llvm crashes while building libobjc2

[Andreas Fink]

Hello all,
I'm rebuilding the latest version on libobj2 under debian8 and debian9 and I 
run into crashes of llvm. I have never seen this before with the same compiler. 
And its blocking the whole thing.

I've tried llvm-5.0 and llvm-6.0 and also the llvm-5.0 I compiled from source 
before which I used before to compile all just fine.

Anyhow having a clue on how to work around this?


It happens here:

Scanning dependencies of target ForwardDeclareProtocolAccess_legacy
[ 19%] Building C object 
Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/ForwardDeclareProtocolAccess.m.o
[ 19%] Building C object 
Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/ForwardDeclareProtocol.m.o
#0 0x0000564c7f0c57ca llvm::sys::PrintStackTrace(llvm::raw_ostream&) 
(/usr/local/bin/clang-5.0+0x1dc07ca)
#1 0x0000564c7f0c38ee llvm::sys::RunSignalHandlers() 
(/usr/local/bin/clang-5.0+0x1dbe8ee)
#2 0x0000564c7f0c3a12 SignalHandler(int) (/usr/local/bin/clang-5.0+0x1dbea12)
#3 0x00007f8ccb4fe0c0 __restore_rt 
(/lib/x86_64-linux-gnu/libpthread.so.0+0x110c0)
#4 0x0000564c7f427a50 llvm::IRBuilder<llvm::ConstantFolder, 
clang::CodeGen::CGBuilderInserter>::CreateCast(llvm::Instruction::CastOps, 
llvm::Value*, llvm::Type*, llvm::Twine const&) [clone .constprop.407] 
(/usr/local/bin/clang-5.0+0x2122a50)
#5 0x0000564c7f4283b7 (anonymous 
namespace)::CGObjCGNU::GenerateProtocolRef(clang::CodeGen::CodeGenFunction&, 
clang::ObjCProtocolDecl const*) (/usr/local/bin/clang-5.0+0x21233b7)
#6 0x0000564c7f413b9e (anonymous 
namespace)::ScalarExprEmitter::Visit(clang::Expr*) 
(/usr/local/bin/clang-5.0+0x210eb9e)
#7 0x0000564c7f414c30 
clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) 
(/usr/local/bin/clang-5.0+0x210fc30)
#8 0x0000564c7f297495 
clang::CodeGen::CodeGenFunction::EmitReturnStmt(clang::ReturnStmt const&) 
(/usr/local/bin/clang-5.0+0x1f92495)
#9 0x0000564c7f29946f 
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
 const&, bool, clang::CodeGen::AggValueSlot) 
(/usr/local/bin/clang-5.0+0x1f9446f)
#10 0x0000564c7f2c64d8 
clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::CodeGen::FunctionArgList&,
 clang::Stmt const*) (/usr/local/bin/clang-5.0+0x1fc14d8)
#11 0x0000564c7f2cda85 
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, 
llvm::Function*, clang::CodeGen::CGFunctionInfo const&) 
(/usr/local/bin/clang-5.0+0x1fc8a85)
#12 0x0000564c7f2e6e35 
clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, 
llvm::GlobalValue*) (/usr/local/bin/clang-5.0+0x1fe1e35)
#13 0x0000564c7f2f7299 
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, 
llvm::GlobalValue*) (/usr/local/bin/clang-5.0+0x1ff2299)
#14 0x0000564c7f2f8218 
clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) 
(/usr/local/bin/clang-5.0+0x1ff3218)
#15 0x0000564c7f2f8859 
clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) [clone 
.part.5457] (/usr/local/bin/clang-5.0+0x1ff3859)
#16 0x0000564c7f8df3c3 (anonymous 
namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) 
(/usr/local/bin/clang-5.0+0x25da3c3)
#17 0x0000564c7f8d60d2 
clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) 
(/usr/local/bin/clang-5.0+0x25d10d2)
#18 0x0000564c7fc5bfd6 clang::ParseAST(clang::Sema&, bool, bool) 
(/usr/local/bin/clang-5.0+0x2956fd6)
#19 0x0000564c7f8dd151 clang::CodeGenAction::ExecuteAction() 
(/usr/local/bin/clang-5.0+0x25d8151)
#20 0x0000564c7f5db016 clang::FrontendAction::Execute() 
(/usr/local/bin/clang-5.0+0x22d6016)
#21 0x0000564c7f5aa7f6 
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) 
(/usr/local/bin/clang-5.0+0x22a57f6)
#22 0x0000564c7f66c13b 
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) 
(/usr/local/bin/clang-5.0+0x236713b)
#23 0x0000564c7dcdf3b8 cc1_main(llvm::ArrayRef<char const*>, char const*, 
void*) (/usr/local/bin/clang-5.0+0x9da3b8)
#24 0x0000564c7dc64af3 main (/usr/local/bin/clang-5.0+0x95faf3)
#25 0x00007f8cca0812e1 __libc_start_main 
(/lib/x86_64-linux-gnu/libc.so.6+0x202e1)
#26 0x0000564c7dcdce2a _start (/usr/local/bin/clang-5.0+0x9d7e2a)
Stack dump:
0.      Program arguments: /usr/local/bin/clang-5.0 -cc1 -triple 
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free 
-disable-llvm-verifier -discard-value-names -main-file-name 
ForwardDeclareProtocol.m -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 
-debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb 
-coverage-notes-file 
/Users/afink/development/gnustep/libobjc2/Build/Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/ForwardDeclareProtocol.m.gcno
 -resource-dir /usr/local/lib/clang/5.0.0 -D GC_DEBUG -D GNUSTEP -D NO_LEGACY 
-D OLDABI_COMPAT=1 -D TYPE_DEPENDENT_DISPATCH -I 
/Users/afink/development/gnustep/libobjc2 -U NDEBUG -internal-isystem 
/usr/local/include -internal-isystem /usr/local/lib/clang/5.0.0/include 
-internal-externc-isystem /usr/include/x86_64-linux-gnu 
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O0 
-fdebug-compilation-dir /Users/afink/development/gnustep/libobjc2/Build/Test 
-ferror-limit 19 -fmessage-length 172 -fobjc-runtime=gnustep-1.7 
-fobjc-dispatch-method=non-legacy -fobjc-exceptions -fexceptions 
-fdiagnostics-show-option -fcolor-diagnostics -fexceptions -fobjc-exceptions 
-fblocks -o 
CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/ForwardDeclareProtocol.m.o 
-x objective-c 
/Users/afink/development/gnustep/libobjc2/Test/ForwardDeclareProtocol.m
1.      <eof> parser at end of file
2.      
/Users/afink/development/gnustep/libobjc2/Test/ForwardDeclareProtocol.m:4:11: 
LLVM IR generation of declaration 'getProtocol'
3.      
/Users/afink/development/gnustep/libobjc2/Test/ForwardDeclareProtocol.m:4:11: 
Generating code for declaration 'getProtocol'
clang-5.0: error: unable to execute command: Segmentation fault
clang-5.0: error: clang frontend command failed due to signal (use -v to see 
invocation)
clang version 5.0.0 (tags/RELEASE_500/final 320467)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-5.0: 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-5.0: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-5.0: note: diagnostic msg: /tmp/ForwardDeclareProtocol-e5f47b.m
clang-5.0: note: diagnostic msg: /tmp/ForwardDeclareProtocol-e5f47b.sh
clang-5.0: note: diagnostic msg:

********************
Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/build.make:86: recipe 
for target 
'Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/ForwardDeclareProtocol.m.o'
 failed
make[2]: *** 
[Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/ForwardDeclareProtocol.m.o]
 Error 254
CMakeFiles/Makefile2:670: recipe for target 
'Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/all' failed
make[1]: *** [Test/CMakeFiles/ForwardDeclareProtocolAccess_legacy.dir/all] 
Error 2
Makefile:162: recipe for target 'all' failed
make: *** [all] Error 2