how to call C++ from C?

From: Digital Puer (digital_puer_at_hotjail.comet)
Date: 01/10/04 

Date: Fri, 09 Jan 2004 16:28:17 -0800

I have some C++ code that I would like to call from within a C program
(main() is within the C code). How do I go about doing this portably?
I know that I can find the mangled name of the C++ functions, but
this is kind of weird.

I am using gcc and g++ on Linux, if that matters.

Here is an example of what I'm doing:

---------------------------------------------------
a.c:
---------------------------------------------------
#include "b.h"

int main()
{
   foo();
}

---------------------------------------------------
b.h
---------------------------------------------------
int foo();

---------------------------------------------------
b.cpp
---------------------------------------------------
#include <map>
int foo()
{
   map<int, int> m;

}

---------------------------------------------------
Makefile
---------------------------------------------------
a.out: a.o b.o
         g++ a.o b.o

a.o: a.c
         gcc -c a.c

b.o: b.cpp
         g++ -c b.cpp

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