objective-clinuxclanggnustep

unable to find objc.h during clang compile

I'm on Ubuntu 12.

I'm trying to compile an Objective-C hello_world app using clang. This is the source:

#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{
 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
 NSLog (@"hello world");
 [pool drain];
 return 0;
}

I use this commandline:

. /usr/share/GNUstep/Makefiles/GNUstep.sh
clang h.m `gnustep-config --objc-flags` -lgnustep-base -o hello

I get the following error:

clang: warning: argument unused during compilation: '--param ssp-buffer-size=4'
In file included from h.m:1:
In file included from /usr/include/GNUstep/Foundation/Foundation.h:30:
In file included from /usr/include/GNUstep/GNUstepBase/GSVersionMacros.h:193:
In file included from /usr/include/GNUstep/GNUstepBase/GSConfig.h:229:
/usr/include/GNUstep/GNUstepBase/preface.h:112:11: fatal error: 'objc/objc.h'
      file not found
 #include <objc/objc.h>
          ^
1 error generated.

The same commandline using gcc works fine.

Any ideas how to fix this missing objc.h error?

Solution

  • obj-c.h is part of the Objective-C runtime, have you got that installed? From my own experience GNUstep seems to be a world of hurt on most platforms, so it may simply be GNUstep's configure scripts refusing to pick it up even if it is installed, try their mailing list if you can't get a better answer here.