[cmake-developers] Identifying GNU C Compiler

[Rolf Eike Beer]

According to documentation you can use the following variable to check if your 
compiler is the GNU one:

 CMAKE_COMPILER_IS_GNU<LANG>

Well, this is actually only true for C++ as in CXX. If your language is C, 
then LANG is not C, but CC. If your language is Fortran, LANG is neither 
FORTRAN nor Fortran, but G77.

Confusing, isn't it?

Eike
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