Re: [Mingw-users] linking objc program with gcc 4.5.0 fails

[Danny S. <dan...@cl...>]

From: "Ronald Pijnacker"

> $ gcc -o small small.m -lobjc
> Warning: .drectve `-aligncomm:___CTOR_LIST__,2 ' unrecognized
> Warning: .drectve `-aligncomm:___DTOR_LIST__,2' unrecognized
> C:\Temp\ccqIYWPK.o:small.m:(.text+0x18): undefined reference to 
> `objc_get_class'
> C:\Temp\ccqIYWPK.o:small.m:(.text+0x2b): undefined reference to 
> `objc_msg_lookup'
> C:\Temp\ccqIYWPK.o:small.m:(.text+0x55): undefined reference to 
> `objc_msg_lookup'
> C:\Temp\ccqIYWPK.o:small.m:(.text+0x83): undefined reference to 
> `__objc_exec_class'
> C:\Temp\ccqIYWPK.o:small.m:(.data+0x4c): undefined reference to 
> `__objc_class_name_Object'
> collect2: ld returned 1 exit status
>

This works for me:
gcc -static small.m -lobjc

There are upstream gcc  problems with the build of  libobjc-2.dll. Namely, 
the script to build the dll is bit-rotten (and has been so for a looooong 
time (~10 yrs)).  Building the dll without  the

#    ifdef DLL_EXPORT /* defined by libtool (if required) */
#  define objc_EXPORT  __declspec(dllexport)
#  define objc_DECLARE __declspec(dllexport)
#else
#  define objc_EXPORT  extern __declspec(dllimport)
#  define objc_DECLARE extern __declspec(dllimport)
#endif

business in src/libobjc/objc/objc-decls.h
and just relying on the default  --export-all   works for me, but I know 
hardly anything about  objc.

 I think the gnustep folk had something more elegant. (back in 1998/99)  but 
... golly, there have been a few brain cells gone AWOL since then.