[CMake] MSVC variable doesn't work without project() call first

[Robert Dailey]

On Tue, Nov 1, 2011 at 10:43 AM, David Cole <david.cole at kitware.com> wrote:

> On Tue, Nov 1, 2011 at 11:22 AM, Alexander Neundorf
> <a.neundorf-work at gmx.net> wrote:
> > On Tuesday 01 November 2011, Robert Dailey wrote:
> >> For some reason the built in variable like MSVC_VERSION and MSVC do not
> >> have any value unless the project() command is called first. Can someone
> >> explain why?
> >
> > Without checking...
> > IIRC, the project() call enables by default the C and the CXX languages
> (if
> > that hasn't been done before explicitely).
> > During enabling the languages the compilers are detected, and with them
> those
> > variables are set.
> > So, before that no languages are known to cmake, so these variables are
> not
> > set.
> >
> > Alex
> > --
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>
> Alex is right.
>
> If you need the value of MSVC *before* calling the project command for
> some reason, then you can call enable_language(C) (or CXX) instead...


I don't need MSVC checking before project() in my case, they just seemed
unrelated so I wanted to check for educational purposes :)

Thanks guys.
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