* c-decl.c (store_parm_decls): Make saved_warn_shadow boolean.

	* common.opt: Add remaining -W options and -g.
	* diagnostic.c (warnings_are_errors): Remove.
	* flags.h: Make most warning flags boolean.
	* opts.c (common_handle_option): Handle remaining -W options, and -g.
	Move many warning flags from toplev.c, making them boolean.
	* toplev.c: Remove many warning flags.
	(decode_W_option): Remove.
	(decode_g_option): Make extern.  Error on unknown switch.
	(lang_independent_W_options): Use warn_dummy.
	(independent_decode_option): Just handle -f switches now.
	* toplev.h (decode_g_option): New.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@68287 138bc75d-0d04-0410-961f-82ee72b054a4

8 files changed, 323 insertions, 208 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ad409c76db7..afb35b1bf94 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,18 @@
+2003-06-20  Neil Booth  <neil@daikokuya.co.uk>
+
+	* c-decl.c (store_parm_decls): Make saved_warn_shadow boolean.
+	* common.opt: Add remaining -W options and -g.
+	* diagnostic.c (warnings_are_errors): Remove.
+	* flags.h: Make most warning flags boolean.
+	* opts.c (common_handle_option): Handle remaining -W options, and -g.
+	Move many warning flags from toplev.c, making them boolean.
+	* toplev.c: Remove many warning flags.
+	(decode_W_option): Remove.
+	(decode_g_option): Make extern.  Error on unknown switch.
+	(lang_independent_W_options): Use warn_dummy.
+	(independent_decode_option): Just handle -f switches now.
+	* toplev.h (decode_g_option): New.
+
 2003-06-20  Aldy Hernandez  <aldyh@redhat.com>
 	
 	PR/11092
diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index df0984081d8..c635a9d60ec 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -5719,10 +5719,10 @@ store_parm_decls (void)
   /* Nonzero if this definition is written with a prototype.  */
   int prototype = 0;
 
-  int saved_warn_shadow = warn_shadow;
+  bool saved_warn_shadow = warn_shadow;
 
   /* Don't re-emit shadow warnings.  */
-  warn_shadow = 0;
+  warn_shadow = false;
 
   if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
     {
diff --git a/gcc/common.opt b/gcc/common.opt
index 91fb0c71aac..7ce20bb8ee5 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -46,12 +46,81 @@ Common
 W
 Common RejectNegative
 
+Waggregate-return
+Common
+
+Wcast-align
+Common
+
+Wdeprecated-declarations
+Common
+
+Wdisabled-optimization
+Common
+
+Werror
+Common
+
 Wextra
 Common
 
+Winline
+Common
+
+Wlarger-than-
+Common RejectNegative Joined UInteger
+
+Wmissing-noreturn
+Common
+
+Wpacked
+Common
+
+Wpadded
+Common
+
+Wshadow
+Common
+
+Wstrict-aliasing
+Common
+
+Wswitch
+Common
+
+Wswitch-default
+Common
+
+Wswitch-enum
+Common
+
+Wsystem-headers
+Common
+
+Wuninitialized
+Common
+
+Wunreachable-code
+Common
+
 Wunused
 Common
 
+Wunused-function
+Common
+
+Wunused-label
+Common
+
+Wunused-parameter
+Common
+
+Wunused-value
+Common
+
+Wunused-variable
+Common
+
 aux-info
 Common Separate
 
@@ -70,6 +139,9 @@ Common Joined
 dumpbase
 Common Separate
 
+g
+Common JoinedOrMissing
+
 m
 Common Joined
 
diff --git a/gcc/diagnostic.c b/gcc/diagnostic.c
index 674f5e3c2cd..35fbb6f2288 100644
--- a/gcc/diagnostic.c
+++ b/gcc/diagnostic.c
@@ -85,7 +85,6 @@ static void diagnostic_action_after_output (diagnostic_context *,
 static void real_abort (void) ATTRIBUTE_NORETURN;
 
 extern int rtl_dump_and_exit;
-extern int warnings_are_errors;
 
 /* A diagnostic_context surrogate for stderr.  */
 static diagnostic_context global_diagnostic_context;
diff --git a/gcc/flags.h b/gcc/flags.h
index d9ac7bfb055..6ef4ece9083 100644
--- a/gcc/flags.h
+++ b/gcc/flags.h
@@ -77,16 +77,20 @@ extern int mem_report;
 
 /* Don't print warning messages.  -w.  */
 
-extern int inhibit_warnings;
+extern bool inhibit_warnings;
 
 /* Don't suppress warnings from system headers.  -Wsystem-headers.  */
 
-extern int warn_system_headers;
+extern bool warn_system_headers;
 
 /* Do print extra warnings (such as for uninitialized variables).
    -W/-Wextra.  */
 
-extern int extra_warnings;
+extern bool extra_warnings;
+
+/* If -Werror.  */
+
+extern bool warnings_are_errors;
 
 /* Nonzero to warn about unused variables, functions et.al.  Use
    set_Wunused() to update the -Wunused-* flags that correspond to the
@@ -94,19 +98,19 @@ extern int extra_warnings;
 
 extern void set_Wunused PARAMS ((int setting));
 
-extern int warn_unused_function;
-extern int warn_unused_label;
-extern int warn_unused_parameter;
-extern int warn_unused_variable;
-extern int warn_unused_value;
+extern bool warn_unused_function;
+extern bool warn_unused_label;
+extern bool warn_unused_parameter;
+extern bool warn_unused_variable;
+extern bool warn_unused_value;
 
 /* Nonzero to warn about code which is never reached.  */
 
-extern int warn_notreached;
+extern bool warn_notreached;
 
 /* Nonzero means warn if inline function is too large.  */
 
-extern int warn_inline;
+extern bool warn_inline;
 
 /* Nonzero to warn about variables used before they are initialized.  */
 
@@ -114,21 +118,21 @@ extern int warn_uninitialized;
 
 /* Nonzero means warn about all declarations which shadow others.  */
 
-extern int warn_shadow;
+extern bool warn_shadow;
 
 /* Warn if a switch on an enum, that does not have a default case,
    fails to have a case for every enum value.  */
 
-extern int warn_switch;
+extern bool warn_switch;
 
 /* Warn if a switch does not have a default case.  */
 
-extern int warn_switch_default;
+extern bool warn_switch_default;
 
 /* Warn if a switch on an enum fails to have a case for every enum
    value (regardless of the presence or otherwise of a default case).  */
 
-extern int warn_switch_enum;
+extern bool warn_switch_enum;
 
 /* Nonzero means warn about function definitions that default the return type
    or that use a null return and have a return-type other than void.  */
@@ -137,47 +141,47 @@ extern int warn_return_type;
 
 /* Warn about functions which might be candidates for attribute noreturn.  */
 
-extern int warn_missing_noreturn;
+extern bool warn_missing_noreturn;
 
 /* Nonzero means warn about pointer casts that increase the required
    alignment of the target type (and might therefore lead to a crash
    due to a misaligned access).  */
 
-extern int warn_cast_align;
+extern bool warn_cast_align;
 
 /* Nonzero means warn about any objects definitions whose size is larger
    than N bytes.  Also want about function definitions whose returned
    values are larger than N bytes. The value N is in `larger_than_size'.  */
 
-extern int warn_larger_than;
+extern bool warn_larger_than;
 extern HOST_WIDE_INT larger_than_size;
 
 /* Warn if a function returns an aggregate,
    since there are often incompatible calling conventions for doing this.  */
 
-extern int warn_aggregate_return;
+extern bool warn_aggregate_return;
 
 /* Warn if packed attribute on struct is unnecessary and inefficient.  */
 
-extern int warn_packed;
+extern bool warn_packed;
 
 /* Warn when gcc pads a structure to an alignment boundary.  */
 
-extern int warn_padded;
+extern bool warn_padded;
 
 /* Warn when an optimization pass is disabled.  */
 
-extern int warn_disabled_optimization;
+extern bool warn_disabled_optimization;
 
 /* Nonzero means warn about uses of __attribute__((deprecated)) 
    declarations.  */
 
-extern int warn_deprecated_decl;
+extern bool warn_deprecated_decl;
 
 /* Nonzero means warn about constructs which might not be strict
    aliasing safe.  */
 
-extern int warn_strict_aliasing;
+extern bool warn_strict_aliasing;
 
 /* Nonzero if generating code to do profiling.  */
 
diff --git a/gcc/opts.c b/gcc/opts.c
index 56415a1eb00..ddd116938ab 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -41,6 +41,83 @@ bool exit_after_options;
 /* If -version.  */
 bool version_flag;
 
+/* Print various extra warnings.  -W/-Wextra.  */
+bool extra_warnings;
+
+/* Don't print warning messages.  -w.  */
+bool inhibit_warnings;
+
+/* Treat warnings as errors.  -Werror.  */
+bool warnings_are_errors;
+
+/* Warn if a function returns an aggregate, since there are often
+   incompatible calling conventions for doing this.  */
+bool warn_aggregate_return;
+
+/* Nonzero means warn about pointer casts that increase the required
+   alignment of the target type (and might therefore lead to a crash
+   due to a misaligned access).  */
+bool warn_cast_align;
+
+/* Nonzero means warn about uses of __attribute__((deprecated))
+   declarations.  */
+bool warn_deprecated_decl = true;
+
+/* Warn when an optimization pass is disabled.  */
+bool warn_disabled_optimization;
+
+/* Nonzero means warn if inline function is too large.  */
+bool warn_inline;
+
+/* True to warn about any objects definitions whose size is larger
+   than N bytes.  Also want about function definitions whose returned
+   values are larger than N bytes, where N is `larger_than_size'.  */
+bool warn_larger_than;
+HOST_WIDE_INT larger_than_size;
+
+/* Warn about functions which might be candidates for attribute noreturn.  */
+bool warn_missing_noreturn;
+
+/* True to warn about code which is never reached.  */
+bool warn_notreached;
+
+/* Warn if packed attribute on struct is unnecessary and inefficient.  */
+bool warn_packed;
+
+/* Warn when gcc pads a structure to an alignment boundary.  */
+bool warn_padded;
+
+/* True means warn about all declarations which shadow others.  */
+bool warn_shadow;
+
+/* Nonzero means warn about constructs which might not be
+   strict-aliasing safe.  */
+bool warn_strict_aliasing;
+
+/* True to warn if a switch on an enum, that does not have a default
+   case, fails to have a case for every enum value.  */
+bool warn_switch;
+
+/* Warn if a switch does not have a default case.  */
+bool warn_switch_default;
+
+/* Warn if a switch on an enum fails to have a case for every enum
+   value (regardless of the presence or otherwise of a default case).  */
+bool warn_switch_enum;
+
+/* Don't suppress warnings from system headers.  -Wsystem-headers.  */
+bool warn_system_headers;
+
+/* True to warn about variables used before they are initialized.  */
+int warn_uninitialized;
+
+/* True to warn about unused variables, functions et.al.  */
+bool warn_unused_function;
+bool warn_unused_label;
+bool warn_unused_parameter;
+bool warn_unused_variable;
+bool warn_unused_value;
+
 /* Hack for cooperation between set_Wunused and set_Wextra.  */
 static bool maybe_warn_unused_parameter;
 
@@ -136,7 +213,7 @@ find_opt (const char *input, int lang_mask)
   return result;
 }
 
-/* If ARG is a postive integer made up solely of digits, return its
+/* If ARG is a non-negative integer made up solely of digits, return its
    value, otherwise return -1.  */
 static int
 integral_argument (const char *arg)
@@ -316,14 +393,106 @@ common_handle_option (size_t scode, const char *arg,
       set_Wextra (value);
       break;
 
+    case OPT_Waggregate_return:
+      warn_aggregate_return = value;
+      break;
+
+    case OPT_Wcast_align:
+      warn_cast_align = value;
+      break;
+
+    case OPT_Wdeprecated_declarations:
+      warn_deprecated_decl = value;
+
+    case OPT_Wdisabled_optimization:
+      warn_disabled_optimization = value;
+      break;
+
+    case OPT_Werror:
+      warnings_are_errors = value;
+      break;
+
     case OPT_Wextra:
       set_Wextra (value);
       break;
 
+    case OPT_Winline:
+      warn_inline = value;
+      break;
+
+    case OPT_Wlarger_than_:
+      larger_than_size = value;
+      warn_larger_than = value != -1;
+      break;
+
+    case OPT_Wmissing_noreturn:
+      warn_missing_noreturn = value;
+      break;
+
+    case OPT_Wpacked:
+      warn_packed = value;
+      break;
+
+    case OPT_Wpadded:
+      warn_padded = value;
+      break;
+
+    case OPT_Wshadow:
+      warn_shadow = value;
+      break;
+
+    case OPT_Wstrict_aliasing:
+      warn_strict_aliasing = value;
+      break;
+
+    case OPT_Wswitch:
+      warn_switch = value;
+      break;
+
+    case OPT_Wswitch_default:
+      warn_switch_default = value;
+      break;
+
+    case OPT_Wswitch_enum:
+      warn_switch_enum = value;
+      break;
+
+    case OPT_Wsystem_headers:
+      warn_system_headers = value;
+      break;
+
+    case OPT_Wuninitialized:
+      warn_uninitialized = value;
+      break;
+
+    case OPT_Wunreachable_code:
+      warn_notreached = value;
+      break;
+
     case OPT_Wunused:
       set_Wunused (value);
       break;
 
+    case OPT_Wunused_function:
+      warn_unused_function = value;
+      break;
+
+    case OPT_Wunused_label:
+      warn_unused_label = value;
+      break;
+
+    case OPT_Wunused_parameter:
+      warn_unused_parameter = value;
+      break;
+
+    case OPT_Wunused_value:
+      warn_unused_value = value;
+      break;
+
+    case OPT_Wunused_variable:
+      warn_unused_variable = value;
+      break;
+
     case OPT_aux_info:
     case OPT_aux_info_:
       aux_info_file_name = arg;
@@ -351,6 +520,10 @@ common_handle_option (size_t scode, const char *arg,
       dump_base_name = arg;
       break;
 
+    case OPT_g:
+      decode_g_option (arg);
+      break;
+
     case OPT_m:
       set_target_switch (arg);
       break;
@@ -380,7 +553,7 @@ common_handle_option (size_t scode, const char *arg,
       break;
 
     case OPT_w:
-      inhibit_warnings = 1;
+      inhibit_warnings = true;
       break;      
     }
 
diff --git a/gcc/toplev.c b/gcc/toplev.c
index 602ce6ff098..4bee42e153a 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -118,8 +118,6 @@ static void setup_core_dumping (void);
 static void compile_file (void);
 
 static int decode_f_option (const char *);
-static int decode_W_option (const char *);
-static int decode_g_option (const char *);
 static unsigned int independent_decode_option (char **);
 
 static int print_single_switch (FILE *, int, int, const char *,
@@ -1492,156 +1490,61 @@ target_options[] = TARGET_OPTIONS;
 
 /* Options controlling warnings.  */
 
-/* Don't print warning messages.  -w.  */
-
-int inhibit_warnings = 0;
-
-/* Don't suppress warnings from system headers.  -Wsystem-headers.  */
-
-int warn_system_headers = 0;
-
-/* Print various extra warnings.  -W/-Wextra.  */
-
-int extra_warnings = 0;
-
-/* Treat warnings as errors.  -Werror.  */
-
-int warnings_are_errors = 0;
-
-/* Nonzero to warn about unused variables, functions et.al.  */
-
-int warn_unused_function;
-int warn_unused_label;
-int warn_unused_parameter;
-int warn_unused_variable;
-int warn_unused_value;
-
-/* Nonzero to warn about code which is never reached.  */
-
-int warn_notreached;
-
-/* Nonzero to warn about variables used before they are initialized.  */
-
-int warn_uninitialized;
-
-/* Nonzero means warn about all declarations which shadow others.  */
-
-int warn_shadow;
-
-/* Warn if a switch on an enum, that does not have a default case,
-   fails to have a case for every enum value.  */
-
-int warn_switch;
-
-/* Warn if a switch does not have a default case.  */
-
-int warn_switch_default;
-
-/* Warn if a switch on an enum fails to have a case for every enum
-   value (regardless of the presence or otherwise of a default case).  */
-
-int warn_switch_enum;
-
 /* Nonzero means warn about function definitions that default the return type
    or that use a null return and have a return-type other than void.  */
 
 int warn_return_type;
 
-/* Nonzero means warn about pointer casts that increase the required
-   alignment of the target type (and might therefore lead to a crash
-   due to a misaligned access).  */
-
-int warn_cast_align;
-
-/* Nonzero means warn about any objects definitions whose size is larger
-   than N bytes.  Also want about function definitions whose returned
-   values are larger than N bytes. The value N is in `larger_than_size'.  */
-
-int warn_larger_than;
-HOST_WIDE_INT larger_than_size;
-
-/* Nonzero means warn if inline function is too large.  */
-
-int warn_inline;
-
-/* Warn if a function returns an aggregate,
-   since there are often incompatible calling conventions for doing this.  */
-
-int warn_aggregate_return;
-
-/* Warn if packed attribute on struct is unnecessary and inefficient.  */
-
-int warn_packed;
-
-/* Warn when gcc pads a structure to an alignment boundary.  */
-
-int warn_padded;
-
-/* Warn when an optimization pass is disabled.  */
-
-int warn_disabled_optimization;
-
-/* Warn about functions which might be candidates for attribute noreturn.  */
-
-int warn_missing_noreturn;
-
-/* Nonzero means warn about uses of __attribute__((deprecated))
-   declarations.  */
-
-int warn_deprecated_decl = 1;
-
-/* Nonzero means warn about constructs which might not be
-   strict-aliasing safe.  */
-
-int warn_strict_aliasing;
+/* Used for the -W options array temporarily.  */
+static int warn_dummy;
 
 /* Like f_options, but for -W.  */
 
 static const lang_independent_options W_options[] =
 {
-  {"unused-function", &warn_unused_function, 1,
+  {"unused-function", &warn_dummy, 1,
    N_("Warn when a function is unused") },
-  {"unused-label", &warn_unused_label, 1,
+  {"unused-label", &warn_dummy, 1,
    N_("Warn when a label is unused") },
-  {"unused-parameter", &warn_unused_parameter, 1,
+  {"unused-parameter", &warn_dummy, 1,
    N_("Warn when a function parameter is unused") },
-  {"unused-variable", &warn_unused_variable, 1,
+  {"unused-variable", &warn_dummy, 1,
    N_("Warn when a variable is unused") },
-  {"unused-value", &warn_unused_value, 1,
+  {"unused-value", &warn_dummy, 1,
    N_("Warn when an expression value is unused") },
-  {"system-headers", &warn_system_headers, 1,
+  {"system-headers", &warn_dummy, 1,
    N_("Do not suppress warnings from system headers") },
-  {"error", &warnings_are_errors, 1,
+  {"error", &warn_dummy, 1,
    N_("Treat all warnings as errors") },
-  {"shadow", &warn_shadow, 1,
+  {"shadow", &warn_dummy, 1,
    N_("Warn when one local variable shadows another") },
-  {"switch", &warn_switch, 1,
+  {"switch", &warn_dummy, 1,
    N_("Warn about enumerated switches, with no default, missing a case") },
-  {"switch-default", &warn_switch_default, 1,
+  {"switch-default", &warn_dummy, 1,
    N_("Warn about enumerated switches missing a default case") },
-  {"switch-enum", &warn_switch_enum, 1,
+  {"switch-enum", &warn_dummy, 1,
    N_("Warn about all enumerated switches missing a specific case") },
-  {"aggregate-return", &warn_aggregate_return, 1,
+  {"aggregate-return", &warn_dummy, 1,
    N_("Warn about returning structures, unions or arrays") },
-  {"cast-align", &warn_cast_align, 1,
+  {"cast-align", &warn_dummy, 1,
    N_("Warn about pointer casts which increase alignment") },
-  {"unreachable-code", &warn_notreached, 1,
+  {"unreachable-code", &warn_dummy, 1,
    N_("Warn about code that will never be executed") },
-  {"uninitialized", &warn_uninitialized, 1,
+  {"uninitialized", &warn_dummy, 1,
    N_("Warn about uninitialized automatic variables") },
-  {"inline", &warn_inline, 1,
+  {"inline", &warn_dummy, 1,
    N_("Warn when an inlined function cannot be inlined") },
-  {"packed", &warn_packed, 1,
+  {"packed", &warn_dummy, 1,
    N_("Warn when the packed attribute has no effect on struct layout") },
-  {"padded", &warn_padded, 1,
+  {"padded", &warn_dummy, 1,
    N_("Warn when padding is required to align struct members") },
-  {"disabled-optimization", &warn_disabled_optimization, 1,
+  {"disabled-optimization", &warn_dummy, 1,
    N_("Warn when an optimization pass is disabled") },
-  {"deprecated-declarations", &warn_deprecated_decl, 1,
+  {"deprecated-declarations", &warn_dummy, 1,
    N_("Warn about uses of __attribute__((deprecated)) declarations") },
-  {"missing-noreturn", &warn_missing_noreturn, 1,
+  {"missing-noreturn", &warn_dummy, 1,
    N_("Warn about functions which might be candidates for attribute noreturn") },
-  {"strict-aliasing", &warn_strict_aliasing, 1,
+  {"strict-aliasing", &warn_dummy, 1,
    N_ ("Warn about code which might break the strict aliasing rules") }
 };
 
@@ -4397,48 +4300,6 @@ decode_f_option (const char *arg)
   return 1;
 }
 
-/* Parse a -W... command line switch.  ARG is the value after the -W.
-   It is safe to access 'ARG - 2' to generate the full switch name.
-   Return the number of strings consumed.  */
-
-static int
-decode_W_option (const char *arg)
-{
-  const char *option_value = NULL;
-  int j;
-
-  /* Search for the option in the table of binary W options.  */
-
-  for (j = ARRAY_SIZE (W_options); j--;)
-    {
-      if (!strcmp (arg, W_options[j].string))
-	{
-	  *W_options[j].variable = W_options[j].on_value;
-	  return 1;
-	}
-
-      if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
-	  && ! strcmp (arg + 3, W_options[j].string))
-	{
-	  *W_options[j].variable = ! W_options[j].on_value;
-	  return 1;
-	}
-    }
-
-  if ((option_value = skip_leading_substring (arg, "id-clash-")))
-    warning ("-Wid-clash-LEN is no longer supported");
-  else if ((option_value = skip_leading_substring (arg, "larger-than-")))
-    {
-      larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
-
-      warn_larger_than = larger_than_size != -1;
-    }
-  else
-    return 0;
-
-  return 1;
-}
-
 /* Indexed by enum debug_info_type.  */
 const char *const debug_type_names[] =
 {
@@ -4449,7 +4310,7 @@ const char *const debug_type_names[] =
    It is safe to access 'ARG - 2' to generate the full switch name.
    Return the number of strings consumed.  */
 
-static int
+void
 decode_g_option (const char *arg)
 {
   static unsigned level = 0;
@@ -4560,9 +4421,7 @@ ignoring option `%s' due to invalid debug level specification",
     }
 
   if (! da->arg)
-    return 0;
-
-  return 1;
+    warning ("`-g%s': unknown or unsupported -g option", arg);
 }
 
 /* Decode the first argument in the argv as a language-independent option.
@@ -4578,20 +4437,10 @@ independent_decode_option (char **argv)
 
   arg++;
 
-  switch (*arg)
-    {
-    default:
-      return 0;
-
-    case 'f':
-      return decode_f_option (arg + 1);
+  if (*arg == 'f')
+    return decode_f_option (arg + 1);
 
-    case 'g':
-      return decode_g_option (arg + 1);
-
-    case 'W':
-      return decode_W_option (arg + 1);
-    }
+  return 0;
 }
 
 /* Decode -m switches.  */
diff --git a/gcc/toplev.h b/gcc/toplev.h
index 52ceb5f4ae7..10fa181eea6 100644
--- a/gcc/toplev.h
+++ b/gcc/toplev.h
@@ -120,6 +120,9 @@ extern void set_fast_math_flags         (int);
 /* Handle -d switch.  */
 extern void decode_d_option		(const char *);
 
+/* Handle -g switch.  */
+extern void decode_g_option		(const char *);
+
 /* Return true iff flags are set as if -ffast-math.  */
 extern bool fast_math_flags_set_p	(void);