On Tue, 30 Aug 2011, Eric Botcazou wrote:

> This cleans up and documents the use of IN_GCC in the GNAT build system.

The mess of IN_GCC isn't at all GNAT-specific.  See what I said in 
<http://gcc.gnu.org/ml/gcc-patches/2010-10/msg00947.html>.  Beyond that, 
include/ansidecl.h tests IN_GCC to avoid defining some macros (which 
should be removed completely and unconditionally, but that may require 
fixing some users in the src repository).

-- 
Joseph S. Myers
jos...@codesourcery.com

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