All Objective-C++ code breaks when setting C++20

Question

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?

LLVM

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Posted by

Alecazam

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Answer 1

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.

Posted by

Alecazam

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Answer 2

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.

Posted by

Alecazam

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Answer 3

I hope It can be fixed in Xcode 14 final version.

Posted by

liaowei

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Answer 4

So sad, Xcode 14 RC has same issue.

Posted by

liaowei

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All Objective-C++ code breaks when setting C++20

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