see what gcc and c++ generate for atomic builtins (NOT std::atomic)

atomic.c

#include <stdio.h>

// gcc -x c++ -std=c++11 -Wa,-adhln -g atomic.c > atomic.s
// gcc -std=c11 -Wa,-adhln -g atomic.c > atomic.s
int main(int argc, char **argv) {
    int foo = 0;
    int bar= 4711;

    printf("foo is: %d\n", foo);
    __atomic_store(&foo, &bar,__ATOMIC_SEQ_CST);
    printf("foo now: %d\n", foo);
    return 0;
}

Makefile

all: atomic-c++.s atomic-c.s atomic-c++ atomic-c

clean:
	rm -f atomic-c++.s atomic-c.s atomic-c++ atomic-c

atomic-c++.s: atomic.c
	gcc -x c++ -std=c++11 -Wa,-adhln -g  $^ > $@

atomic-c++: atomic.c
	gcc -x c++ -std=c++11 -g  $^ -o $@


atomic-c.s: atomic.c
	gcc -x c -std=c11 -Wa,-adhln -g  $^ > $@

atomic-c: atomic.c
	gcc -x c -std=c11 $^ -o $@