Re: TARGET_OS_MAC section generates a compile error on an iPhone project?
Re: TARGET_OS_MAC section generates a compile error on an iPhone project?
- Subject: Re: TARGET_OS_MAC section generates a compile error on an iPhone project?
- From: Tito Ciuro <email@hidden>
- Date: Fri, 27 Aug 2010 14:05:04 -0400
Excellent!
Thanks Kyle!
-- Tito
On 27/08/2010, at 14:02, Kyle Sluder wrote:
> Read this: http://sealiesoftware.com/blog/archive/2010/8/16/TargetConditionalsh.html
>
> --Kyle Sluder
> (Sent from the road)
>
> On Aug 27, 2010, at 1:47 PM, Tito Ciuro <email@hidden> wrote:
>
>> Hello,
>>
>> I have code that's part of a framework and I'd like to port it to iOS. I tried isolating the code like so:
>>
>> //
>> // RootViewController.m
>> // iPhoneTest
>>
>> #import "RootViewController.h"
>>
>> @implementation RootViewController
>>
>>
>> #pragma mark -
>> #pragma mark View lifecycle
>>
>> - (void)viewWillAppear:(BOOL)animated {
>> [super viewWillAppear:animated];
>> }
>>
>> - (NSUInteger)systemPageSize
>> {
>> static NSUInteger __sSystemPageSize = NSNotFound;
>>
>> #if TARGET_OS_MAC
>> if (NSNotFound == __sSystemPageSize) {
>> NSTask *task = [[NSTask alloc] init];
>>
>> // <do something here...>
>>
>> [task release];
>> }
>> #elif TARGET_OS_IPHONE
>>
>> // <do something here...>
>>
>> #endif
>>
>> return __sSystemPageSize;
>> }
>>
>> When I compile the standard iPhone boilerplate app from Xcode I get the following error:
>>
>>> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m: In function '-[RootViewController systemPageSize]':
>>> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error: 'NSTask' undeclared (first use in this function)
>>> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error: (Each undeclared identifier is reported only once
>>> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error: for each function it appears in.)
>>> /Users/tciuro/Desktop/iPhoneTest/Classes/RootViewController.m:23: error: 'task' undeclared (first use in this function)
>>> {standard input}:59:non-relocatable subtraction expression, "L_OBJC_SELECTOR_REFERENCES_0" minus "L00000000001$pb"
>>> {standard input}:59:symbol: "L_OBJC_SELECTOR_REFERENCES_0" can't be undefined in a subtraction expression
>>> {standard input}:54:non-relocatable subtraction expression, "L_OBJC_CLASSLIST_SUP_REFS_$_0" minus "L00000000001$pb"
>>> {standard input}:54:symbol: "L_OBJC_CLASSLIST_SUP_REFS_$_0" can't be undefined in a subtraction expression
>>> {standard input}:unknown:Undefined local symbol L_OBJC_CLASSLIST_SUP_REFS_$_0
>>> {standard input}:unknown:Undefined local symbol L_OBJC_SELECTOR_REFERENCES_0
>>
>>
>> I know NSTask doesn't exist on iOS, so I was hoping to implement the method that would work for both Mac and iOS by specifying TARGET_OS_MAC and TARGET_OS_IPHONE. What am I missing?
>>
>> Thanks,
>>
>> -- Tito
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