Objective-c – Error : redefinition of ‘struct StructName’ message when compiling in Objective-C on Linux

I’m trying to compile Objective-C code on Ubuntu 12 Linux.

main.m looks like this:

#import <Foundation/Foundation.h>
#import "CEFoo/CEFoo.h"

int main (int argc, const char * argv[])
 {
  NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
  NSLog (@"hello world");
  [pool drain];
  return 0;
 }

In CEFoo.h, I have this definition:

struct StructName{  // line 86
 BOOL first; 
 ...
 ...
};

@interface StructName :NSObject  // line 92
BOOL first;  line 93
...
...
@end  // 96

When I go to compile

gcc main.m  `gnustep-config --objc-flags` -lgnustep-base -o main.bin

I received this message:

Foo/CEFoo.h:93:1: error: redefinition of ‘struct StructName’
Foo/CEFoo.h:86:8: note: originally defined here

I read that this could be caused by redefining the structure twice, or recursive importing when using include instead of import.

grep -r "struct StructName" *

The definition is displayed only once.

I also searched every include statement in the project and didn’t find obvious uses for include vs import, or CEFoo.h’s double include/imports (files containing structures being defined/imported more than once).

How can I further identify the cause of this? I’m assuming I imported twice – if I was, is there a way to observe it through the verbosity or logs defined the first time?

What can I do to fix this? Any other ideas?

TIA

Defining a class means creating a structure for it, and so on. And you happen to have a structure exactly like your class. For example, check the following code “live” at http://ideone.com/7kvFa

#import <objc/objc.h>

struct name {};

@interface name
@end

int
main() {
    return 0;
}