[Bug objc/41617] New: [4.4/4.5 regression] ObjC: Error: symbol `_OBJC_CLASS_AppController' is already defined

["doko at ubuntu dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Seen with a lot of GNUstep applications:

gcc AppController.m -c \
              -MMD -MP -DGNUSTEP -DGNUSTEP_BASE_LIBRARY=1 -DGNU_GUI_LIBRARY=1
-DGNU_RUNTIME=1 -DGNUSTEP_BASE_LIBRARY=1 -D_REENTRANT -fPIC -g -Wall -DDEBUG
-fno-omit-frame-pointer -DGSWARN -DGSDIAGNOSE -Wno-import -O2
-fno-strict-aliasing -fexceptions -fobjc-exceptions -D_NATIVE_OBJC_EXCEPTIONS
-fgnu-runtime -fconstant-string-class=NSConstantString -I.
-I/usr/local/include/GNUstep -I/usr/include/GNUstep \
               -o obj/AppController.m.o
In file included from Date.h:4,
                 from Event.h:3,
                 from AppointmentEditor.h:3,
                 from AppController.m:4:
/usr/include/ical.h:22:2: warning: #warning "#include <ical.h> is deprecated. 
Please #include <libical/ical.h> instead."
/tmp/ccdTn0Sv.s: Assembler messages:
/tmp/ccdTn0Sv.s:11021: Error: symbol `_OBJC_CLASS_AppController' is already
defined
make[2]: *** [obj/AppController.m.o] Error 1


-- 
           Summary: [4.4/4.5 regression] ObjC: Error: symbol
                    `_OBJC_CLASS_AppController' is already defined
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: objc
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: doko at ubuntu dot com
GCC target triplet: arm-linux-gnueabi


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41617