Re: [RFC Patch 0/5] gcov: integrate gcov into kbuild

From: Amerigo Wang
Date: Mon Sep 07 2009 - 05:57:28 EST

Peter Oberparleiter wrote:
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.

Hmm, yeah, I will fix it.

- 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

Nice idea! I will add this.

Thank you, I will update and resend them!
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