From owner-freebsd-toolchain@freebsd.org  Wed Feb 24 12:54:50 2016
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Subject: Re: clang -pg, libm and the _end symbol
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From: Dimitry Andric <dim@FreeBSD.org>
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To: Raphael Kubo da Costa <rakuco@FreeBSD.org>
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On 24 Feb 2016, at 12:27, Raphael Kubo da Costa <rakuco@FreeBSD.org> wrote:
> 
> I'm reviewing an update to the textproc/miller port in bug 207194, and
> noticed it does some ugly things in post-configure to seemingly
> work around the following problem (on 11-HEAD at least):
> 
> % echo 'int main(void) { return 0; }' > foo.c
> % clang -pg foo.c -lm
> /usr/bin/ld: undefined reference to symbol `_end' (try adding -lc)
> //lib/libc.so.7: could not read symbols: Bad value
> cc: error: linker command failed with exit code 1 (use -v to see
> invocation)

Try using: clang -pg foo.c -lm_p

That works for me (also with gcc).

-Dimitry


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