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# sets HAVE_ATOMICS, checks for :
# - C++11 std::atomic: HAVE_CXX_STDATOMIC
# - C11 stdatomic: HAVE_C_STDATOMIC
# - builtin __atomic: HAVE_BUILTIN_ATOMIC
# - builtin __sync: HAVE_BUILTIN_SYNC
# - atomic_add_nv: HAVE_ATOMIC_ADD_NV
configure_define(HAVE_ATOMICS)
check_cxx_source("
#include <atomic>
int main() {
std::atomic<int> i(0);
return atomic_load(&i);
}"
HAVE_CXX_STDATOMIC)
check_c_source("
#include <stdatomic.h>
int main() {
atomic_int i;
atomic_init(&i, 0);
return atomic_load(&i);
}"
HAVE_C_STDATOMIC)
configure_define(HAVE_BUILTIN_ATOMIC)
configure_define_literal(BUILTIN_ATOMIC_PREFIX)
foreach(BUILTIN_ATOMIC_PREFIX IN ITEMS __c11 _ "")
check_c_source("
int main() {
long l = -1;
return ${BUILTIN_ATOMIC_PREFIX}_atomic_add_fetch(&l,1,__ATOMIC_RELAXED);
}"
HAVE_BUILTIN_ATOMIC${BUILTIN_ATOMIC_PREFIX})
if (HAVE_BUILTIN_ATOMIC${BUILTIN_ATOMIC_PREFIX})
set(HAVE_BUILTIN_ATOMIC 1)
break()
endif()
endforeach()
check_c_source("
int main() {
long l = -1;
return __sync_add_and_fetch(&l,1);
}"
HAVE_BUILTIN_SYNC)
check_c_source("
#include <atomic.h>
int main() {
volatile uint_t i = 0;
return atomic_add_int_nv(&i, 1) == 1 ? 0 : -1;
}"
HAVE_ATOMIC_ADD_NV)
if ( (HAVE_CXX_STDATOMIC)
OR (HAVE_C_STDATOMIC)
OR (HAVE_BUILTIN_ATOMIC)
OR (HAVE_BUILTIN_SYNC)
OR (HAVE_ATOMIC_ADD_NV))
set(HAVE_ATOMICS 1 CACHE INTERNAL "HAVE_ATOMICS")
endif()
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