Date: Tue, 14 Sep 2004 21:59:22 -0400 From: "Mark W. Krentel" <krentel@dreamscape.com> To: freebsd-current@freebsd.org Subject: kernel profiling with kernbb and gcov Message-ID: <200409150159.i8F1xMSb004864@blue.mwk.domain>
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I can't get kernel profiling with kernbb(8) and gcov(1) to work. The
kernel compile barfs with the -ftest-coverage and -fprofile-arcs
options.
(1) How do I add these options to the kernel build? 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.
(2) Is it --test-coverage or -ftest-coverage, or does it matter?
kernbb(8) says the former, gcov(1) says the latter.
(3) Is there some way to 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 from a week ago.
Thanks,
--Mark
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