Hi all,
I'm using the cygwin devel libtool for a helper library for
the kde-cygwin port.
With the libtool-devel-20020202-1 I had a problem with the
cxx configuration, which prohibits linking of shared
libraries.
The message was:
libtool: link: warning: undefined symbols not allowed in
i686-pc-cygwin shared libraries
I have fixed this with the following patch in the CXX tag
configuration area:
$ diff /usr/autotool/devel/share/aclocal/libtool.m4.orig
/usr/autotool/devel/sh
are/aclocal/libtool.m4 -ubBp
--- /usr/autotool/devel/share/aclocal/libtool.m4.orig Sat
Apr 6 15:43:16 2002
+++ /usr/autotool/devel/share/aclocal/libtool.m4 Sat
Apr 6 17:06:58 2002
@@ -2554,8 +2554,8 @@ case $host_os in
# _LT_AC_TAGVAR(hardcode_libdir_flag_spec, $1) is
actually meaningless,
# as there is no search path for DLLs.
_LT_AC_TAGVAR(hardcode_libdir_flag_spec,
$1)='-L$libdir'
- _LT_AC_TAGVAR(allow_undefined_flag, $1)=unsupported
- _LT_AC_TAGVAR(always_export_symbols, $1)=yes
+ _LT_AC_TAGVAR(allow_undefined_flag, $1)=no
+ _LT_AC_TAGVAR(always_export_symbols, $1)=no
if $LD --help 2>&1 | egrep 'auto-import' > /dev/null;
then
_LT_AC_TAGVAR(archive_cmds,
$1)='$CC -shared -nostdlib $predep_objects $libobjs $deplibs
$postdep_objects $compil
er_flags -o $output_objdir/$soname
${wl}--image-base=0x10000000 ${wl}--out-implib,$lib'
With the libtool-devel-20020316 release this patch doesn't
work. Instead the default configuration area is used and a
static library is created.
$ make
source='profiler.cpp' object='profiler.lo' libtool=yes \
depfile='.deps/profiler.Plo'
tmpdepfile='.deps/profiler.TPlo' \
depmode=gcc /bin/sh ./admin/depcomp \
/bin/sh ./libtool --mode=compile
g++ -DPACKAGE=\"profiler\" -DVERSION=\"1.3.1\" -DHAVE_DLFCN_
H=1 -DHAVE_WINDOWS_H=1 -I.
-I. -g -O2 -c -o profiler.lo `test -f profiler.cpp ||
echo './'`profiler.cpp
mkdir .libs
g++ -DPACKAGE=\"profiler\" -DVERSION=\"1.3.1\" -DHAVE_DLFCN_
H=1 -DHAVE_WINDOWS_H=1 -I. -I. -g -O2 -c profiler.cpp -Wp,-
MD,.deps/profiler.TPlo -DPIC -o .libs/profiler.o
/bin/sh ./libtool --mode=link g++ -g -O2 -o
libprofiler.la -rpath /usr/local/lib -version-info `echo
1.3.1 | gawk 'BE
GIN { FS="."; } { print $1 ":" $2; }'` profiler.lo
libtool: link: warning: undefined symbols not allowed in
i686-pc-cygwin shared libraries
ar cru .libs/libprofiler.a .libs/profiler.o
ranlib .libs/libprofiler.a
creating libprofiler.la
(cd .libs && rm -f libprofiler.la && ln -s ../libprofiler.la
libprofiler.la)
After setting the allow_undefined_flag="no" in the libtool
default configuration the dll is created with using nm to
generate a symbols list.
$ make
source='profiler.cpp' object='profiler.lo' libtool=yes \
depfile='.deps/profiler.Plo'
tmpdepfile='.deps/profiler.TPlo' \
depmode=gcc /bin/sh ./admin/depcomp \
/bin/sh ./libtool --mode=compile
g++ -DPACKAGE=\"profiler\" -DVERSION=\"1.3.1\" -DHAVE_DLFCN_
H=1 -DHAVE_WINDOWS_H=1 -I.
-I. -g -O2 -c -o profiler.lo `test -f profiler.cpp ||
echo './'`profiler.cpp
mkdir .libs
g++ -DPACKAGE=\"profiler\" -DVERSION=\"1.3.1\" -DHAVE_DLFCN_
H=1 -DHAVE_WINDOWS_H=1 -I. -I. -g -O2 -c profiler.cpp -Wp,-
MD,.deps/profiler.TPlo -DPIC -o .libs/profiler.o
/bin/sh ./libtool --mode=link g++ -g -O2 -o
libprofiler.la -rpath /usr/local/lib -version-info `echo
1.3.1 | gawk 'BE
GIN { FS="."; } { print $1 ":" $2; }'` profiler.lo
generating symbol list for `libprofiler.la'
/usr/local/bin/nm -B .libs/profiler.o | sed -n -e
*[ ]\([ABCDGISTW][ABCDGISTW]*\)[ ][ ]*\(_\)\([_A-
Za-
z][_A-Za-z0-9]*\)$/\1 \2\3 \3/p' | sed 's/.* //' | sort |
uniq > .libs/libprofiler.exp
gcc -shared .libs/profiler.o -o
.libs/cygprofiler-1.dll -Wl,-retain-symbols-file -Wl,.libs/l
ibprofiler.exp -Wl,--out-
implib,.libs/libprofiler.dll.a
Creating library file: .libs/libprofiler.dll.a
warning: exporting
/usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/libgcc.a rejected
(auto-export)
warning: exporting /usr/lib/libcygwin.a rejected
(auto-export)
warning: exporting /usr/lib/w32api/libkernel32.a rejected
(auto-export)
warning: exporting
/usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/libgcc.a rejected
(auto-export)
num_of_bfd=42 num_of_left_bfd=0 whole_size= 3268
whole_reduced_size= 3264
creating libprofiler.la
(cd .libs && rm -f libprofiler.la && ln -s ../libprofiler.la
libprofiler.la)
The nm using is removed by setting always_export_symbols=no
in the default configuration area.
$ make
source='profiler.cpp' object='profiler.lo' libtool=yes \
depfile='.deps/profiler.Plo'
tmpdepfile='.deps/profiler.TPlo' \
depmode=gcc /bin/sh ./admin/depcomp \
/bin/sh ./libtool --mode=compile
g++ -DPACKAGE=\"profiler\" -DVERSION=\"1.3.1\" -DHAVE_DLFCN_
H=1 -DHAVE_WINDOWS_H=1 -I.
-I. -g -O2 -c -o profiler.lo `test -f profiler.cpp ||
echo './'`profiler.cpp
mkdir .libs
g++ -DPACKAGE=\"profiler\" -DVERSION=\"1.3.1\" -DHAVE_DLFCN_
H=1 -DHAVE_WINDOWS_H=1 -I. -I. -g -O2 -c profiler.cpp -Wp,-
MD,.deps/profiler.TPlo -DPIC -o .libs/profiler.o
/bin/sh ./libtool --mode=link g++ -g -O2 -o
libprofiler.la -rpath /usr/local/lib -version-info `echo
1.3.1 | gawk 'BE
GIN { FS="."; } { print $1 ":" $2; }'` profiler.lo
gcc -shared .libs/profiler.o -o
.libs/cygprofiler-1.dll -Wl,--image-base=0x10000000 -Wl,--ou
t-implib,.libs/libprofile
r.dll.a
Creating library file: .libs/libprofiler.dll.a
warning: exporting
/usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/libgcc.a rejected
(auto-export)
warning: exporting /usr/lib/libcygwin.a rejected
(auto-export)
warning: exporting /usr/lib/w32api/libkernel32.a rejected
(auto-export)
warning: exporting
/usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/libgcc.a rejected
(auto-export)
num_of_bfd=42 num_of_left_bfd=0 whole_size= 3268
whole_reduced_size= 3264
creating libprofiler.la
(cd .libs && rm -f libprofiler.la && ln -s ../libprofiler.la
libprofiler.la)
Any ideas ?
Ralf Habacker
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