On 2012-03-02, at 2:33 PM, Patrick Bene wrote:

Hello,

I'm trying to mix Gambit Scheme with C++ code and want to know the best way of going about it. My goal is to compile into an executable where the C++ code contains the main function, and also exports some functions for the Scheme code to use.

What is the best way to do this?

Thanks.

There's an example in the Gambit distribution (the file misc/simple-make-project.tgz) which shows how to mix Gambit Scheme compiled code with a C "main" function. I also provides a generic "makefile", easily modified for your particular needs (I am copying it below). If you are interested in mixing with C++, the same example will work, just make sure you use the --enable-cplusplus when you configure Gambit. Marc # Simple makefile for project built with Gambit-C system. # Copyright (c) 2010 by Marc Feeley, All Rights Reserved. # This makefile is designed to depend only on the gsc compiler. The # gsc compiler will invoke the appropriate C compiler and linker, even # for compiling the C source files of the project. This makes this # makefile very portable as many system dependencies have been taken # care of when Gambit was installed. If gsc isn't installed in a # standard location, define GSC accordingly here: GSC = gsc # You should redefine C_MODULES and SCHEME_MODULES as needed for your # project. Define ALL_MODULES_O as the set of object files for the C # and Scheme modules. Define PROG_NAME as the program name. PROG_NAME = prog C_MODULES = mod1.c mod2.c main.c SCHEME_MODULES = mod3.scm mod4.scm SCHEME_MODULES_C = mod3.c mod4.c ALL_MODULES_O = mod1.o mod2.o main.o mod3.o mod4.o # You may want to add stuff to CC_OPTIONS and LD_OPTIONS (directories # for header files, libraries, etc). You must keep -D___LIBRARY in # CC_OPTIONS so that the compiled Scheme code does not implement its # own "main" function (in the link file generated by gsc). CC_OPTIONS = -D___LIBRARY LD_OPTIONS = # The rest of the makefile shouldn't need to be modified. GSC_OPTIONS = -cc-options "$(CC_OPTIONS)" -ld-options "$(LD_OPTIONS)" #GSC_OPTIONS = -cc-options "$(CC_OPTIONS)" -ld-options "$(LD_OPTIONS)" -verbose ALL_MODULES_C = $(C_MODULES) $(SCHEME_MODULES_C) ALL_MODULES = $(C_MODULES) $(SCHEME_MODULES) .SUFFIXES: .SUFFIXES: .scm .c .o all: $(PROG_NAME) $(PROG_NAME): $(ALL_MODULES_O) $(PROG_NAME)_.o $(GSC) $(GSC_OPTIONS) -exe -o $@ $^ $(PROG_NAME)_.c: $(SCHEME_MODULES_C) $(GSC) -link -o $@ $^ .c.o: $(GSC) $(GSC_OPTIONS) -obj $^ .scm.c: $(GSC) $(GSC_OPTIONS) -c $^ run: $(PROG_NAME) ./$(PROG_NAME) clean: rm -f $(SCHEME_MODULES_C) $(ALL_MODULES_O) $(PROG_NAME)_.* $(PROG_NAME) # Note: It is possible to compile and link a program in a single # invocation of gsc but this is not recommended for large projects # which usually benefit from separate compilation. The command is: # # $(GSC) $(GSC_OPTIONS) -exe -o $(PROG_NAME) $(ALL_MODULES) # # Moreover, this requires changing the name of the link file in main.c # from prog_.c to mod4_.c (the name is derived from the last Scheme # source file in ALL_MODULES).