Re: configuring apps for guile

["Ludovic Courtès" <ludo@gnu.org>]

Hi,

Matt Wette <matt.wette@gmail.com> skribis:

> On 2/16/20 9:57 AM, Ludovic Courtès wrote:
>> Hi,
>>
>> Matt Wette <matt.wette@gmail.com> skribis:
>>
>>> 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.
>> I guess you would run:
>>
>>    ./configure --prefix=/usr --libdir=/usr/lib/x86_64-linux-gnu
>>
>> in that case.
>>
>> Does that make sense?
>>
>> Ludo’.
> Yes, but some naive person (like me, for example) would never guess
> that is what is required.  (I ran into this installing bytestructures,
> IIRC).
> And the info is in pkgconfig/guile-2.2.pc, but still requires chasing down
> that resource.   Still thinking about it ...

Perhaps what ‘configure.ac’ could do is provide a hint when there’s a
mismatch.

In some packages I have:

  GUILE_SITE_DIR

  pkgdatadir="$datadir/$PACKAGE_NAME"
  if test "x$guilemoduledir" = "x"; then
    guilemoduledir="${datarootdir}/guile/site/$GUILE_EFFECTIVE_VERSION"
    guileobjectdir="${libdir}/guile/$GUILE_EFFECTIVE_VERSION/site-ccache"
  else
    guileobjectdir="$guilemoduledir"
  fi
  AC_SUBST([guilemoduledir])
  AC_SUBST([guileobjectdir])

  if test "$guilemoduledir" != "$GUILE_SITE"; then
     # Guile won't be able to locate the module "out of the box", so
     # warn the user.
     AC_MSG_WARN([`guilemoduledir' ($guilemoduledir) is different from `GUILE_SITE' ($GUILE_SITE).])
     AC_MSG_WARN([Make sure to adjust the `GUILE_LOAD_PATH' environment variable accordingly,])
     AC_MSG_WARN([or re-run `configure' with `--with-guilemoduledir=$GUILE_SITE'.])
  fi

The bottom line is that ‘configure’ can’t guess what the user wants.

Ludo’.