I'm trying to update all my projects to C++20. The C++ only projects work fine. All the Objective-C++ files, though, suddenly stop compiling. Is this supposed to work. I can't imagine [NSString stringWithUTF8String:foo] should be failing. Setting the project back to C++17 works.
I do have -fmodules and -fcxx-modules for clang modules in some projects. Do those all need to be removed for C++20 modules?
This is all fine, but C++20 modules don't apply to Objective-C and C++ libraries. Would be nice to just have this work, so interop continues to work. I had to go through and replace all @import usages with #import.
Also seems like one of the main reasons to switch to C++20 isn't implemented either - C++20 modules. So I can't seem to still use clang modules, and can't switch to C++20 modules.
I hope It can be fixed in Xcode 14 final version.
So sad, Xcode 14 RC has same issue.