7.5.4.1 guile: main and inner_main procedures

When the main-type is specified to be guile, a main() procedure is generated that calls gh_enter(), providing it with a generated inner_main() to invoke. If you must perform certain tasks before calling gh_enter(), you may specify such code in the value for the before-guile-boot attribute.

The inner_main() procedure itself will process the command line arguments (by calling optionProcess(), see libopts-optionProcess), and then either invoke the code specified with the guile-main attribute, or else export the parsed options to Guile symbols and invoke the scm_shell() function from the Guile library. This latter will render the program nearly identical to the stock guile(1) program.