Fixincludes patch for bug 23139

[Gabriel Dos Reis]

"Joseph S. Myers" <joseph@codesourcery.com> writes:

| This patch works around bug 23139 (errors from use of HUGE_VAL from
| old glibc headers in C++ with -pedantic) by fixincluding the problem
| definitions.  It adds a test to ensure that whatever subsequent fixes
| there may be, HUGE_VAL remains usable (and with the correct value)
| from C++ with -pedantic.  It also makes corresponding fixes and
| conditional tests for HUGE_VALF and HUGE_VALL.
| 
| There should still be more thorough fixes for the various underlying
| diagnostic issues, but this patch provides a fix now for 4.0 and 4.1
| (which could also be backported to 3.4).

I ran into similar bug when I was converting GCC to compile with a
C++ compiler.  However I think I underestimated the overall impact.
If you're willing to prepare a patch for 3.4.x -- after approval and
testing on 4.0.x for some time, then I'm willing to accept it.

-- Gaby