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Article #42624

Mixed G++ - GCC programs and Shared library

#42624
From: David M. Ronis
Date: Thu, 16 Nov 1995 00:00
38 lines
1767 bytes
I mainly program in C, but occasionally have to do calculations that
involve complex arithmetic.  I've found that C++'s operator
overloading conveniently allows me to basically take a C program, add
a few Complex and extern "C" {} statements, and create a C++ program
that includes complex mixed mode arithmetic. (At least it appears to
work to one who is not an experienced C++ programmer).

Recently, I've been working on a project that needs complex arithmetic
in only one of its modules.  The rest of the code is written in C and
is either included as .o files on the command line, or is in
libraries.

It is the code in the libraries that is giving me trouble.  When I
link, I get a slew of unresolved externals (usually variable
names). The library is sharable and was created for ELF format with
gcc(2.7.0) using -fpic.  If I include the source or compiled object
files explicitly on the gcc command line the problem goes away, but
this is a pain when a large number of modules are required.

I'm running Linux and have set things up for ELF targets.  I've also 
tried using
either 

	g++ $(CFLAGS) -o foo $(OBJS) -lmy_lib -lm

or
	gcc $(CFLAGS) -o foo $(OBJS) -lmy_lib -lm -lg++ -liostream

with the same results/problems.


Any help would be appreciated.


Thanks in advance.


David Ronis
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From: ronis@complex.is (David M. Ronis)
Subject: Mixed G++ - GCC programs and Shared library
Date: 1995/11/16
Message-ID: <gnusenet48adnp$r7c@sifon.cc.mcgill.ca>
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organization: McGill University
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