Date: Tue, 07 Sep 2004 22:20:35 -0400 From: "Mark W. Krentel" <krentel@dreamscape.com> To: freebsd-hackers@freebsd.org Subject: kernel profiling with kernbb and gcov Message-ID: <200409080220.i882KZ7W022214@blue.mwk.domain>
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I'm trying to do kernel profiling with kernbb(8) and gcov(1), but I can't get the kernel compile to accept the -ftest-coverage and -fprofile-arcs options. (1) Is it --test-coverage or -ftest-coverage, or does it matter? kernbb(8) says the former, gcov(1) says the latter. (2) How do I add these options to the kernel compile? I tried adding them to COPTFLAGS in make.conf, and all the individual files compile ok, but when it tries to link them, it dies with a bazillion undefined references. ffsl.o(.text+0x7e): In function `global constructors keyed to ffsl_GCOV': : undefined reference to `__gcov_init' ffsl.o(.data+0x44): undefined reference to `__gcov_merge_add' flsl.o(.text+0x7e): In function `global constructors keyed to flsl_GCOV': : undefined reference to `__gcov_init' flsl.o(.data+0x44): undefined reference to `__gcov_merge_add' I can run "gcc -ftest-coverage -fprofile-arcs hello.c" for the "Hello, world" program, and it works and gcov(1) is happy, but I can't get these options into the kernel. (3) How do I selectively add these options to just some of the source files? Do I run config (or "config -p") and hand edit the Makefile, before "make depend && make"? This is in 6.0-CURRENT as of a few days ago. Thanks, --Mark
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