From:	axlq AT unicorn DOT us DOT com (to comp.os.msdos.djgpp)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Calling C++ functions from C functions: how?
Date:	11 Jan 1999 02:50:56 GMT
Organization:	a2i network
Lines:	26
Message-ID:	<77boug$l58$1@samba.rahul.net>
NNTP-Posting-Host:	waltz.rahul.net
NNTP-Posting-User:	unicorn
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I have a library that contains several C modules and two C++ modules.
The C modules end in .c and the C++ modules end in .cc.  I'm using RHIDE
to build everything.  No special compiler options.

I also have a test program in C that calls these functions.

When I attempt to link my program to the library, the linker complains
that two functions called by the test program are undefined.  These two
functions happen to be the C++ ones in the library.

I'm trying to port a rather large application that uses mixed C and C++
functions, which compiled and ran fine under another compiler (ZTC).
But with DJGPP, I'm running into this problem with the linker.

Is there something I can do with a function prototype that tells the
compiler compiling a C module, "this function call is to a C++ function
in another module"?  It doesn't help to compile my test program as a C++
program, and invoking the compiler with -x c++ seems to corrupt
something in the object files.

I've been fighting this all day.  There has to be something simple I'm
just not seeing....

-Alex
If e-mail reply bounces, try alex at unicorn.us.com

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