How to Compile obj-C program on mac OS X using gcc compiler

[NishAbe]

hi All,
I am trying to compile the program in 17 of chapter 2 using terminal interface.
Unfortunately it is not succeeding.

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   int n, number, triangularNumber;
   NSLog (@"What triangular number do you want?");
   scanf ("%i", &number);
   triangularNumber = 0;
   for ( n = 1; n <= number; ++n )
      triangularNumber += n;
   NSLog (@"Triangular number %i is %i\n", number, triangularNumber);
   
    [pool drain];
    return 0;
}

The errors are:


: –framework: No such file or directory
: Foundation: No such file or directory
: error: Foundation.h: No such file or directory
: In function 'main':
:4: error: 'NSAutoreleasePool' undeclared (first use in this function)
:4: error: (Each undeclared identifier is reported only once
:4: error: for each function it appears in.)
:4: error: 'pool' undeclared (first use in this function)
:8: warning: incompatible implicit declaration of built-in function 'scanf'

At terminal I enter command as shown below:

gcc –framework /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Foundation.framework/Versions/C/Headers test.m -o prog1


Could you please tell me what is wrong here?

[NishAbe]

Hi , Can anyone help please?

[skochan]

Did you just try the following command line:

Code: (Objective-C)

gcc -framework foundation -std=c99  test.m -o prog1

That's what's listed in the book and what I use all the time

Cheers,

Steve Kochan

[NishAbe]

Thanks for the reply , Stephen.

I tried this too. But did not work.
I did not understand what is -std=c99 or -o.

However I am not stuck with this issue. Today I am starting with the 18th chapter.
Just want to say I LOVE YOUR BOOK.
And hope you will correct all those small typos in the latest version.

As you have mentioned in the book, development with the terminal is not a long term option. I just want to know how to compile and run a basic ObjC program in a terminal.

Do you think we should pass the absolute path to foundation header files along with the command line arguments?
And if that is the case what would be the syntax?

Eager to hear from you....

[skochan]

The -std=c99 says to support ANSI C-99 standards.  It just allows for some special extensions that were made to the underlying C language at that time (e.g., variable length C arrays).   I haven't checked recently, but by default that standard was not supported by the compiler unless that option was specified. 

The -o option specifies the name of the executable file.  I think that's described in the text.

Why doesn't that command line work for you?  Since you're way past that point, you don't have to bother replying, but I'm curious as to what sort of errors you're getting from that command.

Cheers,

Steve

[NishAbe]

Thanks.
I have created a folder progs in the root folder.
The code file is prog1.m.
Then executed the command as below:
gcc -framework foundation -std=c99  prog1.m -o prog1

This is the output that I get:

Aneeshs-Mac-Pro:progs aneesh$ gcc -framework foundation -std=c99  prog1.m -o prog1
prog1.m:1:34: error: Foundation/Foundation.h: No such file or directory
prog1.m: In function 'main':
prog1.m:4: error: 'NSAutoreleasePool' undeclared (first use in this function)
prog1.m:4: error: (Each undeclared identifier is reported only once
prog1.m:4: error: for each function it appears in.)
prog1.m:4: error: 'pool' undeclared (first use in this function)
prog1.m:8: warning: implicit declaration of function 'NSLog'