[petsc-dev] libm autodetection broken with -ffast-math

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> On Wed, Apr 2, 2014 at 11:32 PM, Jed Brown <jed at jedbrown.org> wrote:
>
>> Barry Smith <bsmith at mcs.anl.gov> writes:
>>
>> >    Why not just always assume -lm is needed and only remove -lm if it
>> doesn't exist?
>>
>> That would be fine with me.
>
>
> How does this solve the problem? You might get an error from the linker if
> -lm is not found (maybe not),
> but you still cannot test that the symbols we expect to be there are
> actually there.

True, but that is C89 so it's where they are suppose to be.  It's
amazing how much easier our configure would be if vendors consistently
implemented the 25-year-old standards.  I think libm is relatively
conforming as these things go.
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