[program-l] Re: GCC on the mac - help!
- From: Michael Taboada <ai5hf@xxxxxxxxxxx>
- To: program-l@xxxxxxxxxxxxx
- Date: Fri, 13 Jun 2014 10:37:54 -0500
Hello,
I'm not very familiar with objective c, but I'll give it a go:
I'm not sure if this book is old or what, but from all the code I've
seen on the apple developer website, you need to do something like
#import <foundation/foundation.h>
or something similar, and that should import all the basic classes
needed like object, etc. If this book is old perhaps the objc/Object.h
is not what needed to be included anymore, as honestly I've never seen
that in any example code I've been through on apple's developer website.
Hth,
-Michael.
On 6/11/2014 9:58 AM, LaMar Upshaw wrote:
Hello,
I need some help here. I am learning to program with objective-C using a
macbook pro with command line tools from Xcode 5.1, running on os X Mavericks.
I'm not sure if the problem is the example code in the beginners guide to
objective-c book, or the GCC not being properly installed. Below is the sample
code, and the the error given by GCC, along with the GCC version:
GCC version:
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
--with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.2.0
Thread model: posix
Sample code:
hello.m
/* Comments:
** Example written by Pascal Bourguignon
** return status change by Chris B. Vetter
** Added comments in empty {} section by Chris B. Vetter
** int main() changed to int main(void) by Dennis Leeuw
** from comments by Chris B. Vetter
*/
#include <objc/Object.h>
@interface Greeter:Object
{
/* This is left empty on purpose:
** Normally instance variables would be declared here,
** but these are not used in our example.
*/
}
- (void)greet;
@end
#include <stdio.h>
@implementation Greeter
- (void)greet
{
printf("Hello, World!\n");
}
@end
#include <stdlib.h>
int main(void)
{
id myGreeter;
myGreeter=[Greeter new];
[myGreeter greet];
[myGreeter free];
return EXIT_SUCCESS;
}
Errors and warnings:
gcc -lobjc hello.m -o hello
hello.m:11:20: error: cannot find interface declaration for 'Object', superclass
of 'Greeter'
@interface Greeter:Object
~~~~~~~~~~~~~~~~~~ ^
hello.m:11:12: warning: class 'Greeter' defined without specifying a base class
[-Wobjc-root-class]
@interface Greeter:Object
^
hello.m:11:19: note: add a super class to fix this problem
@interface Greeter:Object
^
hello.m:39:20: warning: class method '+new' not found (return type defaults to
'id') [-Wobjc-method-access]
myGreeter=[Greeter new];
^~~
hello.m:43:12: warning: instance method '-free' not found (return type defaults
to 'id') [-Wobjc-method-access]
[myGreeter free];
^~~~
3 warnings and 1 error generated.
Thanks for any help anyone can offer. I really do appreciate it.
Lamar
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