Which version of GCC are you using ? I use 3.0.4.
How can you compile .c using g++ and .m using gcc
in the same GNUmakefile ?
If I use CC=gcc++ at the beginning,
it will complain that g++ unrecognize option '-MP'
and cc1obj invalide option '-fconstant-string-class=NSConstantString'
Here is what I have:
g++ main.m -c \
-MMD -MP -DGNUSTEP -DGNUSTEP_BASE_LIBRARY=1 ...
-o shared_objc/ix86/freebsd/gnu-gnu-gnu/main.o
...
So I use CC=gcc to get the .o file first.
Then use CC=g++ again, I got the error in previous message...
So weird... need to look into it....
Yen-Ju
>From: Pascal Bourguignon <[EMAIL PROTECTED]>
>Reply-To: <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>CC: [EMAIL PROTECTED]
>Subject: Re: Link to C++ library
>Date: Tue, 10 Sep 2002 23:28:28 +0200 (CEST)
>
> > From: "Yen-Ju Chen" <[EMAIL PROTECTED]>
> > Date: Tue, 10 Sep 2002 16:55:52 -0400
> >
> >
> > Thanx a lot. It helps.
> > But can I directly link Objective-C to C++ throught
> > the C interface which the C++ library offers ?
> >
> > After apply the CC=g++, the error message becomes
> >
> > .../libgnustep-base.so: undefined reference to '__objc_msg_forward'
> > .../libgnustep-base.so: undefined reference to '__objc_msg_thread_add'
> > .../libgnustep-base.so: undefined reference to
>'__objc_msg_thread_remove'
> >
> > Or do I need to write a C library as the bridge between Objective-C
>and
> > C++ ?
>
>You seem to be missing the Objective-C runtime. I still use a GNUstep
>some months old, but it's makefiles automatically cite -lobjc on the
>link line. I have something like:
>
> g++ -rdynamic \
> -o MyApp.app/ix86/linux-gnu/gnu-gnu-gnu/MyApp \
> shared_obj/ix86/linux-gnu/gnu-gnu-gnu/MyObjects.o ... \
> -L/home/pascal/GNUstep/Libraries/ix86/linux-gnu/gnu-gnu-gnu \
> -L/home/pascal/GNUstep/Libraries/ix86/linux-gnu \
> -L/local/gnustep/Local/Libraries/ix86/linux-gnu/gnu-gnu-gnu \
> -L/local/gnustep/Local/Libraries/ix86/linux-gnu \
> -L/local/gnustep/Network/Libraries/ix86/linux-gnu/gnu-gnu-gnu \
> -L/local/gnustep/Network/Libraries/ix86/linux-gnu \
> -L/local/gnustep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu \
> -L/local/gnustep/System/Libraries/ix86/linux-gnu \
> -L/local/gnustep/System/Libraries/ix86/linux-gnu \
> -lgnustep-gui -lgnustep-base -lobjc \
> -lz -lcallback -lavcall -lxml2 -lz -lm -lgmp -lpthread -ldl -lm \
> $(MyApp_OTHER_LIBRARIES)
>
>
> > Thanx again.
> >
> > Yen-Ju
> >
> > >From: Pascal Bourguignon <[EMAIL PROTECTED]>
> > >Date: Tue, 10 Sep 2002 22:38:13 +0200 (CEST)
> > > > From: "Yen-Ju Chen" <[EMAIL PROTECTED]>
> > > > Date: Tue, 10 Sep 2002 15:52:52 -0400
> > > >
> > > > I try to use the id3lib (http://www.id3lib.org), which is a
> > > > C++ library, but offer the C interface. But I met a problem
> > > > about linking between id3lib and standard C++ library. Is it
> > > > possible to use such C++ library with C interface in GNUstep ?
> > >
> > >I do link routinely C++ libraries into GNUstep / Objective-C
> > >applications without any problem, passing thru a C interface.
> > >
> > >Here is an example of GNUmakefile I used lately. The only notable
> > >thing is the use of the g++ compiler (CC=g++) to compile the
> > >MyCppLibCalls.c file, which contains only simple C functions each
> > >sending a message to a C++ object from libMyCppLib.a, which is a
> > >library of C++ objects.
>
>
>--
>__Pascal_Bourguignon__ http://www.informatimago.com/
>----------------------------------------------------------------------
> The name is Baud,...... James Baud.
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