llvm do not generate __emutls_v.xx symbol for TLS variable alias

[llvmbot]

Bugzilla Link	43701
Version	trunk
OS	Linux
Attachments	source and build command and a patch to fix this bug
Reporter	LLVM Bugzilla Contributor

Extended Description

0. Program arguments: /usr/lib/llvm-7/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file /home/xxx/path/test.gcno -resource-dir /usr/lib/llvm-7/lib/clang/7.0.1 -D INCLUDE_SOURCE -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.1/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /home/xxx/path -ferror-limit 19 -fmessage-length 321 -femulated-tls -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o test.o -x c test.c -faddrsig
1. parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'test.c'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function '@getnewname'
   #​0 0x00007f9e1fc3fc2f llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0x9cec2f)
   #​1 0x00007f9e1fc3e160 llvm::sys::RunSignalHandlers() (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0x9cd160)
   #​2 0x00007f9e1fc3ff42 (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0x9cef42)
   #​3 0x00007f9e22c98730 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12730)
   #​4 0x00007f9e2016dfe4 llvm::SelectionDAG::getGlobalAddress(llvm::GlobalValue const*, llvm::SDLoc const&, llvm::EVT, long, bool, unsigned char) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xefcfe4)
   #​5 0x00007f9e201d079a llvm::TargetLowering::LowerToTLSEmulatedModel(llvm::GlobalAddressSDNode const*, llvm::SelectionDAG&) const (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xf5f79a)
   #​6 0x00007f9e21512524 llvm::X86TargetLowering::LowerGlobalTLSAddress(llvm::SDValue, llvm::SelectionDAG&) const (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0x22a1524)
   #​7 0x00007f9e2152e5e7 llvm::X86TargetLowering::LowerOperation(llvm::SDValue, llvm::SelectionDAG&) const (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0x22bd5e7)
   #​8 0x00007f9e20092bb4 (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xe21bb4)
   #​9 0x00007f9e200921d0 llvm::SelectionDAG::Legalize() (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xe211d0)
   #​10 0x00007f9e201a0816 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xf2f816)
   #​11 0x00007f9e2019f62e llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xf2e62e)
   #​12 0x00007f9e2019c966 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xf2b966)
   #​13 0x00007f9e214e43c1 (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0x22733c1)
   #​14 0x00007f9e1fe9fdf9 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xc2edf9)
   #​15 0x00007f9e1fd30668 llvm::FPPassManager::runOnFunction(llvm::Function&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xabf668)
   #​16 0x00007f9e1fd308c3 llvm::FPPassManager::runOnModule(llvm::Module&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xabf8c3)
   #​17 0x00007f9e1fd30c8b llvm::legacy::PassManagerImpl::run(llvm::Module&) (/lib/x86_64-linux-gnu/libLLVM-7.so.1+0xabfc8b)
   #​18 0x00000000006f21e5 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_deletellvm::raw_pwrite_stream >) (/usr/lib/llvm-7/bin/clang+0x6f21e5)
   #​19 0x0000000000c344a5 (/usr/lib/llvm-7/bin/clang+0xc344a5)
   #​20 0x00000000010b8415 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-7/bin/clang+0x10b8415)
   #​21 0x0000000000ad243f clang::FrontendAction::Execute() (/usr/lib/llvm-7/bin/clang+0xad243f)
   #​22 0x0000000000a93738 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-7/bin/clang+0xa93738)
   #​23 0x0000000000b608d6 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-7/bin/clang+0xb608d6)
   #​24 0x00000000006aa014 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-7/bin/clang+0x6aa014)
   #​25 0x00000000006a84b7 main (/usr/lib/llvm-7/bin/clang+0x6a84b7)
   #​26 0x00007f9e1edb309b __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409b)
   #​27 0x00000000006a5ada _start (/usr/lib/llvm-7/bin/clang+0x6a5ada)
   clang: error: unable to execute command: Segmentation fault
   clang: error: clang frontend command failed due to signal (use -v to see invocation)
   clang version 7.0.1-8 (tags/RELEASE_701/final)
   Target: x86_64-pc-linux-gnu
   Thread model: posix
   InstalledDir: /usr/bin