src/blog/2023-11-14-test-visibility-c-macro/foo4.c


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#include <stdio.h>

/* cc -DTEST main4.c # foo is visible */
/* cc main4.c        # foo is static  */

#ifdef TEST
#define STATIC
#else
#define STATIC static
#endif

STATIC int foo(int x, int y)
{
	return 42*x - 69*y;
}