[llvm-bugs] [Bug 35815] New: [regression] erroneous "-Werror=nsconsumed-mismatch is currently enabled, but was not in the PCH file" when importing module

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35815

            Bug ID: 35815
           Summary: [regression] erroneous "-Werror=nsconsumed-mismatch is
                    currently enabled, but was not in the PCH file" when
                    importing module
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: arphaman at gmail.com
                CC: llvm-bugs at lists.llvm.org

The following sample illustrates the problem:

$ cat Inputs/module.map
module mod2 {
  header "mod2.h"
}

$ cat Inputs/mod2.h
@interface X2
@end

$ cat repr.m
@interface I

- (void)override;

@end

@implementation I

- (void)override { }

@end

@interface Sub

@end

@implementation Sub

- (void)override { }

@end

@import mod2;

$ clang -c -fmodules -I Inputs -fobjc-arc repr.m
repr.m:1:12: warning: class 'I' defined without specifying a base class
[-Wobjc-root-class]
@interface I
           ^
repr.m:1:13: note: add a super class to fix this problem
@interface I
            ^
repr.m:13:12: warning: class 'Sub' defined without specifying a base class
[-Wobjc-root-class]
@interface Sub
           ^
repr.m:13:15: note: add a super class to fix this problem
@interface Sub
              ^
error: -Werror=nsconsumed-mismatch is currently enabled, but was not in the PCH
file
2 warnings and 1 error generated.


The error should not be presented. This is a regression after r313717.

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