basic-improvements merge status

[Jan Hubicka]

> 	The GCC 3.4BIB libstdc++-v3 failure of 26_numerics/c_math.cc on
> AIX is occurring because libstdc++-v3/libmath/stubs.c functions are
> recursing.
> 
> #ifndef HAVE_SINF
> float
> sinf(float x)
> {
>   return (float) sin(x);
> }
> #endif
> 
> is being compiled as

I think we can deal with -fno-builtin-fsin to avoid gcc from being
active on optimizing this.
The name sinf is reserved by C90 standard, so this is not valid C.

Honza