c++/8549: --pedantic-errors problems on RedHat 6.1

[Zack Weinberg]

bangerth@dealii.org writes:

>     So I think, the whole thing is attributable to the following:
>     Somewhen an extension in gcc was deprecated and the kernel
>     folks changed their header files accordingly.I think the
>     only way to make newer gccs work on these old systems
>     would be to fixinclude the respective header files, but I
>     doubt someone would like to put much energy in backporting
>     gcc to such old systems.

Note that the kernel has nothing to do with this.  The header
bits/mathinline.h is part of GNU libc.

zw