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: Kyle Sluder <email@hidden>
- Date: Fri, 27 Aug 2010 14:02:35 -0400
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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