On Jun 11, 5:14=A0pm, Reinder Verlinde <rein...@[EMAIL PROTECTED]
> wrote:
> In article
> <fe79dd66-0263-429a-b443-a7a28ef08...@[EMAIL PROTECTED]
>,
>
>
>
> =A0piscesboy <oraclmas...@[EMAIL PROTECTED]
> wrote:
> > On Jun 11, 1:51=A0pm, piscesboy <oraclmas...@[EMAIL PROTECTED]
> wrote:
> > > This is my first time compiling objective C and C files together for
> > > one program. All of my files are C files except the main file which
is=
> > > in objective C called main.m
>
> > > Here is the code for my boilerplate main implementation file file:
>
> > > #im****t <Cocoa/Cocoa.h>
> > > #include "defs.h"
> > > #include "data.h"
> > > #include "treenode.h"
> > > #include "fileinout.h"
>
> > > int main(int argc, const char* argv[]){
>
> > > =A0 =A0 =A0 =A0 return 0;
>
> > > }
>
> > > All the other .h files in my #includes are C files containing my
> > > functions.
>
> > > Here is the error I get when I compile:
>
> > > gcc -Wno-im****t -ansi -pedantic -Wall -O2 -c treenode.c
> > > gcc -Wno-im****t -ansi -pedantic -Wall -O2 -c main.m
>
> This is not the cause of your error, but -Wno-im****t very, very likely
> is not something that you will want to compile .m files with. At the
> least, that would get rid of the warning
>
> > > main.m:1:2: warning: #im****t is a GCC extension
>
> I also guess that you are not using Xcode. Reason is that, on my system
> (10.5.3), Xcode compiles a simple main.m as
>
> CompileC /[...]/main.o /[...]/main.m normal ppc objective-c
> com.apple.compilers.gcc.4_0
>
> which eventually calls gcc passing a few zillion flags, including
>
> =A0 =A0 -fpascal-strings
> =A0 =A0 -x objective-c
> =A0 =A0 -arch i386
>
> If you are not using Xcode, start doing that, if only to check what
> command lines it produces.
>
> > > In file included from /System/Library/Frameworks/AppKit.framework/
> > > Headers/AppKit.h:53,
> > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0from
/System/Library/Frameworks/Coc=
oa.framework/
> > > Headers/Cocoa.h:13,
> > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0from main.m:1:
> > > /System/Library/Frameworks/AppKit.framework/Headers/NSEvent.h:72:
> > > error: syntax error before 'unsigned'
> > > make: *** [main.o] Error 1
>
> > > This is a fairly cryptic error for me but it appears to be
associated
> > > with the file #im****t 'ed from the Cocoa framework. What is going on
> > > here?
>
> > > I am an absolute beginner in using Objective C and I just want to
> > > learn to get this to compile for now.
>
> I guess that you are not telling the compiler that it is compiling
> Objective-C code. Hence, it interprets Cocoa/Cocoa.h as a C header,
> which in turn leads to your error message because some line in that
> header is not legal C. Producing good error messages for C code, and
> even more so for C++ code, in incredibly hard, and often impossible. The
> actual reason for the error could be any earlier line.
>
> > New development: I tracked down and looked at the file NSEvent.h and
> > looked at line 72 and found this:
>
> > static inline unsigned int NSEventMaskFromType(NSEventType type)
> > { return (1 << type); }
>
> > gcc says there is a syntax error before "unsigned".
>
> See my remark about producing good error messages for C/C++.
>
> > This appears to be the offending line of code for when I include
> > anything else it compiles fine. My worry now is that NSEvent.h is
> > busted and as I am a newbie I don't want to touch the code. I just
> > want to get it to work.
>
> > I never touched NSEvent.h in my life. What is going on here?
>
> On my system (10.5.3, with XCode 3.0), that line reads:
>
> NS_INLINE NSUInteger NSEventMaskFromType(NSEventType type) { return (1
> << type); }
>
> I guess your "tracking down" included preprocessing the code. If so,
> this is nothing to worry about. If not, can you check the actual file?
>
> If this does not help, start compiling a main.m that only contains
> "im****t <Cocoa/Cocoa.h>". If that succeeds, the problem likely is with
> some of your own files or with the commands you issue to compile your
> code.
>
> Reinder
Thanks for the help.
I tried something different albeit much simpler. This might clear
things up. Here is the makefile I am using to compile this newer, much
simpler program of mine that mixes Objective-C and regular C code:
TARGET=3Dtest
DEBUG=3Ddebugtest
GCC=3Dgcc -ansi -pedantic -Wall -O2 -o
GCCOP=3Dgcc -ansi -pedantic -Wall -O2 -c
GCCMOP=3Dgcc -x objective-c -framework Foundation -c
OBJECTS=3Dmain.o Person.o treenode.o
SOURCE=3Dmain.m Person.m treenode.c
TRASH=3D*.o *.c~ *.h~ $(TARGET) $(DEBUG) Makefile~
$(TARGET): $(OBJECTS) $(SOURCE)
$(GCC) $(TARGET) $(OBJECTS)
main.o: main.m defs.h
$(GCCMOP) main.m
Person.o: Person.m Person.h
$(GCCMOP) Person.m
treenode.o: treenode.c treenode.h
$(GCCMOP) treenode.c
clean:
rm -f $(TRASH)
My target is called test and depends on the objective-C files main.m,
and Person.m and the regular C file treenode.c
This is the error produced when I type 'make':
gcc -x objective-c -framework Foundation -c main.m
powerpc-apple-darwin8-gcc-4.0.1: -framework: linker input file unused
because linking not done
powerpc-apple-darwin8-gcc-4.0.1: Foundation: linker input file unused
because linking not done
gcc -x objective-c -framework Foundation -c Person.m
powerpc-apple-darwin8-gcc-4.0.1: -framework: linker input file unused
because linking not done
powerpc-apple-darwin8-gcc-4.0.1: Foundation: linker input file unused
because linking not done
gcc -x objective-c -framework Foundation -c treenode.c
powerpc-apple-darwin8-gcc-4.0.1: -framework: linker input file unused
because linking not done
powerpc-apple-darwin8-gcc-4.0.1: Foundation: linker input file unused
because linking not done
gcc -ansi -pedantic -Wall -O2 -o test main.o Person.o treenode.o
/usr/bin/ld: Undefined symbols:
=2Eobjc_class_name_NSConstantString
=2Eobjc_class_name_NSObject
=2Eobjc_class_name_NSString
__NSConstantStringClassReference
_objc_msgSend
_objc_msgSendSuper
collect2: ld returned 1 exit status
make: *** [test] Error 1
I think I know what is going on: that I am not linking the generated
object files properly. I do not know how to properly invoke the linker
to link the generated objective-c files mixed with C files.
Could you help with that?
Thanks.
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