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Date: Tue, 21 Jan 2003 09:14:05 +0100
From: Marcel Telka <marcel AT telka DOT sk>
To: cygwin AT cygwin DOT com
Subject: How to build dll using libtool-devel (bug?)
Message-ID: <20030121081405.GA26223@tortuga.etc.sk>
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Hi.

Problem summary:
I'm unable to build shared library (dll) using current libtool-devel.

Here is a fragment from my build log:

/bin/bash ../libtool --mode=link gcc  -g -O2 -Wall   -o libioperm.la -rpath /usr/lib  ioperm.lo
libtool: link: warning: undefined symbols not allowed in i686-pc-cygwin shared libraries
ar cru .libs/libioperm.a  ioperm.o
ranlib .libs/libioperm.a
creating libioperm.la
(cd .libs && rm -f libioperm.la && ln -s ../libioperm.la libioperm.la)


Problem is probably in my configure script:

cygwin* | mingw* | pw32*)
      # _LT_AC_TAGVAR(hardcode_libdir_flag_spec, ) is actually meaningless,
      # as there is no search path for DLLs.
      hardcode_libdir_flag_spec='-L$libdir'
      allow_undefined_flag=unsupported
      always_export_symbols=no
      enable_shared_with_static_runtimes=yes

If I remove the line with "allow_undefined_flag=unsupported" from the configure
script, dll build works (here is the log):

/bin/bash ../libtool --mode=link gcc  -g -O2 -Wall   -o libioperm.la -rpath /usr/lib  ioperm.lo
gcc -shared  .libs/ioperm.o   -o .libs/cygioperm-0.dll -Wl,--image-base=0x10000000 -Wl,--out-implib,.libs/libioperm.dll.a
Creating library file: .libs/libioperm.dll.a
ar cru .libs/libioperm.a  ioperm.o
ranlib .libs/libioperm.a
creating libioperm.la
(cd .libs && rm -f libioperm.la && ln -s ../libioperm.la libioperm.la)


Historical info:
Same configuration (same Makefile.am, same sources) built on September 2002
worked ok.
... and configure script was without "allow_undefined_flag=..." line for cygwin.

Questions:
1. How to build dlls using current libtool-devel?
2. Is this a bug in my configuration?
3. Is this a bug in libtool-devel?

Here is my Makefile.am file:
lib_LTLIBRARIES = libioperm.la
libioperm_la_SOURCES = ioperm.c


Thank you.

-- 
+-------------------------------------------+
| Marcel Telka   e-mail:   marcel AT telka DOT sk  |
|                homepage: http://telka.sk/ |
|                jabber:   marcel AT jabber DOT sk |
+-------------------------------------------+

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