[LLVMbugs] [Bug 17423] New: Crash on ignored attribute

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17423

            Bug ID: 17423
           Summary: Crash on ignored attribute
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: octoploid at yandex.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

markus at x4 clang_bugs % cat test2.ii

class c1 {
public:
  virtual void foo();
};
class c2 {
  virtual void method5();
};
class A : c1, c2 {
  __attribute__((__stdcall__)) void method5() {}
};
A c3_instance;

markus at x4 clang_bugs % clang++ -c -O2 test2.ii
test2.ii:10:18: warning: calling convention '__stdcall__' ignored for this
target [-Wignored-attributes]
  __attribute__((__stdcall__)) void method5() {}
                 ^
0  clang-3.4       0x0000000000fc47f2 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1  clang-3.4       0x0000000000fc43c4
2  libpthread.so.0 0x00007fd20f711820
3  clang-3.4       0x00000000010470d3
clang::CodeGen::CodeGenTypes::isFuncTypeArgumentConvertible(clang::QualType) +
19
4  clang-3.4       0x0000000001047247
clang::CodeGen::CodeGenTypes::isFuncTypeConvertible(clang::FunctionType const*)
+ 23
5  clang-3.4       0x000000000101fec6
clang::CodeGen::CodeGenVTables::MaybeEmitThunkAvailableExternally(clang::GlobalDecl,
clang::ThunkInfo const&) + 70
6  clang-3.4       0x0000000001020467
clang::CodeGen::CodeGenVTables::CreateVTableInitializer(clang::CXXRecordDecl
const*, clang::VTableComponent const*, unsigned int, std::pair<unsigned long,
clang::ThunkInfo> const*, unsigned int) + 967
7  clang-3.4       0x00000000010556f1
8  clang-3.4       0x000000000101f1fa
clang::CodeGen::CodeGenModule::EmitDeferredVTables() + 90
9  clang-3.4       0x000000000103b1e8
clang::CodeGen::CodeGenModule::EmitDeferred() + 40
10 clang-3.4       0x000000000103b279 clang::CodeGen::CodeGenModule::Release()
+ 9
11 clang-3.4       0x0000000000fe6330
12 clang-3.4       0x0000000001271f55 clang::ParseAST(clang::Sema&, bool, bool)
+ 805
13 clang-3.4       0x00000000011c0da9 clang::FrontendAction::Execute() + 169
14 clang-3.4       0x00000000011a30e8
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 296
15 clang-3.4       0x0000000000fc7d0a
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1402
16 clang-3.4       0x00000000006dcb88 cc1_main(char const**, char const**, char
const*, void*) + 824
17 clang-3.4       0x00000000006c77c9 main + 9193
18 libc.so.6       0x00007fd20f12ba75 __libc_start_main + 245
19 clang-3.4       0x00000000006dbdc2
Stack dump:
0.      Program arguments: /usr/local/bin/clang-3.4 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -disable-llvm-verifier
-main-file-name test2.ii -mrelocation-model static -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-momit-leaf-frame-pointer -coverage-file /var/tmp/clang_bugs/test2.o
-resource-dir /usr/local/bin/../lib/clang/3.4 -O2 -fdeprecated-macro
-fdebug-compilation-dir /var/tmp/clang_bugs -ferror-limit 19 -fmessage-length
174 -mstackrealign -fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o test2.o -x c++-cpp-output test2.ii 
1.      <eof> parser at end of file
2.      Per-file LLVM IR generation
clang-3.4: error: unable to execute command: Segmentation fault
clang-3.4: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.4 (http://llvm.org/git/clang.git
f78bf4a0132a3ea366ba3baadd9d6af26c617d11) (http://llvm.org/git/llvm.git
835e284214c6e920924b5375590e77fd953cbefe)
Target: x86_64-unknown-linux-gnu
Thread model: posix

The crash isn't 100% reproducible. Sometimes you have to compile a few
times to trigger it.

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