Index: ccache.c
===================================================================
--- ccache.c	(révision 7695)
+++ ccache.c	(copie de travail)
@@ -1029,6 +1029,14 @@
 		exit(1);
 	}
 
+	if (!getenv("CCACHE_READONLY")) {
+		if (create_cachedirtag(cache_dir) != 0) {
+			fprintf(stderr,"ccache: failed to create %s/CACHEDIR.TAG (%s)\n",
+				cache_dir, strerror(errno));
+			exit(1);
+		}
+	}
+
 	ccache(argc, argv);
 	return 1;
 }
Index: ccache.h
===================================================================
--- ccache.h	(révision 7695)
+++ ccache.h	(copie de travail)
@@ -81,6 +81,7 @@
 int copy_file(const char *src, const char *dest);
 
 int create_dir(const char *dir);
+int create_cachedirtag(const char *dir);
 void x_asprintf(char **ptr, const char *format, ...);
 char *x_strdup(const char *s);
 void *x_realloc(void *ptr, size_t size);
Index: util.c
===================================================================
--- util.c	(révision 7695)
+++ util.c	(copie de travail)
@@ -138,6 +138,39 @@
 	return 0;
 }
 
+char const CACHEDIR_TAG[] =
+	"Signature: 8a477f597d28d172789f06886806bc55\n"
+	"# This file is a cache directory tag created by ccache.\n"
+	"# For information about cache directory tags, see:\n"
+	"#	http://www.brynosaurus.com/cachedir/\n";
+
+int create_cachedirtag(const char *dir)
+{
+	char *filename;
+	struct stat st;
+	FILE *f;
+	x_asprintf(&filename, "%s/CACHEDIR.TAG", dir);
+	if (stat(filename, &st) == 0) {
+		if (S_ISREG(st.st_mode)) {
+			goto success;
+		}
+		errno = EEXIST;
+		goto error;
+	}
+	f = fopen(filename, "w");
+	if (!f) goto error;
+	if (fwrite(CACHEDIR_TAG, sizeof(CACHEDIR_TAG)-1, 1, f) != 1) {
+		goto error;
+	}
+	if (fclose(f)) goto error;
+success:
+	free(filename);
+	return 0;
+error:
+	free(filename);
+	return 1;
+}
+
 /*
   this is like asprintf() but dies if the malloc fails
   note that we use vsnprintf in a rather poor way to make this more portable