Object-C的编译命令

#import <Foundation/Foundation.h>
int main(int argc,const char *argv[]){
    @autoreleasepool{
        NSLog(@"Hello world!");
    }
    return 0;
}

$gcc -framework Foundation -x objective-c -o hello  main.m

-x选项说明编译objective-c，-framework选项应该是制定Library的