From:	alaric AT abwillms DOT demon DOT co DOT uk (Alaric B. Williams)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: C/C++ libraries. Any difference?
Date:	Thu, 31 Oct 1996 18:50:50 GMT
Lines:	39
Message-ID:	<846787710.25292.1@abwillms.demon.co.uk>
References:	<555rfu$maq AT nz12 DOT rz DOT uni-karlsruhe DOT de>
NNTP-Posting-Host:	abwillms.demon.co.uk
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

un1t AT rz DOT uni-karlsruhe DOT de (Matthias Baas) wrote:

>Hi,

>I have a problem with libraries and C/C++. Is there a difference
>between a library for C and a library for C++?

Yes... there's a difference, in fact, in the way the names of things
are stored in object files, library files, and debug information. It's
called C++ name mangling, and it basically means that the names
actually used have things stuck on the end.

For example:

int MyFunc(char *ch);

in C compiles to somethign called _MyFunc, whereas in C++ it ends up
looking more like _MyFunc^*£$£%some_garbage%^$"%...

To join C things to C++ things, use this syntax:

extern "C" int MyFunc(char *ch);

which tells the compiler you want to use the old C notation. If you go
through the header files for libpng and stick "C" after every Extern
you see, things should be nicer.


ABW
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Alaric B. Williams Internet : alaric AT abwillms DOT demon DOT co DOT uk
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