The following code:
#include <stdio.h>
#include <inttypes.h>
int main()
{
int32_t ival = 1;
uint32_t uval = 2;
printf("int = %"PRId32", uint = %"PRIu32".\n", ival, uval);
return 0;
}
when compiled with either gcc or clang on a 32-bit system and with the -Wall
flag produces the following warnings:
tmp.c: In function ‘main’:
tmp.c:9:5: warning: format ‘%ld’ expects argument of type ‘long int’, but
argument 2 has type ‘int32_t’ [-Wformat=]
printf("int = %"PRId32", uint = %"PRIu32".\n", ival, uval);
^
tmp.c:9:5: warning: format ‘%lu’ expects argument of type ‘long unsigned int’,
but argument 3 has type ‘uint32_t’ [-Wformat=]
tmp.c:9:5: warning: format ‘%ld’ expects argument of type ‘long int’, but
argument 2 has type ‘int32_t’ [-Wformat=]
tmp.c:9:5: warning: format ‘%lu’ expects argument of type ‘long unsigned int’,
but argument 3 has type ‘uint32_t’ [-Wformat=]
I'm not sure why the double report for this, but both gcc and clang do the same
thing. This looks to be an issue that is generated because a long is 32 bits on
a 32-bit system and in inttypes.h __have_long32 is likely defined and that is
forcing the use of the 'l' formats when that is incorrect for at least these
two 32 bit types.
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