[llvm-bugs] [Bug 32169] New: Clang also checks for invalid declarations in unused headers contained in used modules.

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https://bugs.llvm.org/show_bug.cgi?id=32169

            Bug ID: 32169
           Summary: Clang also checks for invalid declarations in unused
                    headers contained in used modules.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: teemperor at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 18061
  --> https://bugs.llvm.org/attachment.cgi?id=18061&action=edit
Failing clang testcase

When a module contains headers that are never directly used, they will still be
checked for incompatible declarations. This breaks working code when
transitioning to modules. See the attached clang test case for an example.

(Note: I'm not sure if this is an actual bug or if such behavior is undefined
when considering how modules work).

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