Re: [boost] [trippels-ppc64le][math] Missing quadmath.h errors

Subject: Re: [boost] [trippels-ppc64le][math] Missing quadmath.h errors
From: John Maddock (jz.maddock_at_[hidden])
Date: 2015-11-16 06:47:41

On 16/11/2015 10:48, Andrey Semashev wrote:
> Hi,
>
> I'm seeing some test failures on the trippels-powerpc64le-gcc-6.0 
> tester that amount to Boost.Math failing to build because the 
> quadmath.h header is missing.
>
> http://www.boost.org/development/tests/develop/developer/output/trippels-powerpc64le-gcc-6-0-boost-bin-v2-libs-log-test-filt_matches_spirit_qi-test-gcc-6-0-0-release-build-no-threading-multi.html 
>
>
> I understand that gcc 6.0 is an unreleased compiler, but the error is 
> probably not a consequence of a compiler bug. Besides, another tester, 
> Flast-FreeBSD10-gcc-6.0.0~gnu++11, passes. Is it possible that the 
> header is not provided for powerpc64le? Or is an optional dependency 
> whose presence is misdetected? Is this a known problem?
>

Not a known problem, no.

My understanding is that libquadmath is an integral part of GCC, and I 
see that BOOST_HAS_FLOAT128 is defined for that platform - and that's 
predicated on _GLIBCXX_USE_FLOAT128 so __float128 appears to be 
supported?  The GCC manual is a little unclear to me when this is 
supposed to be supported: 
https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html.

What happens on that platform with older (released) compilers?

Thanks, John.