+#endif
+
+#ifdef yyfree
+#define cmGccDepfile_yyfree_ALREADY_DEFINED
+#else
+#define yyfree cmGccDepfile_yyfree
+#endif
+
+/* First, we deal with  platform-specific or compiler-specific issues. */
+
+/* begin standard C headers. */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/* end standard C headers. */
+
+/* flex integer type definitions */
+
+#ifndef FLEXINT_H
+#define FLEXINT_H
+
+/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */
+
+#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+
+/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
+ * if you want the limit (max/min) macros for int types.
+ */
+#ifndef __STDC_LIMIT_MACROS
+#define __STDC_LIMIT_MACROS 1
+#endif
+
+#include <inttypes.h>
+typedef int8_t flex_int8_t;
+typedef uint8_t flex_uint8_t;
+typedef int16_t flex_int16_t;
+typedef uint16_t flex_uint16_t;
+typedef int32_t flex_int32_t;
+typedef uint32_t flex_uint32_t;
+#else
+typedef signed char flex_int8_t;
+typedef short int flex_int16_t;
+typedef int flex_int32_t;
+typedef unsigned char flex_uint8_t;
+typedef unsigned short int flex_uint16_t;
+typedef unsigned int flex_uint32_t;
+
+/* Limits of integral types. */
+#ifndef INT8_MIN
+#define INT8_MIN               (-128)
+#endif
+#ifndef INT16_MIN
+#define INT16_MIN              (-32767-1)
+#endif
+#ifndef INT32_MIN
+#define INT32_MIN              (-2147483647-1)
+#endif
+#ifndef INT8_MAX
+#define INT8_MAX               (127)
+#endif
+#ifndef INT16_MAX
+#define INT16_MAX              (32767)
+#endif
+#ifndef INT32_MAX
+#define INT32_MAX              (2147483647)
+#endif
+#ifndef UINT8_MAX
+#define UINT8_MAX              (255U)
+#endif
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+#ifndef UINT32_MAX
+#define UINT32_MAX             (4294967295U)
+#endif
+
+#ifndef SIZE_MAX
+#define SIZE_MAX               (~(size_t)0)
+#endif
+
+#endif /* ! C99 */
+
+#endif /* ! FLEXINT_H */
+
+/* begin standard C++ headers. */
+
+/* TODO: this is always defined, so inline it */
+#define yyconst const
+
+#if defined(__GNUC__) && __GNUC__ >= 3
+#define yynoreturn __attribute__((__noreturn__))
+#else
+#define yynoreturn
+#endif
+
+/* An opaque pointer. */
+#ifndef YY_TYPEDEF_YY_SCANNER_T
+#define YY_TYPEDEF_YY_SCANNER_T
+typedef void* yyscan_t;
+#endif
+
+/* For convenience, these vars (plus the bison vars far below)
+   are macros in the reentrant scanner. */
+#define yyin yyg->yyin_r
+#define yyout yyg->yyout_r
+#define yyextra yyg->yyextra_r
+#define yyleng yyg->yyleng_r
+#define yytext yyg->yytext_r
+#define yylineno (YY_CURRENT_BUFFER_LVALUE->yy_bs_lineno)
+#define yycolumn (YY_CURRENT_BUFFER_LVALUE->yy_bs_column)
+#define yy_flex_debug yyg->yy_flex_debug_r
+
+/* Size of default input buffer. */
+#ifndef YY_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k.
+ * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
+ * Ditto for the __ia64__ case accordingly.
+ */
+#define YY_BUF_SIZE 32768
+#else
+#define YY_BUF_SIZE 16384
+#endif /* __ia64__ */
+#endif
+
+#ifndef YY_TYPEDEF_YY_BUFFER_STATE
+#define YY_TYPEDEF_YY_BUFFER_STATE
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+#endif
+
+#ifndef YY_TYPEDEF_YY_SIZE_T
+#define YY_TYPEDEF_YY_SIZE_T
+typedef size_t yy_size_t;
+#endif
+
+#ifndef YY_STRUCT_YY_BUFFER_STATE
+#define YY_STRUCT_YY_BUFFER_STATE
+struct yy_buffer_state
+	{
+	FILE *yy_input_file;
+
+	char *yy_ch_buf;		/* input buffer */
+	char *yy_buf_pos;		/* current position in input buffer */
+
+	/* Size of input buffer in bytes, not including room for EOB
+	 * characters.
+	 */
+	int yy_buf_size;
+
+	/* Number of characters read into yy_ch_buf, not including EOB
+	 * characters.
+	 */
+	int yy_n_chars;
+
+	/* Whether we "own" the buffer - i.e., we know we created it,
+	 * and can realloc() it to grow it, and should free() it to
+	 * delete it.
+	 */
+	int yy_is_our_buffer;
+
+	/* Whether this is an "interactive" input source; if so, and
+	 * if we're using stdio for input, then we want to use getc()
+	 * instead of fread(), to make sure we stop fetching input after
+	 * each newline.
+	 */
+	int yy_is_interactive;
+
+	/* Whether we're considered to be at the beginning of a line.
+	 * If so, '^' rules will be active on the next match, otherwise
+	 * not.
+	 */
+	int yy_at_bol;
+
+    int yy_bs_lineno; /**< The line count. */
+    int yy_bs_column; /**< The column count. */
+
+	/* Whether to try to fill the input buffer when we reach the
+	 * end of it.
+	 */
+	int yy_fill_buffer;
+
+	int yy_buffer_status;
+
+	};
+#endif /* !YY_STRUCT_YY_BUFFER_STATE */
+
+void yyrestart ( FILE *input_file , yyscan_t yyscanner );
+void yy_switch_to_buffer ( YY_BUFFER_STATE new_buffer , yyscan_t yyscanner );
+YY_BUFFER_STATE yy_create_buffer ( FILE *file, int size , yyscan_t yyscanner );
+void yy_delete_buffer ( YY_BUFFER_STATE b , yyscan_t yyscanner );
+void yy_flush_buffer ( YY_BUFFER_STATE b , yyscan_t yyscanner );
+void yypush_buffer_state ( YY_BUFFER_STATE new_buffer , yyscan_t yyscanner );
+void yypop_buffer_state ( yyscan_t yyscanner );
+
+YY_BUFFER_STATE yy_scan_buffer ( char *base, yy_size_t size , yyscan_t yyscanner );
+YY_BUFFER_STATE yy_scan_string ( const char *yy_str , yyscan_t yyscanner );
+YY_BUFFER_STATE yy_scan_bytes ( const char *bytes, int len , yyscan_t yyscanner );
+
+void *yyalloc ( yy_size_t , yyscan_t yyscanner );
+void *yyrealloc ( void *, yy_size_t , yyscan_t yyscanner );
+void yyfree ( void * , yyscan_t yyscanner );
+
+/* Begin user sect3 */
+
+#define cmGccDepfile_yywrap(yyscanner) (/*CONSTCOND*/1)
+#define YY_SKIP_YYWRAP
+
+#define yytext_ptr yytext_r
+
+#ifdef YY_HEADER_EXPORT_START_CONDITIONS
+#define INITIAL 0
+
+#endif
+
+#ifndef YY_EXTRA_TYPE
+#define YY_EXTRA_TYPE void *
+#endif
+
+int yylex_init (yyscan_t* scanner);
+
+int yylex_init_extra ( YY_EXTRA_TYPE user_defined, yyscan_t* scanner);
+
+/* Accessor methods to globals.
+   These are made visible to non-reentrant scanners for convenience. */
+
+int yylex_destroy ( yyscan_t yyscanner );
+
+int yyget_debug ( yyscan_t yyscanner );
+
+void yyset_debug ( int debug_flag , yyscan_t yyscanner );
+
+YY_EXTRA_TYPE yyget_extra ( yyscan_t yyscanner );
+
+void yyset_extra ( YY_EXTRA_TYPE user_defined , yyscan_t yyscanner );
+
+FILE *yyget_in ( yyscan_t yyscanner );
+
+void yyset_in  ( FILE * _in_str , yyscan_t yyscanner );
+
+FILE *yyget_out ( yyscan_t yyscanner );
+
+void yyset_out  ( FILE * _out_str , yyscan_t yyscanner );
+
+			int yyget_leng ( yyscan_t yyscanner );
+
+char *yyget_text ( yyscan_t yyscanner );
+
+int yyget_lineno ( yyscan_t yyscanner );
+
+void yyset_lineno ( int _line_number , yyscan_t yyscanner );
+
+int yyget_column  ( yyscan_t yyscanner );
+
+void yyset_column ( int _column_no , yyscan_t yyscanner );
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int yywrap ( yyscan_t yyscanner );
+#else
+extern int yywrap ( yyscan_t yyscanner );
+#endif
+#endif
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy ( char *, const char *, int , yyscan_t yyscanner);
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen ( const char * , yyscan_t yyscanner);
+#endif
+
+#ifndef YY_NO_INPUT
+
+#endif
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k */
+#define YY_READ_BUF_SIZE 16384
+#else
+#define YY_READ_BUF_SIZE 8192
+#endif /* __ia64__ */
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL_IS_OURS 1
+
+extern int yylex (yyscan_t yyscanner);
+
+#define YY_DECL int yylex (yyscan_t yyscanner)
+#endif /* !YY_DECL */
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+#undef YY_NEW_FILE
+#undef YY_FLUSH_BUFFER
+#undef yy_set_bol
+#undef yy_new_buffer
+#undef yy_set_interactive
+#undef YY_DO_BEFORE_ACTION
+
+#ifdef YY_DECL_IS_OURS
+#undef YY_DECL_IS_OURS
+#undef YY_DECL
+#endif
+
+#ifndef cmGccDepfile_yy_create_buffer_ALREADY_DEFINED
+#undef yy_create_buffer
+#endif
+#ifndef cmGccDepfile_yy_delete_buffer_ALREADY_DEFINED
+#undef yy_delete_buffer
+#endif
+#ifndef cmGccDepfile_yy_scan_buffer_ALREADY_DEFINED
+#undef yy_scan_buffer
+#endif
+#ifndef cmGccDepfile_yy_scan_string_ALREADY_DEFINED
+#undef yy_scan_string
+#endif
+#ifndef cmGccDepfile_yy_scan_bytes_ALREADY_DEFINED
+#undef yy_scan_bytes
+#endif
+#ifndef cmGccDepfile_yy_init_buffer_ALREADY_DEFINED
+#undef yy_init_buffer
+#endif
+#ifndef cmGccDepfile_yy_flush_buffer_ALREADY_DEFINED
+#undef yy_flush_buffer
+#endif
+#ifndef cmGccDepfile_yy_load_buffer_state_ALREADY_DEFINED
+#undef yy_load_buffer_state
+#endif
+#ifndef cmGccDepfile_yy_switch_to_buffer_ALREADY_DEFINED
+#undef yy_switch_to_buffer
+#endif
+#ifndef cmGccDepfile_yypush_buffer_state_ALREADY_DEFINED
+#undef yypush_buffer_state
+#endif
+#ifndef cmGccDepfile_yypop_buffer_state_ALREADY_DEFINED
+#undef yypop_buffer_state
+#endif
+#ifndef cmGccDepfile_yyensure_buffer_stack_ALREADY_DEFINED
+#undef yyensure_buffer_stack
+#endif
+#ifndef cmGccDepfile_yylex_ALREADY_DEFINED
+#undef yylex
+#endif
+#ifndef cmGccDepfile_yyrestart_ALREADY_DEFINED
+#undef yyrestart
+#endif
+#ifndef cmGccDepfile_yylex_init_ALREADY_DEFINED
+#undef yylex_init
+#endif
+#ifndef cmGccDepfile_yylex_init_extra_ALREADY_DEFINED
+#undef yylex_init_extra
+#endif
+#ifndef cmGccDepfile_yylex_destroy_ALREADY_DEFINED
+#undef yylex_destroy
+#endif
+#ifndef cmGccDepfile_yyget_debug_ALREADY_DEFINED
+#undef yyget_debug
+#endif
+#ifndef cmGccDepfile_yyset_debug_ALREADY_DEFINED
+#undef yyset_debug
+#endif
+#ifndef cmGccDepfile_yyget_extra_ALREADY_DEFINED
+#undef yyget_extra
+#endif
+#ifndef cmGccDepfile_yyset_extra_ALREADY_DEFINED
+#undef yyset_extra
+#endif
+#ifndef cmGccDepfile_yyget_in_ALREADY_DEFINED
+#undef yyget_in
+#endif
+#ifndef cmGccDepfile_yyset_in_ALREADY_DEFINED
+#undef yyset_in
+#endif
+#ifndef cmGccDepfile_yyget_out_ALREADY_DEFINED
+#undef yyget_out
+#endif
+#ifndef cmGccDepfile_yyset_out_ALREADY_DEFINED
+#undef yyset_out
+#endif
+#ifndef cmGccDepfile_yyget_leng_ALREADY_DEFINED
+#undef yyget_leng
+#endif
+#ifndef cmGccDepfile_yyget_text_ALREADY_DEFINED
+#undef yyget_text
+#endif
+#ifndef cmGccDepfile_yyget_lineno_ALREADY_DEFINED
+#undef yyget_lineno
+#endif
+#ifndef cmGccDepfile_yyset_lineno_ALREADY_DEFINED
+#undef yyset_lineno
+#endif
+#ifndef cmGccDepfile_yyget_column_ALREADY_DEFINED
+#undef yyget_column
+#endif
+#ifndef cmGccDepfile_yyset_column_ALREADY_DEFINED
+#undef yyset_column
+#endif
+#ifndef cmGccDepfile_yywrap_ALREADY_DEFINED
+#undef yywrap
+#endif
+#ifndef cmGccDepfile_yyget_lval_ALREADY_DEFINED
+#undef yyget_lval
+#endif
+#ifndef cmGccDepfile_yyset_lval_ALREADY_DEFINED
+#undef yyset_lval
+#endif
+#ifndef cmGccDepfile_yyget_lloc_ALREADY_DEFINED
+#undef yyget_lloc
+#endif
+#ifndef cmGccDepfile_yyset_lloc_ALREADY_DEFINED
+#undef yyset_lloc
+#endif
+#ifndef cmGccDepfile_yyalloc_ALREADY_DEFINED
+#undef yyalloc
+#endif
+#ifndef cmGccDepfile_yyrealloc_ALREADY_DEFINED
+#undef yyrealloc
+#endif
+#ifndef cmGccDepfile_yyfree_ALREADY_DEFINED
+#undef yyfree
+#endif
+#ifndef cmGccDepfile_yytext_ALREADY_DEFINED
+#undef yytext
+#endif
+#ifndef cmGccDepfile_yyleng_ALREADY_DEFINED
+#undef yyleng
+#endif
+#ifndef cmGccDepfile_yyin_ALREADY_DEFINED
+#undef yyin
+#endif
+#ifndef cmGccDepfile_yyout_ALREADY_DEFINED
+#undef yyout
+#endif
+#ifndef cmGccDepfile_yy_flex_debug_ALREADY_DEFINED
+#undef yy_flex_debug
+#endif
+#ifndef cmGccDepfile_yylineno_ALREADY_DEFINED
+#undef yylineno
+#endif
+#ifndef cmGccDepfile_yytables_fload_ALREADY_DEFINED
+#undef yytables_fload
+#endif
+#ifndef cmGccDepfile_yytables_destroy_ALREADY_DEFINED
+#undef yytables_destroy
+#endif
+#ifndef cmGccDepfile_yyTABLES_NAME_ALREADY_DEFINED
+#undef yyTABLES_NAME
+#endif
+
+#undef cmGccDepfile_yyIN_HEADER
+#endif /* cmGccDepfile_yyHEADER_H */
diff --git a/Source/LexerParser/cmGccDepfileLexer.in.l b/Source/LexerParser/cmGccDepfileLexer.in.l
new file mode 100644
index 0000000000..08f8577fc2
--- /dev/null
+++ b/Source/LexerParser/cmGccDepfileLexer.in.l
@@ -0,0 +1,72 @@
+%{
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+/* IWYU pragma: no_forward_declare yyguts_t */
+
+#ifndef __clang_analyzer__ /* Suppress clang scan-build warnings */
+
+#include <cmGccDepfileLexerHelper.h>
+#include <string>
+%}
+
+%option prefix="cmGccDepfile_yy"
+%option noyywrap
+%option reentrant
+%pointer
+
+WSPACE [ \t]
+NEWLINE \r?\n
+
+%%
+\${2}                  {
+                         // Unescape the dollar sign.
+                         yyextra->addToCurrentPath("$");
+                       }
+\\#                    {
+                         // Unescape the hash.
+                         yyextra->addToCurrentPath("#");
+                       }
+(\\\\)*\\[ ]           {
+                         // 2N+1 backslashes plus space -> N backslashes plus space.
+                         size_t c = (strlen(yytext) - 1) / 2;
+                         std::string s(c, '\\');
+                         s.push_back(' ');
+                         yyextra->addToCurrentPath(s.c_str());
+                       }
+(\\\\)+[ ]             {
+                         // 2N backslashes plus space -> 2N backslashes, end of filename.
+                         yytext[strlen(yytext) - 1] = 0;
+                         yyextra->addToCurrentPath(yytext);
+                         yyextra->newDependency();
+                       }
+{WSPACE}*\\{NEWLINE}   {
+                         // A line continuation ends the current file name.
+                         yyextra->newDependency();
+                       }
+{NEWLINE}              {
+                         // A newline ends the current file name and the current rule.
+                         yyextra->newEntry();
+                       }
+:{WSPACE}+             {
+                         // A colon followed by space ends the rules and starts a new dependency.
+                         yyextra->newDependency();
+                       }
+{WSPACE}+              {
+                         // Rules and dependencies are separated by blocks of whitespace.
+                         yyextra->newRuleOrDependency();
+                       }
+[a-zA-Z0-9+,/_.~()}{%=@\x5B\x5D!\x80-\xFF-]+ {
+                         // Got a span of plain text.
+                         yyextra->addToCurrentPath(yytext);
+                       }
+.                      {
+                         // Got an otherwise unmatched character.
+                         yyextra->addToCurrentPath(yytext);
+                       }
+
+%%
+
+/*--------------------------------------------------------------------------*/
+
+#endif /* __clang_analyzer__ */
diff --git a/Source/cmGccDepfileLexerHelper.cxx b/Source/cmGccDepfileLexerHelper.cxx
new file mode 100644
index 0000000000..957896f521
--- /dev/null
+++ b/Source/cmGccDepfileLexerHelper.cxx
@@ -0,0 +1,126 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmGccDepfileLexerHelper.h"
+
+#include <cstdio>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "cmGccDepfileReaderTypes.h"
+
+#include "LexerParser/cmGccDepfileLexer.h"
+
+#ifdef _WIN32
+#  include "cmsys/Encoding.h"
+#endif
+
+bool cmGccDepfileLexerHelper::readFile(const char* filePath)
+{
+#ifdef _WIN32
+  wchar_t* wpath = cmsysEncoding_DupToWide(filePath);
+  FILE* file = _wfopen(wpath, L"rb");
+  free(wpath);
+#else
+  FILE* file = fopen(filePath, "r");
+#endif
+  if (!file) {
+    return false;
+  }
+  newEntry();
+  yyscan_t scanner;
+  cmGccDepfile_yylex_init(&scanner);
+  cmGccDepfile_yyset_extra(this, scanner);
+  cmGccDepfile_yyrestart(file, scanner);
+  cmGccDepfile_yylex(scanner);
+  cmGccDepfile_yylex_destroy(scanner);
+  sanitizeContent();
+  fclose(file);
+  return true;
+}
+
+void cmGccDepfileLexerHelper::newEntry()
+{
+  this->HelperState = State::Rule;
+  this->Content.emplace_back();
+  newRule();
+}
+
+void cmGccDepfileLexerHelper::newRule()
+{
+  auto& entry = this->Content.back();
+  if (entry.rules.empty() || !entry.rules.back().empty()) {
+    entry.rules.emplace_back();
+  }
+}
+
+void cmGccDepfileLexerHelper::newDependency()
+{
+  // printf("NEW DEP\n");
+  this->HelperState = State::Dependency;
+  if (this->Content.back().paths.empty() ||
+      !this->Content.back().paths.back().empty()) {
+    this->Content.back().paths.emplace_back();
+  }
+}
+
+void cmGccDepfileLexerHelper::newRuleOrDependency()
+{
+  if (this->HelperState == State::Rule) {
+    newRule();
+  } else {
+    newDependency();
+  }
+}
+
+void cmGccDepfileLexerHelper::addToCurrentPath(const char* s)
+{
+  if (this->Content.empty()) {
+    return;
+  }
+  cmGccStyleDependency* dep = &this->Content.back();
+  std::string* dst = nullptr;
+  switch (this->HelperState) {
+    case State::Rule: {
+      if (dep->rules.empty()) {
+        return;
+      }
+      dst = &dep->rules.back();
+    } break;
+    case State::Dependency: {
+      if (dep->paths.empty()) {
+        return;
+      }
+      dst = &dep->paths.back();
+    } break;
+  }
+  dst->append(s);
+}
+
+void cmGccDepfileLexerHelper::sanitizeContent()
+{
+  for (auto it = this->Content.begin(); it != this->Content.end();) {
+    // Remove empty rules
+    for (auto rit = it->rules.begin(); rit != it->rules.end();) {
+      if (rit->empty()) {
+        rit = it->rules.erase(rit);
+      } else {
+        ++rit;
+      }
+    }
+    // Remove the entry if rules are empty
+    if (it->rules.empty()) {
+      it = this->Content.erase(it);
+    } else {
+      // Remove empty paths
+      for (auto pit = it->paths.begin(); pit != it->paths.end();) {
+        if (pit->empty()) {
+          pit = it->paths.erase(pit);
+        } else {
+          ++pit;
+        }
+      }
+      ++it;
+    }
+  }
+}
diff --git a/Source/cmGccDepfileLexerHelper.h b/Source/cmGccDepfileLexerHelper.h
new file mode 100644
index 0000000000..e6b2fcf5b2
--- /dev/null
+++ b/Source/cmGccDepfileLexerHelper.h
@@ -0,0 +1,40 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmGccDepfileLexerHelper_h
+#define cmGccDepfileLexerHelper_h
+
+#include <utility>
+
+#include <cmGccDepfileReaderTypes.h>
+
+class cmGccDepfileLexerHelper
+{
+public:
+  cmGccDepfileLexerHelper() = default;
+
+  bool readFile(const char* filePath);
+  cmGccDepfileContent extractContent() && { return std::move(this->Content); }
+
+  // Functions called by the lexer
+  void newEntry();
+  void newRule();
+  void newDependency();
+  void newRuleOrDependency();
+  void addToCurrentPath(const char* s);
+
+private:
+  void sanitizeContent();
+
+  cmGccDepfileContent Content;
+
+  enum class State
+  {
+    Rule,
+    Dependency
+  };
+  State HelperState = State::Rule;
+};
+
+#define YY_EXTRA_TYPE cmGccDepfileLexerHelper*
+
+#endif
diff --git a/Source/cmGccDepfileReader.cxx b/Source/cmGccDepfileReader.cxx
new file mode 100644
index 0000000000..9d70edec54
--- /dev/null
+++ b/Source/cmGccDepfileReader.cxx
@@ -0,0 +1,18 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmGccDepfileReader.h"
+
+#include <type_traits>
+#include <utility>
+
+#include "cmGccDepfileLexerHelper.h"
+
+cmGccDepfileContent cmReadGccDepfile(const char* filePath)
+{
+  cmGccDepfileContent result;
+  cmGccDepfileLexerHelper helper;
+  if (helper.readFile(filePath)) {
+    result = std::move(helper).extractContent();
+  }
+  return result;
+}
diff --git a/Source/cmGccDepfileReader.h b/Source/cmGccDepfileReader.h
new file mode 100644
index 0000000000..9313010c43
--- /dev/null
+++ b/Source/cmGccDepfileReader.h
@@ -0,0 +1,10 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmGccDepfileReader_h
+#define cmGccDepfileReader_h
+
+#include "cmGccDepfileReaderTypes.h"
+
+cmGccDepfileContent cmReadGccDepfile(const char* filePath);
+
+#endif
diff --git a/Source/cmGccDepfileReaderTypes.h b/Source/cmGccDepfileReaderTypes.h
new file mode 100644
index 0000000000..8b15c73757
--- /dev/null
+++ b/Source/cmGccDepfileReaderTypes.h
@@ -0,0 +1,17 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef cmGccDepfileReaderTypes_h
+#define cmGccDepfileReaderTypes_h
+
+#include <string>
+#include <vector>
+
+struct cmGccStyleDependency
+{
+  std::vector<std::string> rules;
+  std::vector<std::string> paths;
+};
+
+using cmGccDepfileContent = std::vector<cmGccStyleDependency>;
+
+#endif
diff --git a/Tests/CMakeLib/CMakeLists.txt b/Tests/CMakeLib/CMakeLists.txt
index 25d2de659c..bb50d76f04 100644
--- a/Tests/CMakeLib/CMakeLists.txt
+++ b/Tests/CMakeLib/CMakeLists.txt
@@ -11,6 +11,7 @@ set(CMakeLib_TESTS
   testCTestResourceAllocator.cxx
   testCTestResourceSpec.cxx
   testCTestResourceGroups.cxx
+  testGccDepfileReader.cxx
   testGeneratedFileStream.cxx
   testRST.cxx
   testRange.cxx
@@ -35,6 +36,7 @@ set(testRST_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
 set(testUVProcessChain_ARGS $<TARGET_FILE:testUVProcessChainHelper>)
 set(testUVStreambuf_ARGS $<TARGET_FILE:cmake>)
 set(testCTestResourceSpec_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
+set(testGccDepfileReader_ARGS ${CMAKE_CURRENT_SOURCE_DIR})
 
 if(WIN32)
   list(APPEND CMakeLib_TESTS
diff --git a/Tests/CMakeLib/testGccDepfileReader.cxx b/Tests/CMakeLib/testGccDepfileReader.cxx
new file mode 100644
index 0000000000..924d87b081
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader.cxx
@@ -0,0 +1,131 @@
+#include <cstddef>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "cmsys/FStream.hxx"
+
+#include "cmGccDepfileReader.h"
+#include "cmGccDepfileReaderTypes.h" // for cmGccDepfileContent, cmGccStyle...
+#include "cmSystemTools.h"
+
+namespace {
+
+cmGccDepfileContent readPlainDepfile(const char* filePath)
+{
+  cmGccDepfileContent result;
+  cmsys::ifstream is(filePath);
+  if (!is.is_open())
+    return result;
+  std::string line;
+
+  cmGccStyleDependency dep;
+  bool readingRules = true;
+  while (cmSystemTools::GetLineFromStream(is, line)) {
+    if (line == "--RULES--") {
+      if (!dep.rules.empty()) {
+        result.push_back(std::move(dep));
+        dep = cmGccStyleDependency();
+      }
+      readingRules = true;
+    } else if (line == "--DEPENDENCIES--") {
+      readingRules = false;
+    } else {
+      std::vector<std::string>& dst = readingRules ? dep.rules : dep.paths;
+      dst.push_back(std::move(line));
+      line = std::string();
+    }
+  }
+
+  if (!dep.rules.empty()) {
+    result.push_back(std::move(dep));
+  }
+
+  return result;
+}
+
+bool compare(const std::vector<std::string>& actual,
+             const std::vector<std::string>& expected, const char* msg)
+{
+  if (actual.size() != expected.size()) {
+    std::cerr << msg << "expected " << expected.size() << " entries."
+              << std::endl
+              << "Actual number of entries: " << actual.size() << std::endl;
+    return false;
+  }
+  for (std::size_t i = 0; i < actual.size(); ++i) {
+    if (actual[i] != expected[i]) {
+      std::cerr << msg << std::endl
+                << "expected: " << expected[i] << std::endl
+                << "actual: " << actual[i] << std::endl;
+      return false;
+    }
+  }
+  return true;
+}
+
+bool compare(const cmGccDepfileContent& actual,
+             const cmGccDepfileContent& expected)
+{
+  if (actual.size() != expected.size()) {
+    std::cerr << "Expected " << expected.size() << " entries." << std::endl
+              << "Actual number of entries: " << actual.size() << std::endl;
+    return false;
+  }
+  for (std::size_t i = 0; i < actual.size(); ++i) {
+    if (!compare(actual[i].rules, expected[i].rules, "Rules differ: ") ||
+        !compare(actual[i].paths, expected[i].paths, "Paths differ: ")) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void dump(const char* label, const cmGccDepfileContent& dfc)
+{
+  std::cerr << label << std::endl;
+  for (const auto& entry : dfc) {
+    auto rit = entry.rules.cbegin();
+    if (rit != entry.rules.cend()) {
+      std::cerr << *rit;
+      for (++rit; rit != entry.rules.cend(); ++rit) {
+        std::cerr << "  " << *rit;
+      }
+      std::cerr << ": " << std::endl;
+    }
+    for (const auto& path : entry.paths) {
+      std::cerr << "    " << path << std::endl;
+    }
+  }
+}
+
+} // anonymous namespace
+
+int testGccDepfileReader(int argc, char* argv[])
+{
+  if (argc < 2) {
+    std::cout << "Invalid arguments.\n";
+    return -1;
+  }
+
+  std::string dataDirPath = argv[1];
+  dataDirPath += "/testGccDepfileReader_data";
+  const int numberOfTestFiles = 3;
+  for (int i = 1; i <= numberOfTestFiles; ++i) {
+    const std::string base = dataDirPath + "/deps" + std::to_string(i);
+    const std::string depfile = base + ".d";
+    const std::string plainDepfile = base + ".txt";
+    std::cout << "Comparing " << base << " with " << plainDepfile << std::endl;
+    const auto actual = cmReadGccDepfile(depfile.c_str());
+    const auto expected = readPlainDepfile(plainDepfile.c_str());
+    if (!compare(actual, expected)) {
+      dump("actual", actual);
+      dump("expected", expected);
+      return 1;
+    }
+  }
+
+  return 0;
+}
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps1.d b/Tests/CMakeLib/testGccDepfileReader_data/deps1.d
new file mode 100644
index 0000000000..9e34863338
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps1.d
@@ -0,0 +1,20 @@
+main.o: main.cpp /usr/include/stdc-predef.h /usr/include/stdio.h \
+ /usr/include/x86_64-linux-gnu/bits/libc-header-start.h \
+ /usr/include/features.h /usr/include/x86_64-linux-gnu/sys/cdefs.h \
+ /usr/include/x86_64-linux-gnu/bits/wordsize.h \
+ /usr/include/x86_64-linux-gnu/bits/long-double.h \
+ /usr/include/x86_64-linux-gnu/gnu/stubs.h \
+ /usr/include/x86_64-linux-gnu/gnu/stubs-64.h \
+ /usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h \
+ /usr/lib/gcc/x86_64-linux-gnu/8/include/stdarg.h \
+ /usr/include/x86_64-linux-gnu/bits/types.h \
+ /usr/include/x86_64-linux-gnu/bits/typesizes.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h \
+ /usr/include/x86_64-linux-gnu/bits/types/__FILE.h \
+ /usr/include/x86_64-linux-gnu/bits/types/FILE.h \
+ /usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h \
+ /usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h \
+ /usr/include/x86_64-linux-gnu/bits/stdio_lim.h \
+ /usr/include/x86_64-linux-gnu/bits/sys_errlist.h
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps1.txt b/Tests/CMakeLib/testGccDepfileReader_data/deps1.txt
new file mode 100644
index 0000000000..fd2679f41a
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps1.txt
@@ -0,0 +1,26 @@
+--RULES--
+main.o
+--DEPENDENCIES--
+main.cpp
+/usr/include/stdc-predef.h
+/usr/include/stdio.h
+/usr/include/x86_64-linux-gnu/bits/libc-header-start.h
+/usr/include/features.h
+/usr/include/x86_64-linux-gnu/sys/cdefs.h
+/usr/include/x86_64-linux-gnu/bits/wordsize.h
+/usr/include/x86_64-linux-gnu/bits/long-double.h
+/usr/include/x86_64-linux-gnu/gnu/stubs.h
+/usr/include/x86_64-linux-gnu/gnu/stubs-64.h
+/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h
+/usr/lib/gcc/x86_64-linux-gnu/8/include/stdarg.h
+/usr/include/x86_64-linux-gnu/bits/types.h
+/usr/include/x86_64-linux-gnu/bits/typesizes.h
+/usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h
+/usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h
+/usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h
+/usr/include/x86_64-linux-gnu/bits/types/__FILE.h
+/usr/include/x86_64-linux-gnu/bits/types/FILE.h
+/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h
+/usr/include/x86_64-linux-gnu/bits/types/cookie_io_functions_t.h
+/usr/include/x86_64-linux-gnu/bits/stdio_lim.h
+/usr/include/x86_64-linux-gnu/bits/sys_errlist.h
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps2.d b/Tests/CMakeLib/testGccDepfileReader_data/deps2.d
new file mode 100644
index 0000000000..25f0d780d3
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps2.d
@@ -0,0 +1 @@
+foo.o bar.o: foobar.c
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps2.txt b/Tests/CMakeLib/testGccDepfileReader_data/deps2.txt
new file mode 100644
index 0000000000..afaf78e1df
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps2.txt
@@ -0,0 +1,5 @@
+--RULES--
+foo.o
+bar.o
+--DEPENDENCIES--
+foobar.c
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps3.d b/Tests/CMakeLib/testGccDepfileReader_data/deps3.d
new file mode 100644
index 0000000000..d75ceed2cd
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps3.d
@@ -0,0 +1,2 @@
+main.o: main.cpp foo\#bar.h foo\\#bar.h foo\ bar.h \
+ foo\\\ bar.h foo\\\\\ bar.h foo\\\\ foo$$bar.h
diff --git a/Tests/CMakeLib/testGccDepfileReader_data/deps3.txt b/Tests/CMakeLib/testGccDepfileReader_data/deps3.txt
new file mode 100644
index 0000000000..448f69c1e5
--- /dev/null
+++ b/Tests/CMakeLib/testGccDepfileReader_data/deps3.txt
@@ -0,0 +1,11 @@
+--RULES--
+main.o
+--DEPENDENCIES--
+main.cpp
+foo#bar.h
+foo\#bar.h
+foo bar.h
+foo\ bar.h
+foo\\ bar.h
+foo\\\\
+foo$bar.h
diff --git a/Utilities/Scripts/regenerate-lexers.bash b/Utilities/Scripts/regenerate-lexers.bash
index 1b61b705e8..186802a854 100755
--- a/Utilities/Scripts/regenerate-lexers.bash
+++ b/Utilities/Scripts/regenerate-lexers.bash
@@ -14,7 +14,8 @@ for lexer in            \
     CTestResourceGroups \
     DependsJava         \
     Expr                \
-    Fortran
+    Fortran             \
+    GccDepfile
 do
     cxx_file=cm${lexer}Lexer.cxx
     h_file=cm${lexer}Lexer.h