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#.rst:
# FindAtomic
# -----
# Finds the ATOMIC library
#
# This will define the following variables::
#
# ATOMIC_FOUND - system has ATOMIC
# ATOMIC_LIBRARIES - the ATOMIC libraries
#
# and the following imported targets::
#
# ATOMIC::ATOMIC - The ATOMIC library
include(CheckCXXSourceCompiles)
set(atomic_code
"
#include <atomic>
#include <cstdint>
std::atomic<uint8_t> n8 (0); // riscv64
std::atomic<uint64_t> n64 (0); // armel, mipsel, powerpc
int main() {
++n8;
++n64;
return 0;
}")
check_cxx_source_compiles("${atomic_code}" ATOMIC_LOCK_FREE_INSTRUCTIONS)
if(ATOMIC_LOCK_FREE_INSTRUCTIONS)
set(ATOMIC_FOUND TRUE)
set(ATOMIC_LIBRARIES)
else()
set(CMAKE_REQUIRED_LIBRARIES "-latomic")
check_cxx_source_compiles("${atomic_code}" ATOMIC_IN_LIBRARY)
set(CMAKE_REQUIRED_LIBRARIES)
if(ATOMIC_IN_LIBRARY)
set(ATOMIC_LIBRARY atomic)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Atomic DEFAULT_MSG ATOMIC_LIBRARY)
set(ATOMIC_LIBRARIES ${ATOMIC_LIBRARY})
if(NOT TARGET ATOMIC::ATOMIC)
add_library(ATOMIC::ATOMIC UNKNOWN IMPORTED)
set_target_properties(ATOMIC::ATOMIC PROPERTIES
IMPORTED_LOCATION "${ATOMIC_LIBRARY}")
endif()
unset(ATOMIC_LIBRARY)
else()
if(Atomic_FIND_REQUIRED)
message(FATAL_ERROR "Neither lock free instructions nor -latomic found.")
endif()
endif()
endif()
unset(atomic_code)
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