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include(CheckCSourceCompiles)
include(CMakePushCheckState)
if(USE_DOUBLE)
set(type "int64_t")
else()
set(type "int32_t")
endif()
set(atomic_code "
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main() {
static volatile ${type} val = 0;
${type} u = __atomic_add_fetch(&val, 1, __ATOMIC_RELAXED);
if(u - 1 == 0) {
return 0;
}
return 1;
}
")
check_c_source_compiles("${atomic_code}" HAVE_ATOMIC_BUILTIN_NOLIB)
set(ATOMIC_LIB "")
if (HAVE_ATOMIC_BUILTIN_NOLIB)
set(HAVE_ATOMIC_BUILTIN HAVE_ATOMIC_BUILTIN_NOLIB)
else()
# Sometimes linking against libatomic is required for atomic ops, if
# the platform doesn't support lock-free atomics.
cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_LIBRARIES atomic)
check_c_source_compiles("${atomic_code}" HAVE_ATOMIC_BUILTIN)
cmake_pop_check_state()
set(ATOMIC_LIB "atomic")
endif()
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