[llvm-bugs] [Bug 38392] New: Missing "export *" results in bogus error with forward-declared enum

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38392

            Bug ID: 38392
           Summary: Missing "export *" results in bogus error with
                    forward-declared enum
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jordan_rose at apple.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 20625
  --> https://bugs.llvm.org/attachment.cgi?id=20625&action=edit
Self-contained test case

I think we've decided modules without `export *` aren't that interesting, but
nonetheless they shouldn't produce bogus errors. Given this (valid) Objective-C
header:

  // <Base/Base.h>
  enum Foo : int bar;
  enum Foo : int {
    FooA,
    FooB
  };

If it's included in module Base, and module BaseUser imports Base but does not
re-export it, Clang produces an error on the first line.

  ./Base/Base.h:1:16: error: definition of 'Foo' must be imported from module
        'Base' before it is required
  enum Foo : int bar;
                 ^
  ./Base/Base.h:3:6: note: previous definition is here
  enum Foo : int {
       ^

I didn't check whether C++ modules have the same problem.

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