[LLVMbugs] [Bug 12322] New: -Wselector incorrectly warns about unimplemented selectors

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12322

             Bug #: 12322
           Summary: -Wselector incorrectly warns about unimplemented
                    selectors
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: tjw at me.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8247
  --> http://llvm.org/bugs/attachment.cgi?id=8247
test case

The attached test warns that -localizedStandardCompare: isn't implemented.
First off, it doesn't say what object it expects to implement the selector, but
more importantly it shouldn't warn here (it can't know what the elements of the
array implement). It *could* warn if -localizedStandardCompare: was not defined
on any object, but Foundation.h is imported and NSString defines this method.

Note also that the C version of the method in the test case does *not* warn.
This itself may be a bug (C code not getting properly checked for warnings), or
maybe it is behaving correctly and the ObjC code is buggy. Either way, both
should behave the same in this case.

clang version 3.1 (trunk 152932) (llvm/trunk 152930)
Target: x86_64-apple-darwin11.3.0
Thread model: posix

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