Incorrect _MSVC_LANG when compiling with /std:c++latest

[ChoonHo]

OS

Windows 10

IDE

Visual Studio 19

Compiler

Intel(R) oneAPI DPC++ compiler

Toolkit

oneAPI Base Toolkit version 2021.1-beta09

Problem

msvc and clang report a value of 201704 whereas DPC++ reports 201703, which causes _HAS_CXX20 to be defined as 0, in turn, disabling C++20 features.

Currently, my workaround is to add -Xclang -std=c++20 which reports a value of 201705. However, SYCL headers are incompatible with C++20 std.

[PrasanthD_intel · Accepted solution]

Hi,

This is a known issue that while using /std:c++latest with dpcpp in windows, you will face some errors.

Please refer the below release notes for more info: https://software.intel.com/content/www/us/en/develop/articles/intel-oneapi-dpcpp-compiler-release-notes-beta.html

We will inform this issue to our internal team.

Regards

Prasanth

[ChoonHo]

I see, must have missed it.

[PrasanthD_intel]

Hi,

Thanks for the confirmation. We will be closing the thread for now.

Please raise a new thread if you require any additional assistance.

Regards

Prasanth