[LLVMbugs] [Bug 19441] New: Assertion failure: Unsupported aliasee

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19441

            Bug ID: 19441
           Summary: Assertion failure: Unsupported aliasee
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: magnus.reftel at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12379
  --> http://llvm.org/bugs/attachment.cgi?id=12379&action=edit
Reduced testcase

The following (possibly invalid) testcase makes "clang -c testcase.c" fail an
assertion:


int a[1];
int b __attribute__ ((alias ("a")));


The assertion failure is


clang: CodeGenModule.cpp:243: void
clang::CodeGen::CodeGenModule::checkAliases(): Assertion `(CE->getOpcode() ==
llvm::Instruction::BitCast || CE->getOpcode() ==
llvm::Instruction::AddrSpaceCast) && "Unsupported aliasee"' failed.
0  clang           0x0000000002612f52 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1  clang           0x0000000002612b74
2  libpthread.so.0 0x00007f4a715b2bb0
3  libc.so.6       0x00007f4a705c6f77 gsignal + 55
4  libc.so.6       0x00007f4a705ca5e8 abort + 328
5  libc.so.6       0x00007f4a705bfd43
6  libc.so.6       0x00007f4a705bfdf2
7  clang           0x0000000000a9e948
clang::CodeGen::CodeGenModule::checkAliases() + 504
8  clang           0x0000000000aa2509 clang::CodeGen::CodeGenModule::Release()
+ 25
9  clang           0x0000000000a36231
10 clang           0x0000000000bdb85b clang::ParseAST(clang::Sema&, bool, bool)
+ 507
11 clang           0x0000000000a36ede clang::CodeGenAction::ExecuteAction() +
78
12 clang           0x00000000008a67d6 clang::FrontendAction::Execute() + 150
13 clang           0x00000000008845e0
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 352
14 clang           0x000000000086bed2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1810
15 clang           0x0000000000865758 cc1_main(char const**, char const**, char
const*, void*) + 1288
16 clang           0x0000000000841544 main + 756
17 libc.so.6       0x00007f4a705b1de5 __libc_start_main + 245
18 clang           0x000000000086452d


The last version I've tested where this does not happen is r204895 and the
first version I've tested where it does happen is r204985.

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