Hi,

I recently updated KDE to 3.4.2, which also updated libstdc++ to
libstdc++6. After this update I tried to compile a project that has
compiled without problems before and got a bunch of undefined
references (see below). I recompiled mysql++ and updated binutils but
that had no effect.

Any ideas what could've caused this? I'm using g++ 4.0.2 on Debian.

-----
/usr/lib/libmysqlpp.so: undefined reference to
`std::__default_alloc_template<true, 0>::allocate(unsigned int)'
/usr/lib/libmysqlpp.so: undefined reference to
`std::basic_ostream<char, std::char_traits<char> >::seekp(long,
std::_Ios_Seekdir)'
/usr/lib/libmysqlpp.so: undefined reference to
`std::basic_streambuf<char, std::char_traits<char>
`std::basic_istream<char, std::char_traits<char> >::seekg(long,
std::_Ios_Seekdir)'
/usr/lib/libmysqlpp.so: undefined reference to
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
`std::basic_string<char, std::char_traits<char>, std::allocator<char>
`std::__default_alloc_template<true, 0>::deallocate(void*, unsigned
int)'
collect2: ld returned 1 exit status
-----

- Ville

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On Sat, Sep 24, 2005 at 03:34:54PM +0300, Ville Matilainen wrote:
Is g++ 4.0.x the only compiler on your system? If not, did you compile
mysql++ with the right one?

Did you compile mysql++ yourself? Or did you use the unstable package?
Is the version in /usr/lib the one you expect?

I'd double check your recompile of mysql++, since some assumption is probably
incorrect in that toolchain usage.

Also, double check your project build. Do you have multiple versions
of mysql++ installed? Perhaps one in /usr/local?

Just some questions off the top of my head. I'm successfully compiling
mysql++ here with g++ 4.0.1, so it's likely just a bug in your build
process for mysql++ or your project.

- Chris


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Ville,

I don't know if the update binutils are necessary. I've experienced the
same problems you have (with various other C++ libs as well), and the
problems disappeared when you recompiled the library. G++ 4.* seems to
have broken the C++ ABI (again), which is the basic cause of this.

Try to go back (Virtually impossible without just reinstalling and not
using testing or unstable), or when that's no option make meticulously
(sp?) sure that you've recompiled each and every c++ lib you're using
and that you're also linking with that lib.

I hope you get your app working,
Erwin
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erwin (AT) leastwanted (DOT) nl
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the promise for which it stands: one world, polycultural, genetically
engineered, with Internet access for all. -- Tonio Roque

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Well I got my project compiled, after I recompiled mysql++ using
g++-3.4. But now when I try to execute my app it says it can't find
the mysqlpp library! The examples that came with mysql++ work, but my
project doesn't. This isn't a mysql++ related problem anymore, so I
won't bother you with it.

Thank you for your help!

- Ville

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Ville Matilainen wrote:
You probably installed it in a directory your dynamic linker cannot
find. On Linux, for instance, you may have to edit /etc/ld.so.conf and
re-run ldconfig to get it working.

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On Mon, Sep 26, 2005 at 11:26:24AM -0600, Warren Young wrote:
Or if it's a really temporary path, set LD_LIBRARY_PATH.

- Chris


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You are correct. I got it working yesterday. I edited the file you
mentioned and also modified LD_LIBRARY_PATH and LD_RUN_PATH.

Warren Young wrote:


- Ville

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