U++

In a big project, using many dynamic libraries, I've got a linker problem of "undefined symbol" for symbols inside dynamic .so libraries.
I double checked, and symbols are there.
So I tried to replicate the issue by command line. IDE linker command is:
@
-o
"/home/massimo/sources/upp-svn/out/UppCad/GCC.Debug.Debug_Full.Gui.Mt.Noblitz.Nogtk.Shared/UppCad"
-ggdb
-L"/usr/X11R6/lib"
-L"/usr/local/lib/oce"
-Wl,-O,2

<object files>

-Wl,--start-group

<packages static libs>

<dynamic libs>

-Wl,--end-group
@

notice the --start-group and --end-group enclosing both static and shared libraries.
The manual command gave same error as theide one.
Moving the --end-group at end of static libs (GCC manual states that it's only used for static objects, not shared ones...):
@
-o
"/home/massimo/sources/upp-svn/out/UppCad/GCC.Debug.Debug_Full.Gui.Mt.Noblitz.Nogtk.Shared/UppCad"
-ggdb
-L"/usr/X11R6/lib"
-L"/usr/local/lib/oce"
-Wl,-O,2

<object files>

-Wl,--start-group

<packages static libs>

-Wl,--end-group

<dynamic libs>
@

The undefined symbols disappear.
I'm writing a patch for theide; Mirek please tell me if it's ok if I apply it.