Re: configuring apps for guile

[Jan Wedekind <jan@wedesoft.de>]

On Wed, 12 Feb 2020, Matt Wette wrote:

> Hi All,
>
> Over the last year I have been dealing with issues getting a configure.ac put 
> together
> for my guile app.  It needs to install .scm and .go files into the place 
> guile expects to
> see them: (%site-ccache-dir) and %load-path.   If I compile for my ubuntu 
> system then
> the installed go files need to go in a non-standard place:
>   /usr/lib/x86_64-linux-gnu/guile/2.2/site-ccache
> If I compile for the guix context then the expectation is that the files are 
> installed in
>  $prefix/lib/guile/2.2/site-ccache
>
> Here is my solution.  What do you think?  If $prefix is the same as used to 
> build guile
> then I use the directories from $guile.  Otherwise, I use the default.  This 
> now works on
> ubuntu and guix.
>
> From configure.ac:
>
> guile_build_prefix=`$GUILE -c "(display (assq-ref %guile-build-info 
> 'prefix))"`
>
> if test "$guile_build_prefix" == "$prefix"; then
>   echo "using paths for installed guile"
>   GUILE_SITE_DIR
>   GUILE_SITE_GO_DIR
>   GUILE_DATA_DIR
> else
>   echo "using default paths for guile"
>   GUILE_SITE=$prefix/share/guile/site/$GUILE_EFFECTIVE_VERSION
> GUILE_SITE_GO=$prefix/lib/guile/$GUILE_EFFECTIVE_VERSION/site-ccache
>   GUILE_DATA=$prefix/share
>   AC_SUBST([GUILE_SITE])
>   AC_SUBST([GUILE_SITE_GO])
>   AC_SUBST([GUILE_DATA])
> fi
>
> GUILE_SITE_DIR is defined in guile.m4, the others are in my own package m4.
>

I use guile.m4 from the FSF [1]. It gets invoked in configure.ac as 
follows [2].

   GUILE_PROGS
   GUILE_FLAGS
   GUILE_SITE_DIR
   GUILE_EXT_DIR
   GUILE_CACHE_DIR

See [3] for Automake file. Basically the useful variables from guile.m4 
are: GUILE_SITE, GUILE_EXT, GUILE_CACHE.

Regards
Jan

[1]: https://gitlab.com/wedesoft/aiscm/-/blob/master/m4/guile.m4
[2]: https://gitlab.com/wedesoft/aiscm/-/blob/master/configure.ac#L236
[3]: https://gitlab.com/wedesoft/aiscm/-/blob/master/aiscm/Makefile.am