[LLVMbugs] [Bug 23068] New: Clang crash with 3.5 but not 3.4: Error: Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23068

            Bug ID: 23068
           Summary: Clang crash with 3.5 but not 3.4: Error:
                    Field->isUnnamedBitfield() && "Only unnamed bitfields
                    allowed"
           Product: clang
           Version: 3.5
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: asg.msft at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14119
  --> https://llvm.org/bugs/attachment.cgi?id=14119&action=edit
generated .ii file

Version Info (Both main trunk and from Android NDK r10d)
------------
clang version 3.5
Target: armv7-none-linux-androideabi

NOTE: This crash doesn't occur with Clang 3.4

Compilation Command:
%ClangROOT%\clang++.exe -target armv7-none-linux-androideabi -std=c++11 
-fms-extensions -gcc-toolchain
%NDKROOT%/Android/ndk/android-ndk-r10d/toolchains -c foo1.cpp -save-temps -v

Error on command prompt:
File: /s/ndk-toolchain/src/llvm-3.5/llvm/tools/clang/lib/CodeGen/CGExprAgg.cpp,
Line 1172

Expression: Field->isUnnamedBitfield() && "Only unnamed bitfields allowed"

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
clang++.exe: error: clang frontend command failed with exit code 3 (use -v to
se
e invocation)
clang version 3.5
Target: armv7-none-linux-androideabi
Thread model: posix
clang++.exe: note: diagnostic msg: PLEASE submit a bug report to
http://source.a
ndroid.com/source/report-bugs.html and include the crash backtrace,
preprocessed
 source, and associated run script.
clang++.exe: note: diagnostic msg:

Attached .ii file as well.

foo1:cpp 
-------
typedef struct _BAR
{
    unsigned char  c1;
} BAR;

typedef struct _FOO : BAR
{
    unsigned char  c2;
} FOO;

struct MyStruct
{
    FOO a;
    union {struct {int b;};};
};

void foo()
{
    MyStruct x = {};
}


Thanks.

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