Bugzilla Link	40547
Resolution	FIXED
Resolved on	Nov 27, 2019 11:59
Version	8.0
OS	Linux
Blocks	#42705
CC	@asb,@dexonsmith,@foutrelis,@zmodem,@LW-archlinux,@slacka,@marxin,@zygoloid,@tstellar
Fixed by commit(s)	r372281 7fc9f12

Extended Description

Building clang 8.0.0rc1 for fedora using gcc 9 compiles file, but validation fails in ~150 places.

When building with -O0, everything validates fine.
When building with -O1, everything validates fine.
When building with -O2, validation fails.
When building with -O2 -fsanitize=address, everything validates fine.

Running clang under valgrind gives good hint on the error location:

valgrind /builddir/build/BUILD/cfe-8.0.0rc1.src/_build/bin/clang -cc1 -internal-isystem /builddir/build/BUILD/cfe-8.0.0rc1.src/_build/lib64/clang/8.0.0/include -nostdsysteminc -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm /builddir/build/BUILD/cfe-8.0.0rc1.src/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp -o -

==2582== Conditional jump or move depends on uninitialised value(s)
==2582== at 0x880DC79: clang::CodeGen::CodeGenModule::ConstructAttributeList(llvm::StringRef, clang::CodeGen::CGFunctionInfo const&, clang::CodeGen::CGCalleeInfo, llvm::AttributeList&, unsigned int&, bool) (CGCall.cpp:2060)
==2582== by 0x8A1E749: clang::CodeGen::CodeGenModule::SetLLVMFunctionAttributes(clang::GlobalDecl, clang::CodeGen::CGFunctionInfo const&, llvm::Function*) (CodeGenModule.cpp:1171)
==2582== by 0x8A238AA: clang::CodeGen::CodeGenModule::SetFunctionAttributes(clang::GlobalDecl, llvm::Function*, bool, bool) (CodeGenModule.cpp:1548)
==2582== by 0x8A5CA16: clang::CodeGen::CodeGenModule::GetOrCreateLLVMFunction(llvm::StringRef, llvm::Type*, clang::GlobalDecl, bool, bool, bool, llvm::AttributeList, clang::CodeGen::ForDefinition_t) (CodeGenModule.cpp:2824)
==2582== by 0x87F7FAC: clang::CodeGen::CodeGenModule::getAddrOfCXXStructor(clang::CXXMethodDecl const*, clang::CodeGen::StructorType, clang::CodeGen::CGFunctionInfo const*, llvm::FunctionType*, bool, clang::CodeGen::ForDefinition_t) (CGCXX.cpp:253)
==2582== by 0x882255E: clang::CodeGen::CodeGenFunction::EmitCXXConstructorCall(clang::CXXConstructorDecl const*, clang::CXXCtorType, bool, bool, clang::CodeGen::Address, clang::CodeGen::CallArgList&, clang::CodeGen::AggValueSlot::Overlap_t, clang::SourceLocation, bool) (CGClass.cpp:2134)
==2582== by 0x882343C: clang::CodeGen::CodeGenFunction::EmitCXXConstructorCall(clang::CXXConstructorDecl const*, clang::CXXCtorType, bool, bool, clang::CodeGen::Address, clang::CXXConstructExpr const*, clang::CodeGen::AggValueSlot::Overlap_t, bool) (CGClass.cpp:2052)
==2582== by 0x88B1B79: clang::CodeGen::CodeGenFunction::EmitCXXConstructEx

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