Compile Objective-C on the command-line with clang

compile-objc.sh

# -fobjc-arc: enables ARC
# -fmodules: enables modules so you can import with `@import AppKit;`
# -mmacosx-version-min=10.6: support older OS X versions, this might increase the binary size

clang main.m -fobjc-arc -fmodules -mmacosx-version-min=10.6 -o main

main.m

@import Foundation;

int main() {
	@autoreleasepool {
		NSArray *args = [[NSProcessInfo processInfo] arguments];

		if (args.count == 1) {
			return 1;
		}

		NSString *input = args[1];

		puts([input UTF8String]);
	}

	return 0;
}

clang: warning: argument unused during compilation: '-mmacosx-version-min=10.6' [-Wunused-command-line-argument]
error: -fobjc-arc is not supported on platforms using the legacy runtime