Scheme 48 Manual | Contents | In Chapter: Mixing Scheme 48 and C
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Adding external modules to the Makefile

Getting access to C bindings from Scheme requires that the C code be compiled and linked in with the Scheme 48 virtual machine and that the relevant shared bindings be created. The Scheme 48 makefile has rules for compiling and linking external code and for specifying initialization functions that should be called on startup. There are three Makefile variables that control which external modules are included in the executable for the virtual machine (scheme48vm). EXTERNAL_OBJECTS lists the object files to be included in scheme48vm, EXTERNAL_FLAGS is a list of ld flags to be used when creating scheme48vm, and EXTERNAL_INITIALIZERS is a list of C procedures to be called on startup. The procedures listed in EXTERNAL_INITIALIZERS should take no arguments and have a return type of void. After changing the definitions of any of these variables you should do make scheme48vm to rebuild the virtual machine.

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