Re: libobjc2 on windows

[Vincent Richomme]

>> 
>> Ok so finally I get loads of linker errors :
>> 
>> clang  -shared -Wl,--enable-auto-image-base
>> -Wl,--out-implib,./obj/libobjc.dll.a  -Wl,--enable-auto-import -g
>> -ltoydispatch      -o ./obj/objc-4.dll obj/class.c.o
obj/class_table.c.o
>> obj/encoding.c.o obj/hash_table.c.o obj/exception.c.o obj/gc.c.o
>> obj/hash.c.o obj/init.c.o obj/misc.c.o obj/nil_method.c.o
> obj/objects.c.o
>> obj/protocol.c.o obj/runtime.c.o obj/sarray.c.o obj/selector.c.o
>> obj/sendmsg.c.o obj/thr.c.o obj/libobjc_entry.c.o obj/NSBlocks.m.o
>> obj/NXConstStr.m.o obj/Object.m.o obj/Protocol.m.o
> obj/blocks_runtime.m.o
>> obj/linking.m.o obj/mutation.m.o obj/properties.m.o obj/sync.m.o   -L
>> toydispatch/obj   -L/home/Vincent/GNUstep/Library/Libraries
>> -L/GNUstep/Local/Library/Libraries -L/GNUstep/System/Library/Libraries 

>> -lpthread -lgnustep-gui -lgnustep-base -lws2_32 -ladvapi32 -lcomctl32
>> -luser32 -lcomdlg32 -lmpr -lnetapi32 -lm -I. 
>> Creating library file:
>> ./obj/libobjc.dll.aobj/class_table.c.o:fake:(.data+0x34): multiple
>> definition of `_objc_lookup_class'
>> obj/class.c.o:fake:(.data+0x0): first defined here
>> obj/class_table.c.o:fake:(.data+0x38): multiple definition of
>> `_objc_load_callback'
>> obj/class.c.o:fake:(.data+0xbc): first defined here
>> obj/class_table.c.o:fake:(.data+0x3c): multiple definition of
>> `_objc_object_alloc'
>> obj/class.c.o:fake:(.data+0xc0): first defined here
>> obj/class_table.c.o:fake:(.data+0x40): multiple definition of
>> `_objc_object_copy'
>> obj/class.c.o:fake:(.data+0xc4): first defined here
>> obj/class_table.c.o:fake:(.data+0x44): multiple definition of
>> `_objc_object_dispose'
>> obj/class.c.o:fake:(.data+0xc8): first defined here
>> obj/class_table.c.o:fake:(.data+0x48): multiple definition of
>> `_objc_malloc'
>> obj/class.c.o:fake:(.data+0xcc): first defined here
>> obj/class_table.c.o:fake:(.data+0x4c): multiple definition of
>> `_objc_atomic_malloc'
>> obj/class.c.o:fake:(.data+0xd0): first defined here
>> obj/class_table.c.o:fake:(.data+0x50): multiple definition of
>> `_objc_valloc'
>> obj/class.c.o:fake:(.data+0xd4): first defined here
>> obj/class_table.c.o:fake:(.data+0x54): multiple definition of
>> `_objc_realloc'
>> obj/class.c.o:fake:(.data+0xd8): first defined here
>> obj/class_table.c.o:fake:(.data+0x58): multiple definition of
>> `_objc_calloc'
>> obj/class.c.o:fake:(.data+0xdc): first defined here
>> obj/class_table.c.o:fake:(.data+0x5c): multiple definition of
> `_objc_free'
>> obj/class.c.o:fake:(.data+0xe0): first defined here
>> obj/class_table.c.o:fake:(.data+0x60): multiple definition of
>> `__objc_msg_forward'
>> obj/class.c.o:fake:(.data+0xe4): first defined here
>> obj/class_table.c.o:fake:(.data+0x64): multiple definition of
>> `__objc_msg_forward2'
>> obj/class.c.o:fake:(.data+0xe8): first defined here
>> ...
>> fu000001.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
>> fu000004.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
>> fu000006.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
>> fu000008.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
>> fu000010.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
>> fu000012.o:(.idata$2+0xc): more undefined references to
>> `libmsvcrt_a_iname' follow
>> nmth000000.o:(.idata$4+0x0): undefined reference to `_nm___iob
>> 
>> 
>> 
>> I have a question, when using clang does it use linker from binutils or
>> does it have 
>> its own linker ?
>> 
> 
> There are really some issues with dllexport/dllimport because when I
> comment them :
> 
> #  define objc_EXPORT  /*__declspec(dllexport)*/
> #  define objc_DECLARE /*__declspec(dllexport)*/
> 
> I only get the following errors :
> 
> Creating library file: ./obj/libobjc.dll.a
> obj/hash_table.c.o: In function `create_queue':
> C:\GNUstep\home\Vincent\libobjc2\hash_table.c:8: undefined reference to
> `toy_dispatch_queue_create'
> obj/hash_table.c.o: In function `objc_collect_garbage_data':
> C:\GNUstep\home\Vincent\libobjc2\hash_table.c:13: undefined reference to
> `toy_dispatch_async_f'
> obj/properties.m.o: In function `lock_spinlock':
> C:\GNUstep\home\Vincent\libobjc2\properties.m:56: undefined reference to
> `sleep'
> fu000001.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
> fu000004.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
> fu000006.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
> fu000008.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
> fu000010.o:(.idata$2+0xc): undefined reference to `libmsvcrt_a_iname'
> fu000012.o:(.idata$2+0xc): more undefined references to
> `libmsvcrt_a_iname' follow
> nmth000000.o:(.idata$4+0x0): undefined reference to `_nm___iob'
> collect2: ld returned 1 exit status
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> 
> 
> and now I think it's more a problem with mingw than with clang.


About mingw error I am investigating however as you can see above there
are
2 missing reference to toy_dispatch_async_f and toy_dispatch_queue_create.
The problem is you are adding -ltoydispatch to the command line but
generated dll
is named -ltoydispatch-1.dll so it should be -ltoydispatch-1.
I am not an export in binutils/libtool so I cannot tell you why a -1 is
added.