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Date: Mon, 07 Sep 2009 10:24:52 +0200 From: Peter Oberparleiter <oberpar@...ux.vnet.ibm.com> To: Amerigo Wang <amwang@...hat.com> CC: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, linux-kbuild@...r.kernel.org, Sam Ravnborg <sam@...nborg.org> Subject: Re: [RFC Patch 0/5] gcov: integrate gcov into kbuild Amerigo Wang wrote: > This patchset is mainly to integrate gcov into kbuild system, so that > we can use "make foo/bar.c.gcov" to get the gcov files. > Also moves the useful scripts in gcov.txt into tools/gcov/ direcotry. Interesting approach - this should definitely make it more easy for developers to get coverage data for their code. A couple of thoughts/observations: - does not work when compiling with a separate build directory (make O=) /sys/kernel/debug/gcov//mnt/out//mnt/linux-2.6.gcno:cannot open graph file make[2]: *** [init/main.c.gcov] Error 1 make[1]: *** [init/main.c.gcov] Error 2 make: *** [sub-make] Error 2 This is most likely due to target_base_name being an absolute path (relative to srctree) in case build and source directories are different. - gcov call should use option -p, otherwise gcov may overwrite .gcov files if a .c file includes two .h files from different directories. - an option to generate .gcov files for all .c files in a subdirectory would be nice Regards, Peter Oberparleiter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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