Date: Wed, 24 Feb 2016 15:19:54 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Dimitry Andric <dim@FreeBSD.org> Cc: Raphael Kubo da Costa <rakuco@FreeBSD.org>, freebsd-toolchain@freebsd.org Subject: Re: clang -pg, libm and the _end symbol Message-ID: <20160224131954.GP91220@kib.kiev.ua> In-Reply-To: <1CEB597F-1446-4E73-B5E2-5E5A4B3E9313@FreeBSD.org> References: <86povmbb7c.fsf@FreeBSD.org> <1CEB597F-1446-4E73-B5E2-5E5A4B3E9313@FreeBSD.org>
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On Wed, Feb 24, 2016 at 01:54:25PM +0100, Dimitry Andric wrote:
> 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).
It probably not quite works, in the sense that it resolves _end to
something not correctly provided by libm_p.a. In other words, sbrk(),
if used for anything, would be broken.
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