[LLVMbugs] [Bug 21587] New: Failed to recognize init selector when using precompiled header

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21587

            Bug ID: 21587
           Summary: Failed to recognize init selector when using
                    precompiled header
           Product: clang
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: 191919 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13355
  --> http://llvm.org/bugs/attachment.cgi?id=13355&action=edit
The build environment

clang svn trunk (222117 as I am submitting this bug) failed gave the following
message

```
1.mm:7:23: error: 'init' is unavailable
        return [[self alloc] init];
                             ^
/System/Library/Frameworks/Foundation.framework/Headers/NSLocale.h:39:1: note:
'init' has been explicitly marked unavailable here
- (instancetype)init NS_UNAVAILABLE;     /* do not invoke; not a valid
initializer for this class */
^
1 error generated.
```

when compiling a trivial source code like this when using PCH.


```
@interface Bug : NSResponder
@end

@implementation Bug

+ (instancetype)bug {
    return [[self alloc] init];
}

@end
```

The code should be ok and is compilable by svn 21xxxx.

I have attached the source codes and Makefile, please change /opt/bin/clang as
need.

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