[CMake] Wrong cl.exe getting picked up

[James Bigler]

On Thu, Mar 15, 2012 at 1:30 PM, John Drescher <drescherjm at gmail.com> wrote:

> > OK, but it does try to fill in the CMAKE_C_COMPILER value.  What are you
> > suggesting?  That this is a bug or some kind of mistake on my part
> thinking
> > that the value in CMAKE_C_COMPILER is somehow relevant for Visual Studio
> > targets?
> >
>
> CMAKE_C_COMPILER is not used for Visual Studio targets
>

If that's the case then the value should never be defined or defined to
something like CMAKE_C_COMPILER-NOTFOUND or
CMAKE_C_COMPILER-NOTUSEDFORVISUALSTUDIO.

This behavior isn't documented anywhere, and even if it was documented it's
confusing to have the system define variables that it will never use.

James
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