Building DLL
Maarten Boekhold
boekhold@emirates.net.ae
Mon Jul 12 15:54:00 GMT 2004
Hi all,
Sorry to keep going on about this, I really want to get this working.
I've made *some* progress in how to build "plugin libraries". I have
attached my test case to this mail in case somebody is willing to have a
look at it. Let me describe it first.
I did some reading on the libtool documentation, and according to that,
libtool 1.5.6 has specific support for dlopen'ed libraries (which is
what glib/gmodule uses under the hood if I'm not mistaken). The trick is
an extra macro to your configure.ac (AC_LIBTOOL_DLOPEN) and two
additional flags to libtool: -module and -export-dynamic. Now, I'm not
sure if that support is supposed to work on cygwin. But together with a
"plugin.def" file that defines to the library that a symbol is exported
by the executable, I can now get things to compile.
Caveat: I cannot get the 'plugin.def' file passed to the gcc command
line when linking:
/bin/bash ./libtool --mode=link gcc -g -O2 -o libplugin.la -rpath
/usr/local/lib -no-undefined -module plugin.def libplugin_la-plugin.lo
-lgobject-2.0 -lglib-2.0 -lintl -liconv
gcc -shared .libs/libplugin_la-plugin.o -L/usr/lib
/usr/lib/libgobject-2.0.dll.a /usr/lib/libglib-2.0.dll.a
/usr/lib/libintl.dll.a /usr/lib/libiconv.dll.a -o .libs/cygplugin-0.dll
-Wl,--image-base=0x10000000 -Wl,--out-implib,.libs/libplugin.dll.a
So instead I editted the generated 'libtool' (after running autogen.sh)
and added it manually:
# Commands used to build and install a shared archive.
archive_cmds="\$CC -shared \$libobjs \$deplibs \$compiler_flags -o
\$output_objdir/\$soname \${wl}--image-base=0x10000000
\${wl}--out-implib,\$lib plugin.def"
Note the "plugin.def" at the end. Now 'make' succeeds. If anybody knows
how I can pass the "plugin.def" to the GCC command line, I'd be very
interested to know.
Run 'make install', and then:
/usr/local/bin/plugintest /usr/local/lib/libplugin.la
This now gives:
$ /usr/local/bin/plugintest.exe /usr/local/lib/libplugin.la
** ERROR **: 1627507512s not a valid Win32 application.
aborting...
Aborted (core dumped)
Is this expected, and is there a way to fix this? Has anybody seen this
before? (note: for people not familiar with gmodule, the g_module_open()
function explicitly tests whether this is a libtool library, and if so
retrieves the actual DLL name from the libplugin.la file).
Kind regards,
Maarten
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