[Bug objc/30479] New: Precompiled headers don't seem to work with GNU ObjC

[n dot pero at mi dot flashnet dot it]

Consider the following files, test.h and test.m:

test.h:
-------

/* Contributed by Nicola Pero - Tue Jan 16 04:09:06 GMT 2007 */
#include <objc/objc.h>
#include <objc/Object.h>

@interface TestClass : Object
+ (int) test;
@end

test.m:
-------

#include "test.h"

@implementation TestClass
+ (int) test
{
  return 0;
}
@end

int main (void)
{
  return [TestClass test];
}


My compiler is 4.1.1 20070105 (Red Hat 4.1.1-51).

If I compile the files in the standard way --

 gcc test.m -lobjc

it all works.

If I first precompile test.h

 gcc -x objective-c-header test.h

I get the test.h.gch file, which looks ok, but then compiling fails --

 gcc test.m -lobjc

test.m:4: warning: cannot find interface declaration for
&#65533;TestClass&#65533;
test.m:4: error: redefinition of &#65533;struct TestClass&#65533;
(compilation aborts)

(I also got a compiler internal error once)

Using the -H option to gcc you can indeed confirm that compilation fails iff
the
precompiled ObjC header is used.

It seems that ObjC class declarations in ObjC headers are not read correctly/at
all from precompiled headers (C stuff works fine instead!).  Very
disappointing. :-(

I hope I'm missing an option / something, else it's a bug that needs fixing :-(

Thanks


-- 
           Summary: Precompiled headers don't seem to work with GNU ObjC
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: objc
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: n dot pero at mi dot flashnet dot it


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30479