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(g-wrap.info)Coping With Old Guile Versions

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Coping With Old Guile Versions
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The guile interface for dealing with pointers was changed between
version 1.3 and subsequent releases (including 1.3.4), and g-wrap was
changed to use the new interface.  However, as some older distributions
still use guile 1.3 it has been necessary to keep the option of the old
interface available.  If you only use 1.3.4 or later versions of guile,
you can safely ignore this section.

To use the old interface, make sure the C constant GWRAP_OLD_GUILE_SMOB
is defined when compiling the generated C file.

If you are using autoconf, a macro AC_GWRAP_CHECK_GUILE, with no
arguments, is provided in g-wrap.m4.  It checkes which version of guile
is available, and if necessary sets  GWRAP_OLD_STYLE_SMOB.  If you use
it, make sure to include the line

     #undef GWRAP_OLD_STYLE_SMOB

in either acconfig.h, or config.h.in, depending on how you are using
autoconf.  Of course, if you do this, you must ensure config.h is
#included when you compile the generated C file!

For more details on autoconf see its extensive documentation.

NOTE: we can't guarantee that old versions of guile will be supported
forever.  We will try to ensure that most of the versions currently
being distributed work, but we're not in a position to keep multiple
layers of compatability code.