libstdc++-v3 configure question

[Joern Rennecke]

> Do we want the libstdc++ configury process to specify -ansi when it runs
> the compiler?  Or should GCC always define _HPUX_SOURCE (seems wrong to me).
> Or should we hack up the g++ testsuite?  Or is there some other direction we
> want to go to fix this problem?

We could use fixincludes to enable the declarations that are useful for GNU
tools / libraries not only for _HPUX_SOURCE_, but also for some GNU specific
#define.