Add/include a Cmake that finds a package into CMake

Question

I found this CMake to find OpenBLAS but I can't find a way how to include that as an external file.

What I have in mind is like #include in C/C++. I tried googling bit i get the answer on how to include a project into CMake.

The main reason for this is that I want to have my CMake as clean and as small as possible since this is the fist time I am diving deeper in CMake world.

Answer 1

but I can't find a way how to include that as an external file.

You need:

1. Save the module (FindOpenBLAS.cmake) inside your project, for example:

   Project
   └── cmake
       └── Modules
           └── FindOpenBLAS.cmake
   

2. Add the path into CMake variable inside CMakeLists.txt:

   set (CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake/Modules/")
   

3. Add find_package directive inside CMakeLists.txt:

   find_package (OpenBLAS REQUIRED)  
   

4. Use populated variables, for example inside CMakeLists.txt:

   include_directories (${OpenBLAS_INCLUDE_DIR})
   ...
   target_link_libraries (${OpenBLAS_LIB})