/usr/include/stdint.h typedefs intptr_t as "int" and uintptr_t as
"unsigned int".
/usr/include/inttypes.h #defines PRIdPTR as "ld" and PRIoPTR as "lo".
These and the other PRI?PTR and SCN?PTR format specifiers are meant to
be used for the intptr_t and uintptr_t types (thus, making them usable
without needing to know their exact type definitions).
This inconsistency leads to warnings from gcc. (There is also a
potential calling-convention mismatch, though not on x86.)
[...@fenrirvm-win7 tmp]$ cat z.c
#include <stdio.h>
#include <inttypes.h>
int main(int argc, const char* arg[]) {
printf("&argc = 0x%08"PRIdPTR"\n", (intptr_t)(&argc));
printf("&argc = 0x%08"PRIxPTR"\n", (uintptr_t)(&argc));
return 0;
}
[...@fenrirvm-win7 tmp]$ gcc-3 -Wall z.c
z.c: In function `main':
z.c:6: warning: long int format, int arg (arg 2)
z.c:6: warning: long int format, int arg (arg 2)
z.c:7: warning: long unsigned int format, unsigned int arg (arg 2)
z.c:7: warning: long unsigned int format, unsigned int arg (arg 2)
[...@fenrirvm-win7 tmp]$ gcc-4 -Wall z.c
z.c: In function `main':
z.c:6: warning: format `%08ld' expects type `long int', but argument 2
has type `int'
z.c:6: warning: format `%08ld' expects type `long int', but argument 2
has type `int'
z.c:7: warning: format `%08lx' expects type `long unsigned int', but
argument 2 has type `unsigned int'
z.c:7: warning: format `%08lx' expects type `long unsigned int', but
argument 2 has type `unsigned int'
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