[CMake] How does cmake "discover" Visual Studio C++ compilers?

[J Decker]

Is a registry setting...

6.0, 7.0, 7.1, 8.0, 9.0, 10.0,......
HKLM\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\14.0\InstallDir

HKLM\SOFTWARE\Wow6432Node\Microsoft\VCExpress\12.0\Setup\VC
HKLM\SOFTWARE\Wow6432Node\Microsoft\VCExpress\14.0\Setup\VC

On Mon, Feb 15, 2016 at 8:23 PM, Eric Erhardt
<Eric.Erhardt at microsoft.com> wrote:
> I am trying to get our continuous integration system working in a Windows
> Docker container.
>
>
>
> We use CMake along with the Visual C++ compilers shipped with VS 2015.
>
>
>
> I have installed cmake-3.4.3-win32-x86 on the windows container, and also VS
> 2015 community with just the '/InstallSelectableItems',
> 'NativeLanguageSupport_VC', so just the C++ tools are installed.
>
>
>
> However, when I run cmake -G "Visual Studio 14 2015 Win64", I first get:
>
>
>
> The C compiler identification is unknown
>
> The CXX compiler identification is unknown
>
>
>
>
>
> But then I try running it again, and then the compiler is picked up.
>
>
>
> I know the recommendation is “run cmake in a VS developer command prompt”,
> but I’m in a Docker container, so I can’t pick my command prompt.
>
>
>
> I’ve tried running vcvarsall.bat in the container during the build before
> calling cmake -G, but it doesn’t fix the issue.
>
>
>
> So my question is:  exactly what does cmake look for to pick up the VS
> compilers?  Does “cl.exe” need to be on the PATH?  Does a certain
> environment variable need to be set?  Or a registry setting?
>
>
>
> Thanks in advance,
>
> Eric Erhardt
>
>
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