[Boost-build] gcc visibility support patch

Subject: [Boost-build] gcc visibility support patch
From: Jürgen Hunold (juergen.hunold_at_[hidden])
Date: 2010-06-04 06:15:41

Hi !

I've attached a patch to add support for gcc-4.x "visibility" to Boost.Build. 
This will fix #2114.
It adds two new features, "visibility" and "visibility-inlines" which control 
the corresponding gcc flags. This is necessary because these flags are othogonal 
and control different behaviour. I've omitted   -fvisibility-ms-compat because 
this flags should not be used in new code and users can always specify those 
using <cxxflags>. See http://gcc.gnu.org/wiki/Visibility for details.

Comments welcome, this is work in progress and just a "works for me" draft.

Yours,

Jürgen
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