How do I designate which compiler is called when running cmake + make? - c++

Question

I'm trying to compile a c++ project with cmake and make on OSX but it looks like make is using CXX or clang when I want to use g++ (gcc) so I can follow the answer here to tell the compiler where to find header files (#includes) for tbb used in the project: Need help getting intel TBB working?
brew list shows that I have up to date versions of cmake, make, gcc, and swig installed.
Here's the project I'm trying to compile for reference: https://github.com/nmoehrle/mvs-texturing/blob/master/README.md

Answer 1

I came across this related answer and was able to get the project working! MacOS, CMake and OpenMP
I updated the cmakelists.txt with the following commands to set llvm as the compiler. Note, I needed to update the llvm file path to match the version number I have installed.
set(CMAKE_C_COMPILER "/usr/local/Cellar/llvm/5.0.1/bin/clang")
set(CMAKE_CXX_COMPILER "/usr/local/Cellar/llvm/5.0.1/bin/clang++")
set(OPENMP_LIBRARIES "/usr/local/Cellar/llvm/5.0.1/lib")
set(OPENMP_INCLUDES "/usr/local/Cellar/llvm/5.0.1/include")
Then I was also having issues with OpenMP so I added this section to configure the OpenMP include directories and link directories.
if (OPENMP_FOUND)
include_directories("${OPENMP_INCLUDES}")
link_directories("${OPENMP_LIBRARIES}")
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
endif(OPENMP_FOUND)
I'm a novice dev and wish I had more insight into why this worked but it fixed my issues!