[CVS gcc toplevel patch] v2 + v3, --enable-libstdcxx-v3

[Benjamin Kosnik]

> Seems like you might as well just use one macro, and set it to
> "target-libstdc++-v3" or "target-libstdc++ target-libio".

true

> Configuring with --enable-libstdcxx-v3 should change the default for
> -fhonor-std, not just how libgcc is built; otherwise, if the user forgets
> to specify -fhonor-std, her code won't link.

I agree that this is preferable. I just am unsure as to how it can be done. 
I'm trying to match the behavior of --enable-new-gxx-abi, which also only 
sets flags for libgcc.a compilation instead of actually changing the 
compiler defaults. 

. . . . the only idea I have is to change decl2.c to

int flag_honor_std = _GPP_ENABLE_NAMESPACES;

from 

int flag_honor_std;

And then AC_DEFINE(_GPP_ENABLE_NAMESPACES) in gcc/configure.in when 
--enable-libstdcxx-v3 is called. Hmm. 



Or something like this. ........... I'll hack around a bit more.

-benjamin