[CMake] Alternate compiler specific options - how to specify?

[Rolf Eike Beer]

Miller Henry wrote:
> We are using cmake 2.8.11 for out project.
> 
> Our local compiler is gcc-4.4.3.  There is desire to use a newer compiler,
> but we are not yet ready to commit to anything yet.  In the mean time we
> have installed binaries gcc-4.7 and gcc-4.8.  We can specify the alternate
> compiler with -DCMAKE_C_COMPILER=gcc-4.7, but we want to go a step farther:
>  one (believed important) advantage of gcc-4.7 is the option -mtune=atom
> since that is are target system. We want to force this option when using
> the newer compiler, but the older version of gcc doesn't accept it.

cmake --help-module CheckCCompilerFlag

Eike
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