[CMake] Does CMake 3.3.1 ignore CXX env variable on OSX10.10?

[Nils Gladitz]

On 09/22/2015 04:43 PM, Pere Mato Vila wrote:
> Hi Ben,
>
>    Thanks, but in my case CXX is already a full path (/usr/bin/clang++). It is set like this
>
>    export CXX=`which clang++`
>
>    I do not understand how  /usr/bin/clang++ gets converted to /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++

>> https://github.com/Kitware/CMake/commit/1f085e11e40a20f8e8702da7920e950e47deb27c

As the commit seems to explain the /usr/bin/clang++ binary is not the 
actual clang++ binary but rather an apple provided tool that delegates 
to the actual compiler depending on the current environment.

CMake runs "xcrun --find clang++" to find out which binary is currently 
the actual compiler.

This is done since CMake does not allow compilers to change once they 
have been configured given that this would invalidate information 
previously collected.

Nils