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 bleft(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
.SUFFIXES: .C .o
.C.o: ; $(C++) $(C++FLAGS) -c $<
C++=g++
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".
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