-fvisibility-inlines-hidden for x86-darwin builds

[Benjamin Kosnik]

I assume this means Apple is using the visibility support in 4.2+? If
so, any feedback on the implementation would be useful for the rest of
us. 

> 2006-10-23  Howard Hinnant  <hhinnant@apple.com>
> 
> 	* libstdc++-v3/configure, libstdc++-v3/acinclude.m4
> 	  Allow OPTIMIZE_CXXFLAGS to be set by configure.host.
> 	* libstdc++-v3/configure.host
> 	  Set OPTIMIZE_CXXFLAGS to -fvisibility-inlines-hidden
> 	  for x86/darwin

This is fine. Usually you don't include auto-generated files in the patch.

So, you'd have:

 	* libstdc++-v3/acinclude.m4:
 	  Allow OPTIMIZE_CXXFLAGS to be set by configure.host
	* libstdc++-v3/configure: Regenerated.

Please add a comment in acinclude.m4 about setting OPTIMIZE_CXXFLAGS in
configure.host.

best,
benjamin