Installing convenience libraries

[Akim Demaille]

[Please keep me in CC.]

Hi,

I'm trying to build a convenience library, install it, build another
convenience library on top of it (and again install it), and finally
link an executable using the latter library.

I thought I could do that using Libtool static libraries with
extension .la, but it seems I can't do that.  It works well with
.o/.a, but with .lo/.la, it fails without an explicit explanation:

 | + libtool --tag=CC --mode=compile gcc -static foo.c -c -o foo.lo
 | mkdir .libs
 |  gcc foo.c -c  -fPIC -DPIC -o .libs/foo.o
 |  gcc foo.c -c -o foo.o >/dev/null 2>&1
 | + libtool --tag=CC --mode=link gcc -static foo.lo -o libfoo.la
 | ar cru .libs/libfoo.a  foo.o
 | ranlib .libs/libfoo.a
 | creating libfoo.la
 | (cd .libs && rm -f libfoo.la && ln -s ../libfoo.la libfoo.la)
 | + libtool --tag=CC --mode=install install -c libfoo.la 
/tmp/test-libtool.sh.tmp/lib/libfoo.la
 | install -c .libs/libfoo.lai /tmp/test-libtool.sh.tmp/lib/libfoo.la
 | install: cannot stat `.libs/libfoo.lai': No such file or directory

Am I trying to do something silly?  This is

ltmain.sh (GNU libtool) 1.5.22 Debian 1.5.22-4 (1.1220.2.365 2005/12/18 
22:14:06)

If you want to try, use the attached script.  Without argument it uses
.o/.a, with -l it uses .lo/.la.  I'd like to stick to Libtool
libraries because eventually we will probably move to using dynamic
libraries (i.e., the first library libfoo would remain a convenience
library, which should be later integrated into libbar so that the
latter is really self-contained.  Not clear this is doable...).

Any help is appreciated!

#! /bin/sh

set -ex

case $1 in
  -l) ext=l;;
  '') ext=;;
   *) exit 1
esac

libtool='libtool --tag=CC'

tmp=/tmp/$(basename $0).tmp
rm -rf $tmp
mkdir $tmp
cd $tmp
mkdir lib

make_object ()
{
  base=$1
  cat >$base.c <<EOF
  int
  $base ()
  {
    return 42;
  }
EOF

  $libtool --mode=compile gcc -static $base.c -c -o $base.${ext}o
}

make_lib ()
{
  make_object $1
  $libtool --mode=link gcc -static $base.${ext}o -o lib$base.${ext}a
  $libtool --mode=install install -c lib$base.${ext}a $tmp/lib/lib$base.${ext}a
}

make_lib foo <<EOF
int
$base ()
{
  return 42;
}
EOF

make_lib bar <<EOF
extern int foo ();
int
$base ()
{
  return foo ();
}
EOF

make_object main <<EOF
extern int bar ();
int
main ()
{
  return bar ();
}
EOF

$libtool --mode=link gcc main.${ext}o -o main $tmp/lib/libbar.${ext}a

if ./main; then
  exit 1
else
  echo $?
fi