Hash environment variables that affect the preprocessor output

2 files changed, 53 insertions, 1 deletions

diff --git a/ccache.c b/ccache.c
index 0af8c090..68f0acb1 100644
--- a/ccache.c
+++ b/ccache.c
@@ -949,6 +949,24 @@ calculate_object_hash(struct args *args, struct mdfour *hash, int direct_mode)
 	}
 
 	if (direct_mode) {
+		/* Hash environment variables that affect the preprocessor output. */
+		const char **p;
+		const char *envvars[] = {
+			"CPATH",
+			"C_INCLUDE_PATH",
+			"CPLUS_INCLUDE_PATH",
+			"OBJC_INCLUDE_PATH",
+			"OBJCPLUS_INCLUDE_PATH", /* clang */
+			NULL
+		};
+		for (p = envvars; *p != NULL ; ++p) {
+			char *v = getenv(*p);
+			if (v) {
+				hash_delimiter(hash, *p);
+				hash_string(hash, v);
+			}
+		}
+
 		if (!(sloppiness & SLOPPY_FILE_MACRO)) {
 			/*
 			 * The source code file or an include file may contain
diff --git a/test.sh b/test.sh
index 85f1baa4..5f33a671 100755
--- a/test.sh
+++ b/test.sh
@@ -3,7 +3,7 @@
 # A simple test suite for ccache.
 #
 # Copyright (C) 2002-2007 Andrew Tridgell
-# Copyright (C) 2009-2011 Joel Rosdahl
+# Copyright (C) 2009-2012 Joel Rosdahl
 #
 # This program is free software; you can redistribute it and/or modify it under
 # the terms of the GNU General Public License as published by the Free Software
@@ -1158,6 +1158,40 @@ EOF
     checkstat 'cache hit (direct)' 1
     checkstat 'cache hit (preprocessed)' 0
     checkstat 'cache miss' 1
+
+    ##################################################################
+    # Check that environment variables that affect the preprocessor are taken
+    # into account.
+    testname="environment variables"
+    $CCACHE -Cz >/dev/null
+    rm -rf subdir1 subdir2
+    mkdir subdir1 subdir2
+    cat <<EOF >subdir1/foo.h
+int foo;
+EOF
+    cat <<EOF >subdir2/foo.h
+int foo;
+EOF
+    cat <<EOF >foo.c
+#include <foo.h>
+EOF
+    backdate subdir1/foo.h subdir2/foo.h
+    CPATH=subdir1 $CCACHE $COMPILER -c foo.c
+    checkstat 'cache hit (direct)' 0
+    checkstat 'cache hit (preprocessed)' 0
+    checkstat 'cache miss' 1
+    CPATH=subdir1 $CCACHE $COMPILER -c foo.c
+    checkstat 'cache hit (direct)' 1
+    checkstat 'cache hit (preprocessed)' 0
+    checkstat 'cache miss' 1
+    CPATH=subdir2 $CCACHE $COMPILER -c foo.c
+    checkstat 'cache hit (direct)' 1
+    checkstat 'cache hit (preprocessed)' 0
+    checkstat 'cache miss' 2 # subdir2 is part of the preprocessor output
+    CPATH=subdir2 $CCACHE $COMPILER -c foo.c
+    checkstat 'cache hit (direct)' 2
+    checkstat 'cache hit (preprocessed)' 0
+    checkstat 'cache miss' 2
 }
 
 basedir_suite() {