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Date: Mon, 24 May 2010 14:19:21 -0400
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Subject: cygwin-1.7.5: intptr_t/uintptr_t types and PRI?PTR/SCI?PTR format 	specfiers are inconsistent
From: Matthew Fluet <matthew DOT fluet AT gmail DOT com>
To: cygwin AT cygwin DOT com
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/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.)

[mtf AT 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;
}
[mtf AT 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)
[mtf AT 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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