Public bug reported:
Binary package hint: lib64stdc++6
If you try to (cross)compile a c++ application on a i386 system for a
amd64 system then gcc will search the right version of libstdc++.so .
If you installed lib64stdc++6 you have this file but it with it will be
named /usr/lib64/libstdc++.so.6.0.13 and it will have a symlink to it
named /usr/lib64/libstdc++.so.6 but there is no libstdc++.so symlink .
So if you run "g++ -m64 what_you_want_to_compile.cpp" the compiler will
only find the libstdc++.so symlink that's pointing to the 32bit version
/usr/lib/libstdc++.so.6.0.13 and you will notice the following error:
/usr/bin/ld: skipping incompatible
/usr/lib/gcc/i486-linux-gnu/4.4.3/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible
/usr/lib/gcc/i486-linux-gnu/4.4.3/libstdc++.a when searching for -lstdc++
/usr/bin/ld: skipping incompatible
/usr/lib/gcc/i486-linux-gnu/4.4.3/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible
/usr/lib/gcc/i486-linux-gnu/4.4.3/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status
If you create a symlink "/usr/lib64/libstdc++.so" that points to libstdc++.so.6
(also in /usr/lib64) this problem is fixed.
g++ can now create 64bit executables on a 32 bit system. (and it can still
create 32 bit executables if you remove the -m64 option)
So the only thing that should happen is : the package lib64stdc++6
should install one more file with the following proporties "lrwxrwxrwx 1
root root 14 2010-08-28 15:44 /usr/lib64/libstdc++.so -> libstdc++.so.6"
The following is probably automaticly included but just in case it
isn't: I am using 10.04.1 LTS and the version of lib64stdc++6 is
4.4.3-4ubuntu5
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: lib64stdc++6 4.4.3-4ubuntu5
ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
Architecture: i386
CheckboxSubmission: 599e0ceddfe21469dfccfaf9e1ce596f
CheckboxSystem: 6846a698de8fa2198772bce0df24d7c6
Date: Sat Aug 28 15:47:24 2010
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
LANG=en_US.utf8
SHELL=/bin/bash
SourcePackage: gcc-4.4
** Affects: gcc-4.5 (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 lucid
--
Missing symlink causes problems crosscompiling c++ apps
https://bugs.launchpad.net/bugs/625839
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