I've had this problem too. The effect was the <source>.gcno file never showing up for object compilation.
I think a reasonable workaround is to simply pass profiling-enabled builds to a real compiler, rather than trying to cache them. Frediano Ziglio provides some details at http://lists.samba.org/archive/ccache/2006q1/000216.html Based on that, I created a really dumb/simple patch for the Debian package to pass profiling-enabled builds to the compiler. It is attached. -- \0
diff -ru ccache-2.4/ccache.c ccache-2.4-tp/ccache.c
--- ccache-2.4/ccache.c 2007-05-20 03:14:19.000000000 +1000
+++ ccache-2.4-tp/ccache.c 2007-05-20 03:17:54.000000000 +1000
@@ -641,6 +641,9 @@
/* these are too hard */
if (strcmp(argv[i], "-fbranch-probabilities")==0 ||
+ strcmp(argv[i], "-fprofile-arcs") == 0 ||
+ strcmp(argv[i], "-ftest-coverage") == 0 ||
+ strcmp(argv[i], "--coverage") == 0 ||
strcmp(argv[i], "-M") == 0 ||
strcmp(argv[i], "-MM") == 0 ||
strcmp(argv[i], "-x") == 0) {
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