Re: configuring apps for guile

[Matt Wette <matt.wette@gmail.com>]

On 2/16/20 6:48 AM, Ludovic Courtès wrote:
> Hello Matt,
>
> Matt Wette <matt.wette@gmail.com> skribis:
>
>>  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
> I would recommend not even bothering with the first part of the ‘if’,
> and instead always default to install files under $prefix (more
> precisely: under $datadir and $libdir).
>
> The bits I’ve been using are:
>
> configure.ac:
>
>    dnl We require guile.m4, from Guile.  Make sure it's available.
>    m4_pattern_forbid([^GUILE_P])
>    m4_pattern_allow([^GUILE_PKG_ERRORS])
>
>    GUILE_PKG([3.0 2.2 2.0])
>    GUILE_PROGS
>
> Makefile.am:
>
>    moddir = $(datadir)/guile/site/$(GUILE_EFFECTIVE_VERSION)
>    godir  = $(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/site-ccache
>
>    SOURCES = a.scm b.scm c.scm
>    GOBJECTS = $(SOURCES:%.scm=%.go)
>    nobase_mod_DATA = $(SOURCES)
>    nobase_go_DATA = $(GOBJECTS)
>
> I believe Hall¹ does the right thing, making it easier to get started
> with all this!
>
> Thanks,
> Ludo’.
>
> ¹ https://gitlab.com/a-sassmannshausen/guile-hall
>

What if you have a system that gives this (e.g., Ubuntu 18.04):

mwette$ /usr/bin/guile -c "(display (assq-ref %guile-build-info 
'prefix)) (newline)"
/usr

mwette$ /usr/bin/guile -c "(display (%site-ccache-dir)) (newline)"
/usr/lib/x86_64-linux-gnu/guile/2.2/site-ccache

I'm not sure that guile will find .go files installed in 
/usr/lib/guile/2.2/site-ccache.