X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-0.1 required=5.0 tests=BAYES_40,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: sourceware.org MIME-Version: 1.0 Date: Mon, 24 May 2010 14:19:21 -0400 Message-ID: Subject: cygwin-1.7.5: intptr_t/uintptr_t types and PRI?PTR/SCI?PTR format specfiers are inconsistent From: Matthew Fluet To: cygwin@cygwin.com Content-Type: text/plain; charset=ISO-8859-1 X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com /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@fenrirvm-win7 tmp]$ cat z.c #include #include 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@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@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' -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple