static/shared linking with C and C++

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#3552

From: Anon
Date: Tue, 19 Nov 2002 15:21

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My question relates to the complexities of cross-linking object files 
and libraries between C and C++ (specifically gcc and g++) compiled code.

Details: I'm developing a suite of Unix applications. Each app uses at 
least one shared library and at least one executable which links to it. 
I've also got a collection of utility routines in C which are used by 
the entire suite, including the shared libraries.

What I've been doing, and which works quite well, is to compile the 
utility routines into a little static library (libutil.a), making sure 
to compile with -fpic. This way executables can link to it statically, 
which I prefer for simplicity of delivery, and the shared libraries can 
do the same, in which case these symbols become part of the shlib. In 
the latter case I make the utility symbols private to the shlib with a 
version script.

Now I'm trying to add a program written in C++ to the suite. I find that 
if I compile libutil.a with gcc the C++ program can't link with it 
(unresolved references) and if I compile it with g++ the C programs 
can't use it. Do I need to keep two versions around or is there some 
magic switch I'm missing?

Thanks in advance
DD

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