[Bug 885927] Re: g++ fails to link when using the -flto switch
Matthias Klose
doko at ubuntu.com
Fri Nov 4 15:24:47 UTC 2011
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fixed in -updates
** Changed in: binutils (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/885927
Title:
g++ fails to link when using the -flto switch
Status in “binutils” package in Ubuntu:
Fix Released
Bug description:
Any C++ program I tried to build with GCC failed with undefined
reference errors. As a test case, I have created a simple Hello World
program:
$ cat hello.cpp
#include <iostream>
int main()
{
std::cout << "Hello world!" << std::endl;
}
$ g++ -o hello hello.cpp -flto
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_GetDataRelBase at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_SetIP at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_RaiseException at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_GetLanguageSpecificData at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_GetRegionStart at GCC_3.0'
/lib/x86_64-linux-gnu/libc.so.6: undefined reference to `_dl_argv at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_DeleteException at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_SetGR at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_Resume at GCC_3.0'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_GetIPInfo at GCC_4.2.0'
/lib/x86_64-linux-gnu/libc.so.6: undefined reference to `_rtld_global_ro at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `__tls_get_addr at GLIBC_2.3'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_Resume_or_Rethrow at GCC_3.3'
/lib/x86_64-linux-gnu/libc.so.6: undefined reference to `_rtld_global at GLIBC_PRIVATE'
/lib/x86_64-linux-gnu/libc.so.6: undefined reference to `__libc_enable_secure at GLIBC_PRIVATE'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/libstdc++.so: undefined reference to `_Unwind_GetTextRelBase at GCC_3.0'
collect2: ld returned 1 exit status
Every C++ program I tried to build with -flto failed at link stage. C
programs compile without problems. A workaround is to add the
-B/usr/lib/gold-ld/ switch to the command line:
$ g++ -B/usr/lib/gold-ld/ -flto -o hello hello.cpp
$ # Success
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: binutils 2.21.53.20110810-0ubuntu4
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Thu Nov 3 21:43:56 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
LANGUAGE=pt_BR:pt:en
PATH=(custom, no user)
LANG=pt_BR.UTF-8
SHELL=/bin/bash
SourcePackage: binutils
UpgradeStatus: Upgraded to oneiric on 2011-10-15 (19 days ago)
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- Previous message: [Bug 885927] Re: g++ fails to link when using the -flto switch
- Next message: [Bug 885935] [NEW] Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 968, in simulate trans.unauthenticated = self._simulate_helper(trans) File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1092, in _simulate_helper return depends, self._cache.required_download, \ File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 235, in required_download pm.get_archives(fetcher, self._list, self._records) SystemError: E:I wasn't able to locate a file for the xsane-common package. This might mean you need to manually fix this package.
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