Re: Tracking down undefined reference errors.

James Kanze <>
Fri, 16 Nov 2007 03:08:51 -0800 (PST)
On Nov 16, 12:25 am, wrote:

On Nov 15, 12:53 pm, "BobR" <> wrote:

<> wrote in message...

then it is likely to assume the mangled names are not
resolving because the libraries were compiled with visual
studio as opposed to mingw/gcc? If that's the case, how
come some libraries (like SDL_image.lib) work? Is it
because they use simpler functions whose names don't get
mangled in an incompatible way?

Why not run 'nm' on the lib in question to see what's in it?
[ 'nm' is in the 'binutils' (MinGW) package. ]

(There's also a c++filt program somewhere which unmangles g++
mangled names.)

Here are the first few entries it spit out:


00000000 T ??0?$RefCounted@VBoundSlot@CEGUI@@@CEGUI@@QAE@ABV01@@Z


Not sure, but I think this is VC++ mangling. At any rate, g++
doesn't use the @ character in its mangling scheme (and I think
VC++ does). The names in your error message looked like they
might be g++ mangling.

You cannot link code compiled with g++ and code compiled with
VC++. The two compilers use different class layouts (different
organization of the vtable, etc.). If they happened to use the
same mangling, and you managed to link the code, it would only
crash when you tried to run the program. You have, basically,
two choices: compile your code with VC++, or compile the all of
the libraries you need with g++.

James Kanze (GABI Software)
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