The guile module can currently export wrapper files that use the guile GH interface or the SCM interface. This is controlled by an argument passed to swig. The "-gh" argument causes swig -to output GH code, and the "-scm" argument causes swig to output SCM code. Right now the "-gh" argument +to output GH code, and the "-scm" argument causes swig to output SCM code. Right now the "-scm" argument is the default. The "-scm" wrapper generation assumes a guile version >= 1.6 and has several advantages over the "-gh" wrapper generation including garbage collection and GOOPS support. -The "-gh" wrapper generation can be used for older versions of guile. Thus eventually -the guile GH wrapper code generation will be depreciated (as guile 1.6 and above become more common) and the -SCM interface will become the default. The SCM and GH interface differ greatly in how they store +The "-gh" wrapper generation can be used for older versions of guile. +The guile GH wrapper code generation is depreciated and the +SCM interface is the default. The SCM and GH interface differ greatly in how they store pointers and have completely different run-time code. See below for more info.
The GH interface to guile is deprecated. Read more about why in the