Tool that can launch the native build system.
The value may be the full path to an executable or just the tool
name if it is expected to be in the PATH.
The tool selected depends on the CMAKE_GENERATOR used
to configure the project:
The Makefile Generators set this to make, gmake, or
a generator-specific tool (e.g. nmake for NMake Makefiles).
These generators store CMAKE_MAKE_PROGRAM in the CMake cache
so that it may be edited by the user.
The Ninja generator sets this to ninja.
This generator stores CMAKE_MAKE_PROGRAM in the CMake cache
so that it may be edited by the user.
The Xcode generator sets this to xcodebuild.
This generator prefers to lookup the build tool at build time
rather than to store CMAKE_MAKE_PROGRAM in the CMake cache
ahead of time. This is because xcodebuild is easy to find.
For compatibility with versions of CMake prior to 3.2, if
a user or project explicitly adds CMAKE_MAKE_PROGRAM to
the CMake cache then CMake will use the specified value.
The Visual Studio Generators set this to the full path to
MSBuild.exe or devenv.com.
(See also variables
CMAKE_VS_MSBUILD_COMMAND and
CMAKE_VS_DEVENV_COMMAND.
These generators prefer to lookup the build tool at build time
rather than to store CMAKE_MAKE_PROGRAM in the CMake cache
ahead of time. This is because the tools are version-specific
and can be located using the Visual Studio Installer. It is also
necessary because the proper build tool may depend on the
project content (e.g. the Intel Fortran plugin to Visual Studio
requires devenv.com to build its .vfproj project files
even though MSBuild.exe is normally preferred to support
the CMAKE_GENERATOR_TOOLSET).
For compatibility with versions of CMake prior to 3.0, if
a user or project explicitly adds CMAKE_MAKE_PROGRAM to
the CMake cache then CMake will use the specified value if
possible.
The Green Hills MULTI generator sets this to the full
path to gbuild.exe(Windows) or gbuild(Linux) based upon
the toolset being used.
Once the generator has initialized a particular value for this variable, changing the value has undefined behavior.
The CMAKE_MAKE_PROGRAM variable is set for use by project code.
The value is also used by the cmake --build and
ctest --build-and-test tools to launch the native
build process.