Bug: With --disable-static, when libtool falls back to producing a static archive due to undefined symbols, it produces an empty archive.

[Max Bowsher]

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With --disable-static, when libtool falls back to producing a static
archive due to undefined symbols, it produces an empty archive.

The problem is caused because there are no non_pic_objects. Libtool
dutifully scans all referenced .lo files collecting non_pic_object
definitions, but there are none. It then, without complaint, produces an
empty static archive. Then, when something attempts to link to this, the
link fails, due to undefined symbols.

My solution to this is to use the pic_objects if there are no
non_pic_objects. I'm not certain if that is safe in a
platform-independent context, but it works well for me on Cygwin.

Consider also, that it doesn't have to be safe everywhere - only on
platforms which don't support undefined symbols in shared libraries,
which might cause a fallback to occur.

Max.


- --- /usr/share/libtool/ltmain.sh.orig   2005-11-23 22:30:13.901273600
+0000
+++ local-ltmain.sh     2005-10-03 15:11:49.294073600 +0100
@@ -1271,6 +1271,9 @@
                  if test -z "$pic_object" || test "$pic_object" = none
; then
                    arg="$non_pic_object"
                  fi
+               else
+                 # Better to try to use the PIC object than nothing
+                 non_pic_objects="$non_pic_objects $pic_object"
                fi
              else
                # Only an error if not doing a dry-run.
@@ -1788,6 +1791,9 @@
            if test -z "$pic_object" || test "$pic_object" = none ; then
              arg="$non_pic_object"
            fi
+         else
+           # Better to try to use the PIC object than nothing
+           non_pic_objects="$non_pic_objects $pic_object"
          fi
        else
          # Only an error if not doing a dry-run.
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