From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7215 invoked by alias); 7 Oct 2011 01:30:40 -0000 Received: (qmail 7203 invoked by uid 22791); 7 Oct 2011 01:30:39 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 07 Oct 2011 01:30:25 +0000 From: "fzvqedi at v dot mintemail.com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/50646] New: configure detects big endian on little endian system. Date: Fri, 07 Oct 2011 01:30:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: fzvqedi at v dot mintemail.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-10/txt/msg00414.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50646 Bug #: 50646 Summary: configure detects big endian on little endian system. Classification: Unclassified Product: gcc Version: 4.5.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned@gcc.gnu.org ReportedBy: fzvqedi@v.mintemail.com checking whether byte ordering is bigendian... yes | int | main () | { | | /* Are we little or big endian? From Harbison&Steele. */ | union | { | long int l; | char c[sizeof (long int)]; | } u; | u.l = 1; | return u.c[sizeof (long int) - 1] == 1; | | ; | return 0; | } configure:8171: result: yes that test will return 0 on _little endian_ obviously the code was copypasted from a function isBigEndian(), but the author forgot that returning 0 in main means success. the reason it came so far is that configure dumbly added some stuff like #define ssize_t int to auto-host.h which caused all previous checks to err, because the libc just typedef'd those types, resulting in: error: two or more data types in declaration specifiers or error: 'long long long' is too long for GCC