Hi,
I just ran into a small problem using libtool to build DLLs on mingw.
A library package had just been updated to libtool 2.2.6 and DLLs were
no longer being built - only the static library.
libtool reported that:
"undefined symbols not allowed in $host shared libraries"
however I knew the DLL had built previously and could find no undefined
symbols in the library.
I eventually tracked it in the libtool script to the following section
(sorry if the text wrapping gets broken on this):
func_mode_link ()
{
$opt_debug
case $host in
*-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2* | *-cegcc*)
# It is impossible to link a dll without this setting, and
# we shouldn't force the makefile maintainer to figure out
# which system we are compiling for in order to pass an extra
# flag for every libtool invocation.
# allow_undefined=no
# FIXME: Unfortunately, there are problems with the above when
trying # to make a dll which has undefined symbols, in which case not
# even a static library is built. For now, we need to specify
# -no-undefined on the libtool link line when we can be certain
# that all symbols are satisfied, otherwise we get a static
library.
allow_undefined=yes
;;
*)
allow_undefined=yes
;;
esac
It appears from the FIXME that on mingw libtool is enforcing static
library builds only, regardless of whether there are undefined symbols
or not. Is this correct?
I fixed the problem by adding an explicit "-no-undefined" to the
libtool link command - is this considered to be the correct fix or am I
missing something obvious?
I would have expected that if I tried to build a dll with undefined
symbols that the build would fail, rather than libtool only building
static libraries regardless.
I'd be grateful for any further information on this
Steve
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