ios - When i use clang -rewrite-objc main.c.there is "“The current deployment target does not support weak references”" -

int main(int argc, const char * argv[]) { nsmutablearray *a =[[nsmutablearray alloc]init]; @autoreleasepool {     id __weak n = a;     nslog(@"%@",n); } return 0;} // 

this code.build sa os x's command line tool

go through project settings , check disable weak references. since have been default since 10.7 , ios many versions, must have old , obscure project settings.