X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-3.1 required=5.0 tests=AWL,BAYES_00,J_CHICKENPOX_83,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: sourceware.org Message-ID: <49BC958D.2080306@cwilson.fastmail.fm> Date: Sun, 15 Mar 2009 01:43:41 -0400 From: Charles Wilson User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.19) Gecko/20081209 Thunderbird/2.0.0.19 Mnenhy/0.7.6.666 MIME-Version: 1.0 To: cygwin@cygwin.com Subject: long unsigned int vs. uint32_t again Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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 Why does the following give me a warning (with -Wformat=2): uint32_t seconds = ... uint32_t minutes = ... uint32_t hours = ... snprintf(buf, sizeof(buf), "%" PRIu32 ":%02" PRIu32 ":%02" PRIu32, hours, minutes, seconds); warning: long unsigned int format, uint32_t arg (arg 4) warning: long unsigned int format, uint32_t arg (arg 5) warning: long unsigned int format, uint32_t arg (arg 6) If you've got a uint32_t, then 'PRIu32' is the correct code to use, right? What OTHER code could there be for printing unsigned, 32bit, integers? cygwin's has: #define PRIu8 "u" #define PRIu16 "u" #define PRIu32 "lu" #define PRIu64 "llu" and has typedef unsigned int uint32_t; This is on cygwin-1.7.0-43, with gcc-3.4.4-999. Is it possible that our inttypes.h should be changed, to use "u" for 8, 16, and 32 bits? Or is gcc's -Wformat=2 in 3.4.4 just too strict here -- and should be checking the actual bitwidths of types against the formats, before assuming that "lu" doesn't match uint32_t? -- Chuck -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/