faild build musl aarch64 target with -frounding-math

[SquallATF]

clang -std=c99 -nostdinc -ffreestanding -frounding-math -Wa,--noexecstack -D_XOPEN_SOURCE=700 -I./arch/aarch64 -I./arch/generic -Iobj/src/internal -I./src/include -I./src/internal -Iobj/include -I./include  -Os -pipe -fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -Qunused-arguments  -fPIC -c -o obj/src/complex/casinf.lo src/complex/casinf.c
fatal error: error in backend: Cannot select: 0x1fbd190: f32 = truncate 0x1fba1b0
  0x1fba1b0: f64,ch = strict_fsub nofpexcept 0x1f276f8, ConstantFP:f64<1.000000e+00>, 0x1fba0e0
    0x1fba148: f64 = ConstantFP<1.000000e+00>
    0x1fba0e0: f64,ch = strict_fp_extend nofpexcept 0x1f276f8, 0x1fba078
      0x1fba078: f32,ch = strict_fmul nofpexcept 0x1f276f8, 0x1fb9fa8, 0x1fba010
        0x1fb9fa8: f32,ch = strict_fsub nofpexcept 0x1f276f8, 0x1fb9e08, 0x1fb9ed8
          0x1fb9e08: f32,ch = CopyFromReg 0x1f276f8, Register:f32 %0
            0x1fb9da0: f32 = Register %0
          0x1fb9ed8: f32,ch = CopyFromReg 0x1f276f8, Register:f32 %1
            0x1fb9e70: f32 = Register %1
        0x1fba010: f32,ch = strict_fadd nofpexcept 0x1f276f8, 0x1fb9e08, 0x1fb9ed8
          0x1fb9e08: f32,ch = CopyFromReg 0x1f276f8, Register:f32 %0
            0x1fb9da0: f32 = Register %0
          0x1fb9ed8: f32,ch = CopyFromReg 0x1f276f8, Register:f32 %1
            0x1fb9e70: f32 = Register %1
In function: casinf
Stack dump:
0.      Program arguments: clang -std=c99 -nostdinc -ffreestanding -frounding-math -Wa,--noexecstack -D_XOPEN_SOURCE=700 -I./arch/aarch64 -I./arch/generic -Iobj/src/internal -I./src/include -I./src/internal -Iobj/include -I./include -Os -pipe -fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -Qunused-arguments -fPIC -c -o obj/src/complex/casinf.lo src/complex/casinf.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'src/complex/casinf.c'.
4.      Running pass 'AArch64 Instruction Selection' on function '@casinf'
 #0 0x00007fad433ce8fd PrintStackTraceSignalHandler(void*) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xc368fd)
 #1 0x00007fad433cc6ae llvm::sys::RunSignalHandlers() (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xc346ae)
 #2 0x00007fad433cdbbd llvm::sys::CleanupOnSignal(unsigned long) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xc35bbd)
 #3 0x00007fad4331d9ea (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xb859ea)
 #4 0x00007fad4331d98b (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xb8598b)
 #5 0x00007fad433c998e (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xc3198e)
 #6 0x0000000000210ff1 (/opt/cross/aarch64-unknown-linux-gnu/bin/clang-10+0x210ff1)
 #7 0x00007fad433285c7 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xb905c7)
 #8 0x00007fad433286a0 llvm::report_fatal_error(llvm::StringRef, bool) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xb906a0)
 #9 0x00007fad43a3df49 (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x12a5f49)
#10 0x00007fad43a3d645 (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x12a5645)
#11 0x00007fad4481372f (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x207b72f)
#12 0x00007fad43a35fbc llvm::SelectionDAGISel::DoInstructionSelection() (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x129dfbc)
#13 0x00007fad43a3565c llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x129d65c)
#14 0x00007fad43a34d3a llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x129cd3a)
#15 0x00007fad43a32656 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0x129a656)
#16 0x00007fad436a31ae llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xf0b1ae)
#17 0x00007fad434e1d36 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xd49d36)
#18 0x00007fad434e1fb3 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xd49fb3)
#19 0x00007fad434e2471 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xd4a471)
#20 0x00007fad4172bb84 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream> >) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1794b84)
#21 0x00007fad419c074c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1a2974c)
#22 0x00007fad40b29c63 clang::ParseAST(clang::Sema&, bool, bool) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0xb92c63)
#23 0x00007fad41e8d487 clang::FrontendAction::Execute() (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1ef6487)
#24 0x00007fad41e29881 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1e92881)
#25 0x00007fad41ef3e47 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1f5ce47)
#26 0x0000000000210bee cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/cross/aarch64-unknown-linux-gnu/bin/clang-10+0x210bee)
#27 0x000000000020edc1 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) (/opt/cross/aarch64-unknown-linux-gnu/bin/clang-10+0x20edc1)
#28 0x00007fad41b66122 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const::$_1>(long) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1bcf122)
#29 0x00007fad4331d967 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libLLVM-10git.so+0xb85967)
#30 0x00007fad41b65750 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1bce750)
#31 0x00007fad41b34d81 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1b9dd81)
#32 0x00007fad41b352ba clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1b9e2ba)
#33 0x00007fad41b4d99b clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) (/opt/cross/aarch64-unknown-linux-gnu/bin/../lib/libclang-cpp.so.10git+0x1bb699b)
#34 0x000000000020e710 main (/opt/cross/aarch64-unknown-linux-gnu/bin/clang-10+0x20e710)
#35 0x00007fad3f829b97 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b97)
#36 0x000000000020bfaa _start (/opt/cross/aarch64-unknown-linux-gnu/bin/clang-10+0x20bfaa)
clang-10: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 10.0.0 (https://github.com/llvm/llvm-project.git da883d2c3b2fcf4977f2bbac11012da804655919)
Target: aarch64-openwrt-linux-musl
Thread model: posix
InstalledDir: /opt/cross/aarch64-unknown-linux-gnu/bin
clang-10: note: diagnostic msg: PLEASE submit a bug report to https://bugs.llvm.org/ 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/casinf-f7b816.c
clang-10: note: diagnostic msg: /tmp/casinf-f7b816.sh
clang-10: note: diagnostic msg:

********************

casinf-f7b816.zip

[zmodem]

This seems to fail on the 10.x branch, but not master (I used 377b0e2).

I'll try to bisect to see what made it stop crashing on master..

[zmodem]

Seems it was fixed by 258d8dd. I'll follow up on the code review for that: https://reviews.llvm.org/D73201

[SquallATF]

I have cherry-pick 258d8dd , but still build crash at another file.

clang -std=c99 -nostdinc -ffreestanding -frounding-math -Wa,--noexecstack -D_XOPEN_SOURCE=700 -I./arch/aarch64 -I./arch/generic -Iobj/src/internal -I./src/include -I./src/internal -Iobj/include -I./include  -Os -pipe -fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -Qunused-arguments  -fPIC -c -o obj/src/complex/catan.lo src/complex/catan.c
clang: /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:2420: llvm::SDValue (anonymous namespace)::SelectionDAGLegalize::ExpandLegalINT_TO_FP(llvm::SDNode *, llvm::SDValue &): Assertion `!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet"' failed.
Stack dump:
0.      Program arguments: clang -std=c99 -nostdinc -ffreestanding -frounding-math -Wa,--noexecstack -D_XOPEN_SOURCE=700 -I./arch/aarch64 -I./arch/generic -Iobj/src/internal -I./src/include -I./src/internal -Iobj/include -I./include -Os -pipe -fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Werror=implicit-function-declaration -Werror=implicit-int -Werror=pointer-sign -Werror=pointer-arith -Qunused-arguments -fPIC -c -o obj/src/complex/catan.lo src/complex/catan.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'src/complex/catan.c'.
4.      Running pass 'AArch64 Instruction Selection' on function '@catan'
 #0 0x00007f2276cc5ce7 llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/squallatf/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:11
 #1 0x00007f2276cc5dd9 PrintStackTraceSignalHandler(void*) /home/squallatf/llvm-project/llvm/lib/Support/Unix/Signals.inc:625:1
 #2 0x00007f2276cc472b llvm::sys::RunSignalHandlers() /home/squallatf/llvm-project/llvm/lib/Support/Signals.cpp:67:5     #3 0x00007f2276cc560e llvm::sys::CleanupOnSignal(unsigned long) /home/squallatf/llvm-project/llvm/lib/Support/Unix/Signals.inc:362:1
 #4 0x00007f2276b38ec8 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) /home/squallatf/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:77:20
 #5 0x00007f2276b3914e CrashRecoverySignalHandler(int) /home/squallatf/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:383:1
 #6 0x00007f22741a3890 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #7 0x00007f226de86e97 raise /build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #8 0x00007f226de88801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #9 0x00007f226de7839a __assert_fail_base /build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#10 0x00007f226de78412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#11 0x00007f227783f2f8 (anonymous namespace)::SelectionDAGLegalize::ExpandLegalINT_TO_FP(llvm::SDNode*, llvm::SDValue&) /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:2425:11
#12 0x00007f2277821c7e (anonymous namespace)::SelectionDAGLegalize::ExpandNode(llvm::SDNode*) /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:2970:12
#13 0x00007f227781ee6b (anonymous namespace)::SelectionDAGLegalize::LegalizeOp(llvm::SDNode*) /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1253:11
#14 0x00007f227781d6db llvm::SelectionDAG::Legalize() /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:4800:13
#15 0x00007f2277a03834 llvm::SelectionDAGISel::CodeGenAndEmitDAG() /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:926:3
#16 0x00007f2277a0263f llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, bool&) /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:737:1
#17 0x00007f2277a020a4 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:0:7
#18 0x00007f22779ff2e1 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/squallatf/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:503:3
#19 0x00007f22797a2488 (anonymous namespace)::AArch64DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/squallatf/llvm-project/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp:54:5
#20 0x00007f2277373b57 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /home/squallatf/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:73:8
#21 0x00007f2276f3347c llvm::FPPassManager::runOnFunction(llvm::Function&) /home/squallatf/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1481:23
#22 0x00007f2276f338a5 llvm::FPPassManager::runOnModule(llvm::Module&) /home/squallatf/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1517:16
#23 0x00007f2276f34024 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /home/squallatf/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1582:23
#24 0x00007f2276f33b48 llvm::legacy::PassManagerImpl::run(llvm::Module&) /home/squallatf/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1694:16
#25 0x00007f2276f345c1 llvm::legacy::PassManager::run(llvm::Module&) /home/squallatf/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1725:3
#26 0x00007f22722de13b (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream> >) /home/squallatf/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:913:3
#27 0x00007f22722da4ab clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream> >) /home/squallatf/llvm-project/clang/lib/CodeGen/BackendUtil.cpp:1550:5
#28 0x00007f22727b836c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) /home/squallatf/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:335:7
#29 0x00007f2270803f8e clang::ParseAST(clang::Sema&, bool, bool) /home/squallatf/llvm-project/clang/lib/Parse/ParseAST.cpp:178:12
#30 0x00007f227306a382 clang::ASTFrontendAction::ExecuteAction() /home/squallatf/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1045:1
#31 0x00007f22727b3340 clang::CodeGenAction::ExecuteAction() /home/squallatf/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1177:1
#32 0x00007f2273069d58 clang::FrontendAction::Execute() /home/squallatf/llvm-project/clang/lib/Frontend/FrontendAction.cpp:940:7
#33 0x00007f2273008373 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /home/squallatf/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:965:23
#34 0x00007f2273146da0 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /home/squallatf/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:290:8
#35 0x0000000000235bc8 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /home/squallatf/llvm-project/clang/tools/driver/cc1_main.cpp:240:13
#36 0x00000000002289f2 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) /home/squallatf/llvm-project/clang/tools/driver/driver.cpp:328:5
#37 0x00007f2272befaa8 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const::$_1::operator()() const /home/squallatf/llvm-project/clang/lib/Driver/Job.cpp:417:34
#38 0x00007f2272befa75 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const::$_1>(long) /home/squallatf/llvm-project/llvm/include/llvm/ADT/STLExtras.h:108:5
#39 0x00007f2276b39429 llvm::function_ref<void ()>::operator()() const /home/squallatf/llvm-project/llvm/include/llvm/ADT/STLExtras.h:125:5
#40 0x00007f2276b38cb4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) /home/squallatf/llvm-project/llvm/lib/Support/CrashRecoveryContext.cpp:419:3
#41 0x00007f2272bef256 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const /home/squallatf/llvm-project/clang/lib/Driver/Job.cpp:417:7
#42 0x00007f2272b9ba22 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const /home/squallatf/llvm-project/clang/lib/Driver/Compilation.cpp:182:7
#43 0x00007f2272b9bc0b clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const /home/squallatf/llvm-project/clang/lib/Driver/Compilation.cpp:233:13
#44 0x00007f2272bb5fce clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) /home/squallatf/llvm-project/clang/lib/Driver/Driver.cpp:1480:7      #45 0x00000000002283cf main /home/squallatf/llvm-project/clang/tools/driver/driver.cpp:496:9
#46 0x00007f226de69b97 __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#47 0x00000000002273fa _start (/opt/cross/aarch64-unknown-linux-gnu/bin/clang-10+0x2273fa)
clang-10: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 10.0.0 (https://github.com/llvm/llvm-project.git 2a6fbb0c039857a394c1890c4957f34a1c5f700c)
Target: aarch64-openwrt-linux-musl
Thread model: posix
InstalledDir: /opt/cross/aarch64-unknown-linux-gnu/bin
clang-10: note: diagnostic msg: PLEASE submit a bug report to https://bugs.llvm.org/ 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/catan-3cdc6c.c
clang-10: note: diagnostic msg: /tmp/catan-3cdc6c.sh
clang-10: note: diagnostic msg:

********************
Segmentation fault

catan-3cdc6c.zip

[zmodem]

Thank you for sharing the repro.
That one was fixed by 0bb9a27
This is one of the commits listed by John here: https://reviews.llvm.org/D73201#1880487 and I will try to get them all onto the 10.x branch.

Can you share instructions for building musl with -frounding-math so that I can verify that this fixes all issues?

[SquallATF]

musl default configure will use -frounding-math default if compiler supported.

CC=clang ./configure --prefix=/usr --build=x86_64-unkown-linux-gnu --host=aarch64-unkown-linux-musl --target=aarch64-unkown-linux-musl

I have cherry-pick all commits listed in https://reviews.llvm.org/D73201#1880487 and I can build musl successful.

[zmodem]

Excellent, thank you! Let's close this then.