[cfe-users] LLVM 10.0.1 VS 2019 16.7 Error C2338 with is_trivially_copyable

[Oliver Niebuhr via cfe-users]

Hello.

With Visual Studio 2019 16.7 I am getting the following Error:

[1437/4970]
C:\PROGRA~2\MICROS~2\2019\COMMUN~1\VC\Tools\MSVC\1427~1.291\bin\Hostx64\x64\cl.exe
  /TP -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS
-D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS
-D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-Ilib\ExecutionEngine\RuntimeDyld
-IC:\Dev\GitRepos\llvm-project\llvm\lib\ExecutionEngine\RuntimeDyld
-Iinclude -IC:\Dev\GitRepos\llvm-project\llvm\include /DWIN32 /D_WINDOWS
  /Zc:inline /Zc:strictStrings /Oi /Zc:rvalueCast /W4 -wd4141 -wd4146
-wd4244 -wd4267 -wd4291 -wd4345 -wd4351 -wd4456 -wd4457 -wd4458 -wd4459
-wd4503 -wd4624 -wd4722 -wd4100 -wd4127 -wd4512 -wd4505 -wd4610 -wd4510
-wd4702 -wd4245 -wd4706 -wd4310 -wd4701 -wd4703 -wd4389 -wd4611 -wd4805
-wd4204 -wd4577 -wd4091 -wd4592 -wd4319 -wd4709 -wd4324 -w14062 -we4238
/Gw /MD /O2 /Ob2 /DNDEBUG  /EHsc /GR -std:c++14 /showIncludes
/Folib\ExecutionEngine\RuntimeDyld\CMakeFiles\LLVMRuntimeDyld.dir\RTDyldMemoryManager.cpp.obj
/Fdlib\ExecutionEngine\RuntimeDyld\CMakeFiles\LLVMRuntimeDyld.dir\LLVMRuntimeDyld.pdb
/FS -c
C:\Dev\GitRepos\llvm-project\llvm\lib\ExecutionEngine\RuntimeDyld\RTDyldMemoryManager.cpp

FAILED:
lib/ExecutionEngine/RuntimeDyld/CMakeFiles/LLVMRuntimeDyld.dir/RTDyldMemoryManager.cpp.obj


C:\PROGRA~2\MICROS~2\2019\COMMUN~1\VC\Tools\MSVC\1427~1.291\bin\Hostx64\x64\cl.exe
  /TP -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS
-D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS
-D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-Ilib\ExecutionEngine\RuntimeDyld
-IC:\Dev\GitRepos\llvm-project\llvm\lib\ExecutionEngine\RuntimeDyld
-Iinclude -IC:\Dev\GitRepos\llvm-project\llvm\include /DWIN32 /D_WINDOWS
  /Zc:inline /Zc:strictStrings /Oi /Zc:rvalueCast /W4 -wd4141 -wd4146
-wd4244 -wd4267 -wd4291 -wd4345 -wd4351 -wd4456 -wd4457 -wd4458 -wd4459
-wd4503 -wd4624 -wd4722 -wd4100 -wd4127 -wd4512 -wd4505 -wd4610 -wd4510
-wd4702 -wd4245 -wd4706 -wd4310 -wd4701 -wd4703 -wd4389 -wd4611 -wd4805
-wd4204 -wd4577 -wd4091 -wd4592 -wd4319 -wd4709 -wd4324 -w14062 -we4238
/Gw /MD /O2 /Ob2 /DNDEBUG  /EHsc /GR -std:c++14 /showIncludes
/Folib\ExecutionEngine\RuntimeDyld\CMakeFiles\LLVMRuntimeDyld.dir\RTDyldMemoryManager.cpp.obj
/Fdlib\ExecutionEngine\RuntimeDyld\CMakeFiles\LLVMRuntimeDyld.dir\LLVMRuntimeDyld.pdb
/FS -c
C:\Dev\GitRepos\llvm-project\llvm\lib\ExecutionEngine\RuntimeDyld\RTDyldMemoryManager.cpp

Microsoft (R) C/C++ Optimizing Compiler Version 19.27.29110 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

C:\Dev\GitRepos\llvm-project\llvm\include\llvm/Support/type_traits.h(181):
error C2338: inconsistent behavior between llvm:: and std::
implementation of is_trivially_copyable
C:\Dev\GitRepos\llvm-project\llvm\include\llvm/ADT/SmallVector.h(315):
note: see reference to class template instantiation
'llvm::is_trivially_copyable<T>' being compiled
        with
        [
            T=std::pair<void *,size_t>
        ]
C:\Dev\GitRepos\llvm-project\llvm\include\llvm/ADT/SmallVector.h(837):
note: see reference to class template instantiation
'llvm::SmallVectorImpl<T>' being compiled
        with
        [
            T=std::pair<void *,size_t>
        ]
C:\Dev\GitRepos\llvm-project\llvm\include\llvm/Support/Allocator.h(378):
note: see reference to class template instantiation
'llvm::SmallVector<std::pair<void *,size_t>,0>' being compiled
C:\Dev\GitRepos\llvm-project\llvm\include\llvm/Support/Allocator.h(435):
note: see reference to class template instantiation
'llvm::BumpPtrAllocatorImpl<AllocatorT,SlabSize,SizeThreshold>' being
compiled

C:\Dev\GitRepos\llvm-project\llvm\include\llvm/ADT/SmallVector.h(315):
error C2976: 'llvm::SmallVectorTemplateBase': too few template arguments
C:\Dev\GitRepos\llvm-project\llvm\include\llvm/ADT/SmallVector.h(179):
note: see declaration of 'llvm::SmallVectorTemplateBase'
--- END ---

CMake: 3.18.0
Ninja: 1.10
LLVM: 10.0.1 Git Branch

Works with: VS 2019 16.6.5, 16.6.6

Additional Compiler Flags tested: /std:c++17 (which gets overwritten
with /std:c++14 no matter what), /permissive and /permissive-

I looked through the Interweb but did only found 2 old LLVM Bug Reports
for LLVM 7.x which are closed.

Everything points to being an "underwhelming" work around in LLVM.
Therefore: Is this a Problem with LLVM or do I need to Report this to
the VS Team?
Thanks!
Oliver

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