Pyxel can't be compiled on Intel Mac

[kitao]

On Intel Mac with the recent Xcode environment, Pyxel can't be compiled. The situation is similar for Github Actions' hosted runner.
The error happens while compiling SDL2 via rust-sdl2 and the error message is ld: library not found for -lstdc++.

In the case of declaring CXXFLAGS="-stdlib=libc++", compilation itself is finished without errors, but runtime error symbol not found in flat namespace'___isPlatformVersionAtLeast' happens when the Python module wrapped by PyO3 and Maturin is imported.

Regardless of declaring the env variable, Pyxel can be compiled and works on Apple Silicon Mac.

Does anyone know how to resolve this issue?
(Especially @messense , do you have any idea?)

[messense]

Can you try maturin==0.13.7? I suspect it has something to do with MACOSX_DEPLOYMENT_TARGET set to 10.7 by default on x86_64 macOS in maturin 0.14.

symbol not found in flat namespace'___isPlatformVersionAtLeast'

It's the same issue as alexcrichton/curl-rust#279, can be resolved by linking to clang_rt.

[messense]

Regardless of declaring the env variable, Pyxel can be compiled and works on Apple Silicon Mac.

clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of OS X 10.9 [-Wdeprecated]

arm64 macOS uses MACOSX_DEPLOYMENT_TARGET=11.0 you can try set MACOSX_DEPLOYMENT_TARGET=10.9 on x86_64 macOS.

[kitao]

@messense Maturin 0.13.7 worked!

[kitao]

The environments I tried were macos-12 for aarch64-apple-darwin and macos-12 for x86_64-apple-darwin on GitHub Actions. The built binaries worked on my M1 Mac on Ventura and Intel Mac on Ventura respectively.

[kitao]

@messense Should I keep to use Maturin 0.13.7 or update the latest one?

[messense]

I think you can stick with 0.13.7 for now, upgrade to new version until PyO3/maturin#1252 is implemented.

If you want to use the latest version, add the MACOSX_DEPLOYMENT_TARGET=10.9 (or other macOS version, maybe 10.12 is a good choice given rust-lang/rust#104385) environment variable should work.

[messense]

BTW, this behavior change in 0.14 is now documented in https://www.maturin.rs/migration.html#macos-deployment-target-version-defaults-what-rustc-supports