cppStandard no longer seems to be respected on insiders version

[duncanhorn]

Type: LanguageService

Describe the bug

• OS and Version: Windows 1803(?) update
• VS Code Version: 1.34.0-insiders
• C/C++ Extension Version: 0.23.0-insiders

To Reproduce

1. Have the above installed.
2. Create a blank directory and open it in Code Insiders
3. Create a new cpp file and write the contents:

#include <string_view>

std::string_view s = "foo";

There will be red squiggles on std::string_view. You can edit the c_cpp_properties.json file to include the line "cppStandard": "c++17", but that doesn't seem to help. No matter what the deduced C++ version is always less than C++17 (C++14?).

Expected behavior
Once adding "cppStandard": "c++17" to the configuration file, C++17 features should not give intellisense errors.

[sean-mcmanus]

Thanks a lot for reporting this -- it'll be fixed for our next update (probably Monday).

The bug repros with msvc-x64 mode.

[duncanhorn]

Thanks for the quick turnaround!

[sean-mcmanus]

@Lennon925 The C++17 problem should be fixed with 0.23.0-insiders2: https://github.com/Microsoft/vscode-cpptools/releases/tag/0.23.0-insiders2

There might be some C++20 features incorrectly enabled, but we plan to add a new setting for that later.