Index: Makefile.in
--- Makefile.in.orig	2004-09-13 12:38:30 +0200
+++ Makefile.in	2007-06-30 10:27:56 +0200
@@ -8,7 +8,9 @@
 INSTALLCMD=@INSTALL@
 
 CC=@CC@
-CFLAGS=@CFLAGS@ -I.
+CPPFLAGS=@CPPFLAGS@ -I.
+CFLAGS=$(CPPFLAGS) @CFLAGS@
+LDFLAGS=@LDFLAGS@
 EXEEXT=@EXEEXT@
 
 OBJS= ccache.o mdfour.o hash.o execute.o util.o args.o stats.o \
@@ -20,7 +22,7 @@
 docs: ccache.1 web/ccache-man.html
 
 ccache$(EXEEXT): $(OBJS) $(HEADERS)
-	$(CC) $(CFLAGS) -o $@ $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS)
 
 ccache.1: ccache.yo
 	-yodl2man -o ccache.1 ccache.yo
Index: ccache.1
--- ccache.1.orig	2004-09-13 12:38:30 +0200
+++ ccache.1	2007-06-30 10:27:56 +0200
@@ -234,6 +234,16 @@
 incorrect setting of this debug info rarely causes problems\&. If you
 strike problems with gdb not using the correct directory then enable
 this option\&.
+.IP
+.IP "\fBCCACHE_NOHASH_SIZE_MTIME\fP"
+This tells ccache to not hash the real compiler's size and modification
+time. Normally this is the mechanism to detect compiler upgrades.
+There are situations however, where even though the compiler's size or
+modification time has changed you can safely use the cached objects
+(e.g. if as part of your build system the compiler is built as well
+and the compiler's source has not changed; or if the compiler has only
+changes that do not affect code generation). Use this feature only if
+you know what you are doing.
 .IP 
 .IP "\fBCCACHE_UNIFY\fP" 
 If you set the environment variable CCACHE_UNIFY
Index: ccache.c
--- ccache.c.orig	2004-09-13 12:38:30 +0200
+++ ccache.c	2007-06-30 10:27:56 +0200
@@ -158,9 +158,9 @@
 	struct stat st1, st2;
 	int status;
 
-	x_asprintf(&tmp_stdout, "%s/tmp.stdout.%s", temp_dir, tmp_string());
-	x_asprintf(&tmp_stderr, "%s/tmp.stderr.%s", temp_dir, tmp_string());
-	x_asprintf(&tmp_hashname, "%s/tmp.hash.%s.o", temp_dir, tmp_string());
+	x_asprintf(&tmp_stdout, "%s.tmp.stdout.%s", hashname, tmp_string());
+	x_asprintf(&tmp_stderr, "%s.tmp.stderr.%s", hashname, tmp_string());
+	x_asprintf(&tmp_hashname, "%s.tmp.%s", hashname, tmp_string());
 
 	args_add(args, "-o");
 	args_add(args, tmp_hashname);
@@ -331,8 +331,12 @@
 		hash_string(str_basename(args->argv[0]));
 	}
 
-	hash_int(st.st_size);
-	hash_int(st.st_mtime);
+	if (getenv("CCACHE_HASH_COMPILER")) {
+		hash_file(args->argv[0]);
+	} else if (!getenv("CCACHE_NOHASH_SIZE_MTIME")) {
+		hash_int(st.st_size);
+		hash_int(st.st_mtime);
+	}
 
 	/* possibly hash the current working directory */
 	if (getenv("CCACHE_HASHDIR")) {
@@ -640,6 +644,8 @@
 
 		/* these are too hard */
 		if (strcmp(argv[i], "-fbranch-probabilities")==0 ||
+		    strcmp(argv[i], "-coverage") == 0 ||
+		    strcmp(argv[i], "-ftest-coverage") == 0 ||
 		    strcmp(argv[i], "-M") == 0 ||
 		    strcmp(argv[i], "-MM") == 0 ||
 		    strcmp(argv[i], "-x") == 0) {
Index: ccache.h
--- ccache.h.orig	2004-09-13 12:38:30 +0200
+++ ccache.h	2007-06-30 10:27:56 +0200
@@ -6,11 +6,10 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <sys/stat.h>
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/mman.h>
-#include <sys/file.h>
 #include <fcntl.h>
 #include <time.h>
 #include <string.h>
@@ -19,6 +18,7 @@
 #include <stdarg.h>
 #include <dirent.h>
 #include <limits.h>
+#include <sys/file.h>
 #ifdef HAVE_PWD_H
 #include <pwd.h>
 #endif
Index: cleanup.c
--- cleanup.c.orig	2003-09-28 06:48:17 +0200
+++ cleanup.c	2007-06-30 10:27:56 +0200
@@ -57,6 +57,17 @@
 		free(p);
 		return;
 	}
+
+	if (strstr(fname, ".tmp.") != NULL) {
+		/* delete any tmp files older than 1 hour */
+		if (st->st_mtime + 3600 < time(NULL)) {
+			unlink(fname);
+			free(p);
+			return;
+		}
+	}
+
+
 	free(p);
 
 	if (num_files == allocated) {
Index: config.h.in
--- config.h.in.orig	2003-09-28 06:48:17 +0200
+++ config.h.in	2007-06-30 10:27:56 +0200
@@ -19,6 +19,9 @@
 /* Define to 1 if you have the `gethostname' function. */
 #undef HAVE_GETHOSTNAME
 
+/* Define to 1 if you have the `getpwuid' function. */
+#undef HAVE_GETPWUID
+
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
@@ -31,6 +34,9 @@
 /* Define to 1 if you have the <ndir.h> header file, and it defines `DIR'. */
 #undef HAVE_NDIR_H
 
+/* Define to 1 if you have the <pwd.h> header file. */
+#undef HAVE_PWD_H
+
 /* Define to 1 if you have the `realpath' function. */
 #undef HAVE_REALPATH
 
@@ -98,3 +104,8 @@
 
 /* Define _GNU_SOURCE so that we get all necessary prototypes */
 #undef _GNU_SOURCE
+
+/* Define on UNIX to activate XPG/5 features.  */
+#if !defined(_XOPEN_SOURCE)
+# define _XOPEN_SOURCE
+#endif
Index: util.c
--- util.c.orig	2004-09-13 12:38:30 +0200
+++ util.c	2007-06-30 10:27:56 +0200
@@ -151,7 +151,7 @@
 	vasprintf(ptr, format, ap);
 	va_end(ap);
 	
-	if (!ptr) fatal("out of memory in x_asprintf");
+	if (!*ptr) fatal("out of memory in x_asprintf");
 }
 
 /*
@@ -187,14 +187,10 @@
 {
 	void *p2;
 	if (!ptr) return x_malloc(size);
-	p2 = malloc(size);
+	p2 = realloc(ptr, size);
 	if (!p2) {
 		fatal("out of memory in x_realloc");
 	}
-	if (ptr) {
-		memcpy(p2, ptr, size);
-		free(ptr);
-	}
 	return p2;
 }
 
@@ -448,7 +444,7 @@
 		}
 	}
 #endif
-	fatal("Unable to determine home directory");
+	fprintf(stderr, "ccache: Unable to determine home directory");
 	return NULL;
 }