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From: "Nach M. S." <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: gcc-3.3: -O3 is defining BIG_ENDIAN on little endian machines
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Date: Tue, 29 Mar 2005 00:28:43 +0200
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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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To: [EMAIL PROTECTED]
Subject: Bug#301877: gcc-3.3: -O3 is defining BIG_ENDIAN on little endian
machines
From: Falk Hueffner <[EMAIL PROTECTED]>
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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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