OpenMP is enabled whenever it is found in the system

[ilyapopov]

In CmakeLists.txt, if OpenMP is found on the system, it is unconditionally enabled:

amgcl/CMakeLists.txt

Lines 60 to 68 in c71ab45

	find_package(OpenMP)
	if (OPENMP_FOUND)
	target_compile_options(amgcl INTERFACE ${OpenMP_CXX_FLAGS})
	target_link_libraries(amgcl INTERFACE
	$<$<CXX_COMPILER_ID:GNU>:${OpenMP_CXX_FLAGS}>
	$<$<CXX_COMPILER_ID:Clang>:${OpenMP_CXX_FLAGS}>
	$<$<CXX_COMPILER_ID:Intel>:${OpenMP_CXX_FLAGS}>
	)
	endif ()

However, I may want to compile my application without OpenMP even though it is installed. Currently, there is no way to do that.

amgcl could define a CMake option to enable/disable use of OpenMP.

[ddemidov]

That is a good point, but I am currently away from keyboard for about two weeks, and so won't be able to implement it right away. I'll gladly accept a pull request though.

[ilyapopov]

No problem! I will try to make a PR in the coming days.