Compiler crash on Xcode 8.3

[ukreator]

Crashes on any use of boost::sml in optimisation modes -O1 or -O0 for arm64 architecture. I'm aware that it's the problem of clang developers (I reported a bug vs Xcode), but maybe someone has some ideas how to workaround this. Currently it makes iOS development harder.

How to reproduce:
use any sml example and build it on mac with following flags:

clang++ -std=c++14 test.cpp -o test -O0 -g -I. -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.3.sdk

[krzysztof-jusiak]

Thanks, @ukreator for reporting that. Would you be able to provide a link to the issue, please? I don't own a mac so if you could please provide a call stack I will try to figure it out. In the meantime, I'll add Xcode-8.3 on travis too.

[ukreator]

Apple's bug tracker is not open as far as I understand. I managed to reproduce with Android NDK r15-beta under Linux. Also happens only for arm64 builds:

dmitry@dmitry8:~$ ./android-ndk-r15-beta1/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -c example.cpp -std=c++14 -o example.o -target arm64-v8a
clang++: error: unable to execute command: Segmentation fault (core dumped)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
Android clang version 3.8.275480  (based on LLVM 3.8.275480)
Target: arm64-v8a
Thread model: posix
InstalledDir: /home/dmitry/./android-ndk-r15-beta1/toolchains/llvm/prebuilt/linux-x86_64/bin
clang++: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script.
clang++: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/example-72dc2f.cpp
clang++: note: diagnostic msg: /tmp/example-72dc2f.sh
clang++: note: diagnostic msg:

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

This time I haven't submitted the bug to LLVM yet

[ukreator]

stack trace (not likely to help, but anyway):

0   clang                         	0x000000010f1de1c0 getCopyFromParts(llvm::SelectionDAG&, llvm::SDLoc const&, llvm::SDValue const*, unsigned int, llvm::MVT, llvm::EVT, llvm::Value const*, llvm::Optional<llvm::ISD::NodeType>) + 96
1   clang                         	0x000000010f1ddd1f llvm::RegsForValue::getCopyFromRegs(llvm::SelectionDAG&, llvm::FunctionLoweringInfo&, llvm::SDLoc const&, llvm::SDValue&, llvm::SDValue*, llvm::Value const*) const + 1871
2   clang                         	0x000000010f0f5ece llvm::SelectionDAGBuilder::getValueImpl(llvm::Value const*) + 1518
3   clang                         	0x000000010f0f5316 llvm::SelectionDAGBuilder::getValue(llvm::Value const*) + 150
4   clang                         	0x000000010f1ece55 llvm::SelectionDAGBuilder::LowerCallTo(llvm::ImmutableCallSite, llvm::SDValue, bool, llvm::BasicBlock const*) + 373
5   clang                         	0x000000010f1e9f07 llvm::SelectionDAGBuilder::visitCall(llvm::CallInst const&) + 599
6   clang                         	0x000000010f0f394a llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) + 58
7   clang                         	0x000000010f07e1a0 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 8640
8   clang                         	0x000000010f075afb llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 987
9   clang                         	0x000000010f0753f0 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 112
10  clang                         	0x000000010f04004e llvm::FPPassManager::runOnFunction(llvm::Function&) + 574
11  clang                         	0x000000010f05ec73 llvm::FPPassManager::runOnModule(llvm::Module&) + 51
12  clang                         	0x000000010f044709 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 489
13  clang                         	0x000000010f01999d clang::EmitBackendOutput(clang::DiagnosticsEngine&, 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> >) + 5261
14  clang                         	0x000000010eff19b9 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) + 393
15  clang                         	0x000000010ed8d279 clang::ParseAST(clang::Sema&, bool, bool) + 265
16  clang                         	0x000000010ed8a845 clang::FrontendAction::Execute() + 37
17  clang                         	0x000000010ed4e844 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 292
18  clang                         	0x000000010ed4c913 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3107
19  clang                         	0x000000010ed1b196 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 3510
20  clang                         	0x000000010ed16c5b main + 9051
21  libdyld.dylib                 	0x00007fffc99a5235 start + 1

[ukreator]

reference to android NDK issue: android/ndk#386

[ukreator]

fixed in XCode 9 and clang 5 (neither of them released yet)