Build problems with glibc 2.26

[Alexander Monakov]

On Thu, 10 Aug 2017, Jonathan Wakely wrote:
> On 10 August 2017 at 13:05, Rolf Eike Beer wrote:
> > I'm trying to build gcc 5.4.0 together with glibc 2.26. It is a cross-build to
> > both AMD64 or i686 that shows problems, while ARM works. (For those who want
> > to suggest a newer gcc first: no, doesn't work: https://gcc.gnu.org/bugzilla/
> > show_bug.cgi?id=70936).
> >
> > The problem arises from this output of configure of libgomp:
> >
> > checking for ISO C99 support in <math.h>... no
> 
> You need to look at libgomp/config.log and see why this happens.

Note there's an issue with (just recently released) glibc 2.26 and libstdc++
that looks related, but root cause may be different as libgomp doesn't use C++:
https://sourceware.org/bugzilla/show_bug.cgi?id=21930

Alexander