For example, the following program compiles cleanly on OSX Panther/gcc 3.3, but generates error messages on gcc 3.3.3 on Linux. I realize that this particular example could be fixed by changing the return type of both create methods to (id), but other examples are not as easy to fix. For example the method "protocol" gets defined in NSProtocolChecker as returning type (Protocol *), making it impossible to use a class method "protocol" in any other class.
#include <Foundation/Foundation.h>
@interface Foo : NSObject
+ (Foo *)create;
- (NSString *)description;
@end
@interface Baz : NSObject
+ (Baz *)create;
- (NSString *)description;
@end
@implementation Foo
+ (Foo *)create {
return [[[Foo alloc] init] autorelease];
}
- (NSString *)description {
return @"Foo";
}
@end
@implementation Baz
+ (Baz *)create {
return [[[Baz alloc] init] autorelease];
}
- (NSString *)description {
return @"Baz";
}
@end
int
main(void)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
Foo *foo = [Foo create];
Baz *baz = [Baz create];
NSLog(@"foo:[EMAIL PROTECTED]", foo);
NSLog(@"baz:[EMAIL PROTECTED]", baz);
[pool release];
return 0;
}
On Linux gcc 3.3.3, this example generates the following warnings:
Baz.m: In function `main':
Baz.m:35: warning: multiple declarations for method `create'
Baz.m:4: warning: using `+(Foo *)create'
Baz.m:23: warning: also found `+(Baz *)create'
Baz.m:9: warning: also found `+(Baz *)create'
Baz.m:36: warning: multiple declarations for method `create'
Baz.m:4: warning: using `+(Foo *)create'
Baz.m:23: warning: also found `+(Baz *)create'
Baz.m:9: warning: also found `+(Baz *)create'
Baz.m:36: warning: initialization from incompatible pointer type
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