[LLVMbugs] [Bug 21329] New: fail to merge vtable uses across modules

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21329

            Bug ID: 21329
           Summary: fail to merge vtable uses across modules
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

See ASTReader.cpp:3000:

      // Later tables overwrite earlier ones.
      // FIXME: Modules will have some trouble with this. This is clearly not
      // the right way to do this.
      VTableUses.clear();

Thhis is fine for PCH but completely wrong for modules.

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