Public bug reported:
Source package: gcc-defaults
Problem:
g++ 4.2 and 4.3 does not produce valid precompiled headers. To
reproduce:
$ g++ --version
g++ (Ubuntu 4.3.3-5ubuntu4) 4.3.3
$ cat pch.h
#include <cmath>
$ g++ -c -x c++ -MT pch.h.gch -MD -MP -MF pch.h.dep -o pch.h.gch -O3
-fno-exceptions -fno-rtti -ffunction-sections -fdata-sections -W -Wall
-Werror -Wstrict-aliasing=2 -msse2 pch.h
$ file pch.h.gch
pch.h.gch: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped
The above is incorrect; it is almost as though g++ missed the -c option
and tried to link the header file (or something like that?) Of course,
trying to use this header fails:
$ cat foo.cpp
#include "pch.h"
$ g++ -c -o foo.o -O3 -fno-exceptions -fno-rtti -ffunction-sections
-fdata-sections -W -Wall -Werror -Wstrict-aliasing=2 -Winvalid-pch -msse2
foo.cpp
foo.cpp:1:17: error: pch.h.gch: not a PCH file
The above problems also occur with g++-4.2:
$ g++-4.2 --version
g++-4.2 (GCC) 4.2.4 (Ubuntu 4.2.4-5ubuntu1)
However, if I install g++-4.1, everything works as expected:
$ g++-4.1 -c -x c++ -MT pch.h.gch -MD -MP -MF pch.h.dep -o pch.h.gch -O3
-fno-exceptions -fno-rtti -ffunction-sections -fdata-sections -W -Wall
-Werror -Wstrict-aliasing=2 -msse2 pch.h
$ file pch.h.gch
pch.h.gch: GCC precompiled header (version 013) for C++
$ g++-4.1 -c -o foo.o -O3 -fno-exceptions -fno-rtti -ffunction-sections
-fdata-sections -W -Wall -Werror -Wstrict-aliasing=2 -Winvalid-pch -msse2
foo.cpp
<no errors>
$ lsb_release -rd
Description: Ubuntu 9.04
Release: 9.04
$ apt-cache policy g++
g++:
Installed: 4:4.3.3-1ubuntu1
Candidate: 4:4.3.3-1ubuntu1
Version table:
*** 4:4.3.3-1ubuntu1 0
500 http://gb.archive.ubuntu.com jaunty/main Packages
100 /var/lib/dpkg/status
$ apt-cache policy g++-4.2
g++-4.2:
Installed: 4.2.4-5ubuntu1
Candidate: 4.2.4-5ubuntu1
Version table:
*** 4.2.4-5ubuntu1 0
500 http://gb.archive.ubuntu.com jaunty/universe Packages
100 /var/lib/dpkg/status
$ apt-cache policy g++-4.1
g++-4.1:
Installed: 4.1.2-24ubuntu1
Candidate: 4.1.2-24ubuntu1
Version table:
*** 4.1.2-24ubuntu1 0
500 http://gb.archive.ubuntu.com jaunty/universe Packages
100 /var/lib/dpkg/status
$ uname -s -r -v -m -o
Linux 2.6.28-13-generic #44-Ubuntu SMP Tue Jun 2 07:55:09 UTC 2009 x86_64
GNU/Linux
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: g++
--
g++ does not produce valid precompiled headers
https://bugs.launchpad.net/bugs/394940
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