When use
clang-cl -std:c++17 -Iinclude\c++\v1 hello.cc c++.lib
An error occurred:
In file included from hello.cc:1: In file included from include\c++\v1\iostream:38: In file included from include\c++\v1\ios:216: In file included from include\c++\v1\__locale:15: In file included from include\c++\v1\string:477: In file included from include\c++\v1\string_view:176: In file included from include\c++\v1\__string:56: In file included from include\c++\v1\algorithm:643: In file included from include\c++\v1\memory:656: include\c++\v1\new(165,29): error: redefinition of 'align_val_t' enum class _LIBCPP_ENUM_VIS align_val_t : size_t { }; ^ C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.12.25827\include\vcruntime_new.h(43,16): note: previous definition is here enum class align_val_t : size_t {}; ^ 1 error generated.
vcruntime_new.h has defined align_val_t, libcxx need hide align_val_t.