[cfe-dev] [PATCH] preprocessor pragma push_macro support

[Francois Pichet]

Hi,

This patch implements the preprocessor #pragma push_macro/pop_macro
functionality (a microsoft extension but also supported by gcc). This
is required to make clang handles Windows/VS headers correctly. This
is my first contribution to clang and the C/C++ preprocessor is quite
complex so please review my patch.

My interest is to use clang to do code analysis on Visual Studio vcprojs.
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