Bug#301877: marked as done (gcc-3.3: -O3 is defining BIG_ENDIAN on little endian machines)
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and subject line Bug#301877: gcc-3.3: -O3 is defining BIG_ENDIAN on little endian machines
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From: "Nach M. S." <n-a-c-h@users.sf.net>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: gcc-3.3: -O3 is defining BIG_ENDIAN on little endian machines
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Package: gcc-3.3
Version: 1:3.3.5-12
Severity: important
Here is a samle source file to demonstrate the problem:
#include <string.h>
#ifdef BIG_ENDIAN
#warning Your machine is big endian
#endif
When compiling with -O3, BIG_ENDIAN is defined on an x86 machine.
Without -O3 or without including string.h, BIG_ENDIAN is not defined.
Just to be clear, BUG_ENDIAN should not be defined, on an x86 machine
regardless of parameters or system includes made.
This bug has been found on multiple 3.3 and 3.4 versions of gcc.
It has been reported by my dev team to be found on Gentoo as well.
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (300, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.7-1-k7
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Versions of packages gcc-3.3 depends on:
ii binutils 2.15-5 The GNU assembler, linker and bina
ii cpp-3.3 1:3.3.5-12 The GNU C preprocessor
ii gcc-3.3-base 1:3.3.5-12 The GNU Compiler Collection (base
ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an
ii libgcc1 1:3.4.3-12 GCC support library
-- no debconf information
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>From falk@debian.org Sat May 21 08:17:50 2005
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To: 301877-done@bugs.debian.org
Subject: Bug#301877: gcc-3.3: -O3 is defining BIG_ENDIAN on little endian
machines
From: Falk Hueffner <falk@debian.org>
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Date: Sat, 21 May 2005 17:17:18 +0200
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Hi,
#ifdef BIG_ENDIAN is not the way to test endianness. You should use
#if __BYTE_ORDER == __BIG_ENDIAN.
--
Falk
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