そういえばmacOSのgccはgccじゃないんよね
$ gcc --versionConfigured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1Apple clang version 13.0.0 (clang-1300.0.29.30)Target: x86_64-apple-darwin20.6.0Thread model: posixInstalledDir: /Library/Developer/CommandLineTools/usr/bin