[Bug objc/67455] New: Inheriting from Object doesn't provide alloc, init or new rendering methods usless

["jam.hobson at hotmail dot co.uk" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67455

            Bug ID: 67455
           Summary: Inheriting from Object doesn't provide alloc, init or
                    new rendering methods usless
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: objc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jam.hobson at hotmail dot co.uk
  Target Milestone: ---

I have selected version 4.8.1, but other versions have the same problem

When ever I try to instantiate a class using ClassName *foo = [[ClassName
alloc] init]; or ClassName *foo = [ClassName new]; it tells me that +alloc and
-init or -new don't exist. Other people on the internet are having the same
issues

I know that the objc part of GCC has been updated, the bug may be that there
are no updated documents detailing how to use the new version without using
GNUStep or another runtime.

here is an example of the problem:

code:

#import <stdlib.h>
#import <objc/Object.h>

@interface TestObject : Object
{
        int internalInt;
}

- (int)add:(int)anInt;
- (int)subtract:(int)anInt;
- (int)value;

@end


@implementation TestObject

- (id)init
{
        if ((self = [super init]))
        {
                internalInt = 0;
        }

        return self;
}

- (int)add:(int)anInt
{
        internalInt += anInt;
        return internalInt;
}

- (int)subtract:(int)anInt
{
        internalInt -= anInt;
        return internalInt;
}

- (int)value
{
        return internalInt;
}

@end


int main(int argc, char** argv)
{
        TestObject *aTestObject = [[TestObject alloc] init];
        printf("Initial Value: %d\n", [aTestObject value]);
        printf("+45 Value: %d\n", [aTestObject add: 45]);
        printf("-63 Value: %d\n", [aTestObject subtract: 63]);

        [aTestObject add: 103];
        printf("+103 Value: %d\n", [aTestObject value]);

        return (EXIT_SUCCESS);
}

debug error:
gcc -o main main.m -lobjc

main.m: IN function '-{TestObject init]':
main.m:20:2: warning: 'Object' may not respond to '-init' [enabled by default]
   if ((self = [super init]))
   ^
main.m:20:2: warning: (Messages without a matching method signature [enabled by
default]
main.m:20:2: warning will be assumed to return 'id' and accept [enabled by
default]
main.m:20:2: warning: '...' as arguments.) [enabled by default]
main.m: In function 'main':
   TestObject *aTestObject = [[TestObject alloc] init];
   ^
main.m:51:2: warning: incompatible implicit declaration of built-in function
'printf' [enabled by default]
   printf("Initial Value: %d\n", [aTestObject value]);
   ^


Please help!