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Rewrite FindAtomics.cmake.

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This commit is contained in:
levlam 2024-02-21 18:29:35 +03:00
parent 3967634933
commit 69908ae3c4
2 changed files with 33 additions and 30 deletions
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59
CMake/FindAtomics.cmake
View File

@ -7,9 +7,12 @@
# riscv64 specific:
# * https://lists.debian.org/debian-riscv/2022/01/msg00009.html
#
# ATOMICS_FOUND - system has c++ atomics
# ATOMICS_LIBRARIES - libraries needed to use c++ atomics
# ATOMICS_LIBRARY_FLAGS - flags required to link with c++ atomics library
# ATOMICS_FOUND - system has C++ atomics
# ATOMICS_LIBRARIES - libraries needed to use C++ atomics
if (ATOMICS_FOUND)
return()
endif()
include(CheckCXXSourceCompiles)
@ -17,40 +20,40 @@ include(CheckCXXSourceCompiles)
# to convert smaller atomics to those larger ones via masking and
# shifting like LLVM, but it’s a known bug that it does not. This means
# anything that wants to use atomics on 1-byte or 2-byte types needs
# -latomic, but not 4-byte or 8-byte (though it does no harm).
set(atomic_code
# to link atomic library, but not 4-byte or 8-byte (though it does no harm).
set(ATOMIC_CODE
"
#include <atomic>
#include <cstdint>
std::atomic<uint8_t> n8 (0); // riscv64
std::atomic<uint64_t> n64 (0); // armel, mipsel, powerpc
std::atomic<std::uint8_t> n8(0); // riscv64
std::atomic<std::uint64_t> n64(0); // armel, mipsel, powerpc
int main() {
++n8;
++n64;
return 0;
}")
check_cxx_source_compiles("${atomic_code}" ATOMICS_LOCK_FREE_INSTRUCTIONS)
set(ATOMICS_LIBS " " "-latomic")
if (ATOMICS_LOCK_FREE_INSTRUCTIONS)
set(ATOMICS_FOUND TRUE)
set(ATOMICS_LIBRARIES)
set(ATOMICS_LIBRARY_FLAGS)
else()
set(CMAKE_REQUIRED_LIBRARIES "-latomic")
check_cxx_source_compiles("${atomic_code}" ATOMICS_IN_LIBRARY)
set(CMAKE_REQUIRED_LIBRARIES)
if (ATOMICS_IN_LIBRARY)
set(ATOMICS_LIBRARY atomic)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Atomics DEFAULT_MSG ATOMICS_LIBRARY)
set(ATOMICS_LIBRARIES ${ATOMICS_LIBRARY})
set(ATOMICS_LIBRARY_FLAGS "-latomic")
unset(ATOMICS_LIBRARY)
else()
if (Atomics_FIND_REQUIRED)
message(FATAL_ERROR "Neither lock free instructions nor -latomic found.")
foreach (ATOMICS_LIBRARY ${ATOMICS_LIBS})
unset(ATOMICS_FOUND CACHE)
set(CMAKE_REQUIRED_LIBRARIES "${ATOMICS_LIBRARY}")
check_cxx_source_compiles("${ATOMIC_CODE}" ATOMICS_FOUND)
unset(CMAKE_REQUIRED_LIBRARIES)
if (ATOMICS_FOUND)
if (NOT ATOMICS_LIBRARY STREQUAL " ")
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Atomics DEFAULT_MSG ATOMICS_LIBRARY)
set(ATOMICS_LIBRARIES "${ATOMICS_LIBRARY}" CACHE STRING "Atomic library" FORCE)
else()
set(ATOMICS_LIBRARIES "" CACHE STRING "Atomic operations library" FORCE)
endif()
break()
endif()
endforeach()
if (Atomics_FIND_REQUIRED AND NOT ATOMICS_FOUND)
message(FATAL_ERROR "Atomic operations library isn't found.")
endif()
unset(atomic_code)
unset(ATOMICS_LIBRARY)
unset(ATOMICS_LIBS)
unset(ATOMIC_CODE)

4
CMakeLists.txt
View File

@ -133,8 +133,8 @@ include(TdSetUpCompiler)
td_set_up_compiler()
find_package(Atomics REQUIRED)
if (ATOMICS_LIBRARY_FLAGS)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ATOMICS_LIBRARY_FLAGS}")
if (ATOMICS_LIBRARIES)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ATOMICS_LIBRARIES}")
endif()
if (MSVC)