C++17 supported in WASM?

[MSFS 2024] Questions & Community Discussions WASM
1

Hello,
I’m trying to understand if C++17 is fully supported in WASM builds:
I have enabled it here:

image
image968×140 4.92 KB

but if I do:

#if __cplusplus < 201703L
# error My library requires C++17!
#endif

I get the error.
Adding /Zc:__cplusplus seems to correctly inform Intellisense and __cplusplus becomes 201703L in VS editor but only for Intellisense, because if I do:

#pragma message("__cplusplus = " VALUE(__cplusplus))

in the build output I see __cplusplus = 201402L

so it seems MSBuild is compiling with C++14 anyway