[CMake] CHECK_INCLUDE_FILE_CXX with built from source compiler

[houssen]

Forgot to mention:

~> cmake --version
cmake version 3.5.0


Le 2017-03-13 19:33, houssen a écrit :
> Hello,
>
> I do NOT use /usr/bin/g++ that is installed in the system (long story
> - don't ask why).
> I compiled gcc from source and installed it in 
> /my/path/local/bin/g++.
>
> Now I need to check for tuple with CHECK_INCLUDE_FILE_CXX : it fails 
> !
>
> Still failing if:
> 1. I export CPLUS_INCLUDE_PATH to point at
> /my/path/local/include/c++/x.y.z (I checked: tuple is here)
> 2. set this before calling CHECK_INCLUDE_FILE_CXX :
>   SET ( CMAKE_REQUIRED_FLAGS "-I$ENV{CPLUS_INCLUDE_PATH}" )
>   SET ( CMAKE_REQUIRED_INCLUDES "$ENV{CPLUS_INCLUDE_PATH}" )
>
> What is wrong ?
>
> Franck