Question

I am getting this error when i try to compile Object-c program in cygwin Windows 7, but this program executed in Xcode.

main.m:5:3: error: ‘NSString’ undeclared (first use in this function)

#include <stdio.h>    
int main (int argc, const char * argv[]) 

  {
        NSString *str1 = @"1st string";
        NSString *str2 = @"2nd string";         
        NSLog(@"Hello, World!");    
    return 0;
}

Executed using the following CMD in cygwin,

gcc -c -Wno-import main.m

can you one help me how solve this compilation error.

Answer 1

Windows doesn’t come with a Foundation library, so NSString isn’t available by default. You should try GNUstep or you could cross-compile from Xcode on a Mac using Cocotron. Whichever you choose, look at its documentation to find out how to use it (at a minimum you’ll need to #import <Foundation/Foundation.h> and link the Foundation library).