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cmake: fix clan openmp build on windows

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This commit is contained in:
zdenop 2019-11-01 09:28:51 +01:00
parent a5716692b2
commit dbcff0ae88
1 changed files with 21 additions and 6 deletions
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27
CMakeLists.txt
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@ -146,10 +146,26 @@ if(CLANG) # clang all platforms
endif()
if (OPENMP_BUILD)
if (MSVC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /openmp")
else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
find_package(OpenMP QUIET)
if (OpenMP_FOUND)
message(">> ${OpenMP_FOUND} ${OpenMP_VERSION}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
add_library(OpenMP::OpenMP_CXX IMPORTED INTERFACE)
endif()
# https://stackoverflow.com/questions/12399422/how-to-set-linker-flags-for-openmp-in-cmakes-try-compile-function
if (NOT OpenMP_FOUND AND CLANG AND WIN32)
# workaroung because find_package(OpenMP) does not work for clang-cl
# https://gitlab.kitware.com/cmake/cmake/issues/19404
check_include_file_cxx(omp.h HAVE_OMP_H_INCLUDE)
find_library(OpenMP_LIBRARY NAMES omp libomp.lib)
message(">> OpenMP_LIBRARY: ${OpenMP_LIBRARY}")
if (MSVC)
set(OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS} /openmp")
else()
set(OpenMP_CXX_FLAGS "${OpenMP_CXX_FLAGS} -fopenmp")
endif()
set(OpenMP_FOUND 1)
add_definitions(-D_OPENMP=201107) # 3.1 version is supported from Clang 3.8.0
endif()
endif()
@ -459,8 +475,7 @@ endif()
if (WIN32 AND CLANG AND OPENMP_BUILD)
# Workaround for "libomp.lib is not automatically added on Windows"
# see: http://lists.llvm.org/pipermail/openmp-dev/2015-August/000857.html
# TODO: Find better way how to set Clang OpenMP library for linking on Windows
target_link_libraries (libtesseract PRIVATE "c:\\Program Files\\LLVM\\lib\\libomp.lib")
target_link_libraries (libtesseract PRIVATE ${OpenMP_LIBRARY})
endif()
########################################