Add -Woverriding-method-mismatch:
% cc -Woverriding-method-mismatch -Wall -framework Foundation returnTypeTest.m
returnTypeTest.m:23:1: warning: conflicting return type in declaration of
'name': 'NSString *' vs 'NSSet *' [-Woverriding-method-mismatch]
- (NSSet*) name {
^ ~~~~~~
returnTypeTest.m:13:1: note: previous declaration is here
- (NSString*) name;
^ ~~~~~~~~~
1 warning generated.
> On 2015/10/20, at 18:21, Jens Alfke <j...@mooseyard.com> wrote:
>
> Watch out: the compiler in Xcode 7.1b3 is not detecting mismatched Obj-C
> return types, at least for methods that return objects. For example, the
> following compiles with no warnings, even with all typical warning flags
> enabled:
>
> @interface Foo : NSObject
> - (NSString*) name;
> @end
>
> @implementation Foo
> - (NSSet*) name { return nil; }
> @end
>
> Reported to Apple as rdar://23195007
>
> —Jens
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