[LLVMbugs] [Bug 24020] New: Assertion failure on packed derived class

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24020

            Bug ID: 24020
           Summary: Assertion failure on packed derived class
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sunil_srivastava at playstation.sony.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Following example gives Assertion failure
---------------------------------------
struct Base
{
    char one;
    short two;
};

struct BasePacked {
    char one;
    short two;
} __attribute__((packed));
struct DerivedPacked : public BasePacked { int three; };
int FuncForDerivedPacked(DerivedPacked d)
{
    return d.three;
}
---------------------------------------------------

clang version 3.7.0 (trunk 241287)
Target: x86_64-unknown-linux-gnu


$clang++  -cc1 -emit-obj  -triple x86_64-unknown-linux-gnu ul.cpp
clang-3.7: /llvm/tools/clang/lib/CodeGen/TargetInfo.cpp:1821: static
{anonymous}::X86_64ABIInfo::Class
{anonymous}::X86_64ABIInfo::merge({anonymous}::X86_64ABIInfo::Class,
{anonymous}::X86_64ABIInfo::Class): Assertion `(Accum != Memory && Accum !=
ComplexX87) && "Invalid accumulated classification during merge."' failed

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