C++ Language Standard missing C++17 (GNU Dialect) (-std=gnu++1z) option for Android NDK r15c Clang 5.0 on MSVS 2017 15.6.1
Android NDK r15c uses Clang 5.0 which supports all of C++14 and is C++17 feature complete (unfortunately, the libc++ runtime that ships in Clang/LLVM 5 only has partial C++17 library features). However, in the properties for native Android projects Visual Studio 2017 15.6.1 the available options for the C++ Language Standard setting hasn't been updated to reflect the latest capabilities of the compiler.
The option "C++14 (GNU Dialect) (-std=gnu++1y)" should be changed to use -std=gnu++14 instead of -std=gnu++1y. Furthermore, a new option should be added "C++17 (GNU Dialect) (-std=gnu++1z)" to enable the available C++17 support.
Currently, it's possible to work around this issue by adding -std=gnu++1z to AdditionalOptions in the Command Line pane of the Properties dialog box, and defining the _LIBCPP_STD_VER to 15 or greater. One might argue you don't want to enable this language mode if it doesn't fully support it, but really MSVC++ 2017 isn't any different in this regard--it too has partial C++17 support (albiet with more library features), yet allows you to make use of what's there.
It also appears that Intellisense for Android can't recognize C++17 syntax. It has trouble on structured bindings for instance and selection statement initializers (new if and switch syntax).
It would be a major boon if the C++14 and C++17 experience in MSVS for Android using NDK 15c & Clang 5 could be improved, especially since we're at a point where a lot of developers are looking at migrating to these newer language standards given the widespread availability of Clang/LLVM 5 based toolchains on a number of different platforms (not just Android).
C++1z is missing in Linux projects too. Btw, I really need C++1z support on Android NDK.
Nvm, I saw that the issue on Linux projects are fixed and pending release.
For Android you can use the -std=c++1z flag workaround for now.
Thank you for your feedback! We have fixed the problem in an upcoming release. Thank you for helping us build a better Visual Studio!
The fix for this is now in our latest Visual Studio Preview release. If you'd like to try out the fix, you can access the preview build here: https://visualstudio.microsoft.com/vs/preview/
Excellent. I also see intellisense is working correctly now for C++17 language features in 15.8 Preview 4 for Android. I was about to open a bug specifically for it as it wasn't working in Preview 3, but now that it's resolved everything seems to be great. I'll continue to test it in the meantime.
Any plans to fix this in Folder projects, too? I tried "compilerSwitches": "-std=gnu++1z" in CppProperties.json with the latest preview, and Intellisense doesn't appear to recognize it.
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