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Linking C++ with C

In order to link C procedures into C++ programs, you need to declare your C functions in your C++ programs by declaring them in your C++ file. An example is

	extern "C" {
	        double sqrt(double);

which declares sqrt to be a function that takes a double as an argument and returns a double. This information is needed so that C++ can check that your uses of this function have the correct type.

If you're using makefiles, you can have the files combined automatically. You'd could use a Makefile like:

	SRCS = foo.C bar.c
	OBJS = foo.o bar.o

	.C.o: ; $(C++) $(C++FLAGS) -c $<

	prog: $(OBJS)
		$(C++) $(C++FLAGS) -o prog $(OBJS) -lm

to link together "foo.C" (the c++ file) and "bar.c" (ordinary C) to make the executable program "prog".

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

February 11, 2009

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