Do not link plugins against libvlccore explicitly

We really want plugins to resolve their VLC symbols against the already
loaded LibVLC core, rather than with their own version of it.
Performance benefit should be neglectible, if any.
Still, this will "fix" the plugin crash with static LibVLC builds (or
generate a due link-time error). Anyway, this is one step toward
supporting any form of static linking again.

modules/common.am

@@ -18,11 +18,15 @@ AM_CFLAGS = `$(VLC_CONFIG) --cflags plugin $@`
 AM_CXXFLAGS = `$(VLC_CONFIG) --cxxflags plugin $@`
 AM_OBJCFLAGS = `$(VLC_CONFIG) --objcflags plugin $@`
 AM_LDFLAGS = -rpath '$(libvlcdir)' \
-	-avoid-version -module -no-undefined \
+	-avoid-version -module \
 	-export-symbol-regex ^vlc_entry \
 	-shrext $(LIBEXT) \
 	 `$(VLC_CONFIG) --ldflags plugin $@`
-AM_LIBADD = `$(VLC_CONFIG) -libs plugin $@` $(LTLIBVLCCORE)
+AM_LIBADD = `$(VLC_CONFIG) -libs plugin $@`
+if HAVE_WIN32
+# Windows does not support undefined symbols
+AM_LIBADD += $(LTLIBVLCCORE)
+endif
 
 include $(srcdir)/Modules.am
 

src/vlc-plugin.pc.in

@@ -13,4 +13,5 @@ Cflags: -I${includedir} -I${includedir}/vlc/plugins \
 	@DEFS_BIGENDIAN@ \
 	-D_REENTRANT \
 	-D_THREAD_SAFE
-Libs: -L${libdir} -lvlccore
+# Plugins should link against an _already_ loaded LibVLC.
+#Libs: -L${libdir} -lvlccore