I noticed a problem with tcc and _Generic that caused function pointers
with different return types to be treated as compatible which would prevent
the following code from compiling with the error "error: type match
twice".
I'm aware that the person who originally added _Generic support was aware
of this short coming and didn't fix it because that caused memmove and
other internal functions from compiling. I updated the return
types/declarations of such functions so that all current tests pass.
Minimal code snippet that didn't compile with tcc and will now compile:
#include <stdio.h>
#define G(P) _Generic(P, void(*)(int a):3, int(*)():0, void(*)(void):1, int
:2)
void bar(void) {}
int foo() {return 0;}
int foo2(int a) {return 0;}
void foo3(int a) {}
int main() {
printf("%d\n", G(1));
printf("%d\n", G(bar));
printf("%d\n", G(foo));
printf("%d\n", G(foo2));
printf("%d\n", G(foo3));
}
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