Created attachment 22596 [details] wrappers_c-d34ae5.cpp Original bug report: https://bugs.gentoo.org/695618 Reduced test case (courtesy of Sergei Trofimovich) attached. Tested with fresh LLVM+Clang trunk. To reproduce: $ clang -O1 -fno-plt -m32 wrappers_c-d34ae5.cpp Stack dump: 0. Program arguments: /usr/lib64/llvm/10/bin/clang-10 -cc1 -triple i386-pc-linux-gnu -emit-obj -disable-free -main-file-name wrappers_c-d34ae5.cpp -mrelocation-model static -mthread-model posix -mframe-pointer=none -fmath-errno -masm-verbose -mconstructor-aliases -fno-plt -fuse-init-array -target-cpu pentium4 -dwarf-column-info -debugger-tuning=gdb -resource-dir /usr/lib64/llvm/10/bin/../../../../lib/clang/10.0.0 -internal-isystem /usr/lib/gcc/x86_64-pc-linux-gnu/7.4.0/include/g++-v7 -internal-isystem /usr/lib/gcc/x86_64-pc-linux-gnu/7.4.0/include/g++-v7/x86_64-pc-linux-gnu/32 -internal-isystem /usr/lib/gcc/x86_64-pc-linux-gnu/7.4.0/include/g++-v7/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib64/llvm/10/bin/../../../../lib/clang/10.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O1 -fdeprecated-macro -fdebug-compilation-dir /var/tmp -ferror-limit 19 -fmessage-length 0 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -o wrappers_c-d34ae5.o -x c++ wrappers_c-d34ae5.cpp 1. <eof> parser at end of file 2. Code generation 3. Running pass 'Function Pass Manager' on module 'wrappers_c-d34ae5.cpp'. 4. Running pass 'Machine Common Subexpression Elimination' on function '@_Z1bv' #0 0x00007f173e9a6b01 llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/lib64/llvm/10/bin/../lib64/libLLVMSupport.so.10svn+0x1eeb01) #1 0x00007f173e9a6b70 (/usr/lib64/llvm/10/bin/../lib64/libLLVMSupport.so.10svn+0x1eeb70) #2 0x00007f173e9a3f75 llvm::sys::RunSignalHandlers() (/usr/lib64/llvm/10/bin/../lib64/libLLVMSupport.so.10svn+0x1ebf75) #3 0x00007f173e9a4155 (/usr/lib64/llvm/10/bin/../lib64/libLLVMSupport.so.10svn+0x1ec155) #4 0x00007f173b2a6d50 __restore_rt (/lib64/libc.so.6+0x36d50) #5 0x00007f17418618f4 (/usr/lib64/llvm/10/bin/../lib64/libLLVMCodeGen.so.10svn+0x2f18f4) #6 0x00007f1741868438 (/usr/lib64/llvm/10/bin/../lib64/libLLVMCodeGen.so.10svn+0x2f8438) #7 0x00007f174186a296 (/usr/lib64/llvm/10/bin/../lib64/libLLVMCodeGen.so.10svn+0x2fa296) #8 0x00007f174186a452 (/usr/lib64/llvm/10/bin/../lib64/libLLVMCodeGen.so.10svn+0x2fa452) #9 0x00007f174188fe26 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/usr/lib64/llvm/10/bin/../lib64/libLLVMCodeGen.so.10svn+0x31fe26) #10 0x00007f174105115a llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/lib64/llvm/10/bin/../lib64/libLLVMCore.so.10svn+0x25115a) #11 0x00007f17410513c6 llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/lib64/llvm/10/bin/../lib64/libLLVMCore.so.10svn+0x2513c6) #12 0x00007f17410517f6 (/usr/lib64/llvm/10/bin/../lib64/libLLVMCore.so.10svn+0x2517f6) #13 0x00007f1741051b7f llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/lib64/llvm/10/bin/../lib64/libLLVMCore.so.10svn+0x251b7f) #14 0x00007f1741051c11 llvm::legacy::PassManager::run(llvm::Module&) (/usr/lib64/llvm/10/bin/../lib64/libLLVMCore.so.10svn+0x251c11) #15 0x00007f173cda2489 (/usr/lib64/llvm/10/bin/../lib64/libclangCodeGen.so.10svn+0xf2489) #16 0x00007f173cda2f04 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_delete<llvm::raw_pwrite_stream> >) (/usr/lib64/llvm/10/bin/../lib64/libclangCodeGen.so.10svn+0xf2f04) #17 0x00007f173d0d335b (/usr/lib64/llvm/10/bin/../lib64/libclangCodeGen.so.10svn+0x42335b) #18 0x00007f1733555099 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib64/llvm/10/bin/../lib64/../lib64/libclangParse.so.10svn+0x35099) #19 0x00007f173c47a0f9 clang::ASTFrontendAction::ExecuteAction() (/usr/lib64/llvm/10/bin/../lib64/libclangFrontend.so.10svn+0x1120f9) #20 0x00007f173d0cc29f clang::CodeGenAction::ExecuteAction() (/usr/lib64/llvm/10/bin/../lib64/libclangCodeGen.so.10svn+0x41c29f) #21 0x00007f173c47ba6b clang::FrontendAction::Execute() (/usr/lib64/llvm/10/bin/../lib64/libclangFrontend.so.10svn+0x113a6b) #22 0x00007f173c431006 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib64/llvm/10/bin/../lib64/libclangFrontend.so.10svn+0xc9006) #23 0x00007f173c15e5f6 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib64/llvm/10/bin/../lib64/libclangFrontendTool.so.10svn+0x65f6) #24 0x0000557d60a9b6bb cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib64/llvm/10/bin/clang-10+0x166bb) #25 0x0000557d60a953a2 (/usr/lib64/llvm/10/bin/clang-10+0x103a2) #26 0x0000557d60a98cee main (/usr/lib64/llvm/10/bin/clang-10+0x13cee) #27 0x00007f173b291e77 __libc_start_main /var/tmp/portage/sys-libs/glibc-2.28-r5/work/glibc-2.28/csu/../csu/libc-start.c:342:0 #28 0x0000557d60a943da _start (/usr/lib64/llvm/10/bin/clang-10+0xf3da) clang-10: error: unable to execute command: Segmentation fault clang-10: error: clang frontend command failed due to signal (use -v to see invocation) clang version 10.0.0 (/var/tmp/portage/sys-devel/clang-10.0.0.9999/work/x/y/clang-10.0.0.9999 95e1920019249e0a20e850ca678d46df9c7b57e7) Target: i386-pc-linux-gnu Thread model: posix InstalledDir: /usr/lib/llvm/10/bin clang-10: note: diagnostic msg: PLEASE submit a bug report to and include the crash backtrace, preprocessed source, and associated run script. clang-10: note: diagnostic msg: ******************** PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang-10: note: diagnostic msg: /tmp/wrappers_c-d34ae5-018012.cpp clang-10: note: diagnostic msg: /tmp/wrappers_c-d34ae5-018012.sh clang-10: note: diagnostic msg: ********************