[bug #34608] comparison of unsigned expression < 0 is always false

[Sebastian Pipping]

Follow-up Comment #2, bug #34608 (project make):

Thanks for these details.  Let me propose

  #define INTEGER_TYPE_SIGNED(t) !((t) -1 > 0)

for a warning-less replacement then.  Like it?

Please re-open the bug for me, as I lack permissions to.

I used the program below with

  # gcc -Wall -Wextra main.c && ./a.out

as a test:

================================================================
#include <stdio.h>

#define INTEGER_TYPE_SIGNED(t) !((t) -1 > 0)

int main() {
        printf("signed %dn", INTEGER_TYPE_SIGNED(unsigned char));
        printf("signed %dn", INTEGER_TYPE_SIGNED(signed char));
        printf("signed %dn", INTEGER_TYPE_SIGNED(char));
        return 0;
}
================================================================


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