[LLVMbugs] [Bug 19407] New: Potential vtordisp bug

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Apr 11 15:52:30 PDT 2014


http://llvm.org/bugs/show_bug.cgi?id=19407

            Bug ID: 19407
           Summary: Potential vtordisp bug
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

consider:
extern "C" int printf(const char *, ...);
struct A {};
struct B {};
struct C : A {
  virtual void fun() {}
};
struct D : virtual B, virtual C {
  virtual void fun() {}
  D() {}
};
int main() { printf("sizeof(D): %Iu\n", sizeof(D)); }

32-bit clang/MSVC

--- different.cpp_clang 2014-04-11 15:57:50.482628043 -0700
+++ different.cpp_vs    2014-04-11 15:57:50.462627835 -0700
@@ -1 +1 @@
-sizeof(D): 16
+sizeof(D): 12

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