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check for 32bit lib atomic

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badaix 2019-10-28 21:19:48 +01:00
parent ef36b406f5
commit 7d8e77cfc0
1 changed files with 34 additions and 36 deletions
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70
cmake/CheckAtomic.cmake
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@ -105,49 +105,47 @@ set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
endfunction(check_working_cxx_atomics64_2args) endfunction(check_working_cxx_atomics64_2args)
# This isn't necessary on MSVC, so avoid command-line switch annoyance # First check if atomics work without the library.
# by only running on GCC-like hosts. check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
# First check if atomics work without the library.
check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
# If not, check if the library exists, and atomics work with it.
if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB)
check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
if( NOT HAVE_LIBATOMIC )
check_working_cxx_atomics_2args(HAVE_LIBATOMIC_2ARGS)
endif()
if( HAVE_LIBATOMIC OR HAVE_LIBATOMIC_2ARGS )
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITH_LIB)
if (NOT HAVE_CXX_ATOMICS_WITH_LIB)
message(FATAL_ERROR "Host compiler must support std::atomic!")
endif()
else()
message(FATAL_ERROR "Host compiler appears to require libatomic, but cannot find it.")
endif()
endif()
endif()
# Check for 64 bit atomic operations.
if(MSVC)
set(HAVE_CXX_ATOMICS64_WITHOUT_LIB True)
else()
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
endif()
# If not, check if the library exists, and atomics work with it. # If not, check if the library exists, and atomics work with it.
if( NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB ) if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB)
check_library_exists(atomic __atomic_load_8 "" HAVE_CXX_LIBATOMICS64) check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
if( NOT HAVE_CXX_LIBATOMICS64 ) if( NOT HAVE_LIBATOMIC )
check_working_cxx_atomics_2args(HAVE_CXX_LIBATOMICS64_2ARGS) check_working_cxx_atomics_2args(HAVE_LIBATOMIC_2ARGS)
endif() endif()
if( HAVE_CXX_LIBATOMICS64 OR HAVE_CXX_LIBATOMICS64_2ARGS ) if( HAVE_LIBATOMIC OR HAVE_LIBATOMIC_2ARGS )
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic") list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITH_LIB) check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITH_LIB)
if (NOT HAVE_CXX_ATOMICS64_WITH_LIB) if (NOT HAVE_CXX_ATOMICS_WITH_LIB)
message(FATAL_ERROR "Host compiler must support std::atomic!") message(FATAL_ERROR "Host compiler must support std::atomic!")
endif() endif()
else() else()
message(FATAL_ERROR "Host compiler appears to require libatomic, but cannot find it.") # Check for 64 bit atomic operations.
if(MSVC)
set(HAVE_CXX_ATOMICS64_WITHOUT_LIB True)
else()
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
endif()
# If not, check if the library exists, and atomics work with it.
if( NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB )
check_library_exists(atomic __atomic_load_8 "" HAVE_CXX_LIBATOMICS64)
if( NOT HAVE_CXX_LIBATOMICS64 )
check_working_cxx_atomics_2args(HAVE_CXX_LIBATOMICS64_2ARGS)
endif()
if( HAVE_CXX_LIBATOMICS64 OR HAVE_CXX_LIBATOMICS64_2ARGS )
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITH_LIB)
if (NOT HAVE_CXX_ATOMICS64_WITH_LIB)
message(FATAL_ERROR "Host compiler must support std::atomic!")
endif()
else()
message(FATAL_ERROR "Host compiler appears to require libatomic, but cannot find it.")
endif()
endif()
endif() endif()
endif() endif()