more thorough checking if BUILD_OMP may be enabled by default. we need the OpenMP runtime, too. (79b84c08) · Commits · 郑智淋 / lammps

cmake/CMakeLists.txt

+10 −2

Original line number	Diff line number	Diff line
		@@ -227,7 +227,15 @@ pkg_depends(USER-LB MPI)
		pkg_depends(USER-PHONON KSPACE)
		pkg_depends(USER-SCAFACOS MPI)

		# detect if we may enable OpenMP support by default
		set(BUILD_OMP_DEFAULT OFF)
		find_package(OpenMP QUIET)
		if(OpenMP_FOUND)
		check_include_file_cxx(omp.h HAVE_OMP_H_INCLUDE)
		if(HAVE_OMP_H_INCLUDE)
		set(BUILD_OMP_DEFAULT ON)
		endif()
		endif()

		# TODO: this is a temporary workaround until a better solution is found. AK 2019-05-30
		# GNU GCC 9.x uses settings incompatible with our use of 'default(none)' in OpenMP pragmas
		@@ -237,14 +245,14 @@ find_package(OpenMP QUIET)
		if ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.99.9))
		option(BUILD_OMP "Build with OpenMP support" OFF)
		else()
		option(BUILD_OMP "Build with OpenMP support" ${OpenMP_FOUND})
		option(BUILD_OMP "Build with OpenMP support" ${BUILD_OMP_DEFAULT})
		endif()

		if(BUILD_OMP)
		find_package(OpenMP REQUIRED)
		check_include_file_cxx(omp.h HAVE_OMP_H_INCLUDE)
		if(NOT HAVE_OMP_H_INCLUDE)
		message(FATAL_ERROR "Cannot find required 'omp.h' header file")
		message(FATAL_ERROR "Cannot find the 'omp.h' header file required for full OpenMP support")
		endif()
		set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
		set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")