Re: Workaround for "Symbol not found: _SCDynamicStoreCreate" on 10.4?
Re: Workaround for "Symbol not found: _SCDynamicStoreCreate" on 10.4?
- Subject: Re: Workaround for "Symbol not found: _SCDynamicStoreCreate" on 10.4?
- From: Sidney San Martín <email@hidden>
- Date: Fri, 27 Aug 2010 11:56:37 -0400
Thanks a lot, Greg!
The reordering workaround makes me feel funny inside, but it does
appear to work.
<rdar://problem/8363909> has been filed.
-Sidney
On Tue, Aug 24, 2010 at 2:51 AM, Greg Parker <email@hidden> wrote:
> On Aug 23, 2010, at 12:46 PM, Greg Parker wrote:
>> On Aug 23, 2010, at 12:20 PM, Sidney San Martín wrote:
>>> I'm developing for 10.4.11 and up, using -respondsToSelector: and
>>> NSClassFromString() to target different OSs at runtime, and it's gone
>>> super-smoothly so far.
>>>
>>> I just ran into an issue I can't figure out on my own. When I link to
>>> the System Configuration framework and IOKit, and target 10.4, calling
>>> some SystemConfiguration framework functions crashes my application
>>> with "Symbol not found: _SCDynamicStoreCreate".
>>>
>>> This happens if I use any base SDK newer than 10.4, which is a bad
>>> thing for this project.
>>
>> This looks like a bug in the SDKs. I don't see the appropriate magic symbols that tell the linker the OS version when the function moved from IOKit to SystemConfiguration. You should file a bug report.
>>
>> You can use dlsym() to work around the problem.
>
> You can also be able to work around this by fiddling with the framework link order in your build. The problem is that you want the symbol from SystemConfiguration, but instead you're getting the symbol from IOKit. This dies on 10.4 because the symbol was not in IOKit then. If you can modify the link order so that SystemConfiguration comes before IOKit in the linker command, then the linker should choose the symbol from SystemConfiguration.
>
> To do this in Xcode:
> 1. Find your app in the Targets list on the left side of the project window.
> 2. Open the Link Binary With Libraries build phase.
> 3. Drag SystemConfiguration.framework to the top of the list.
>
>
> --
> Greg Parker Runtime Wrangler
>
>
>
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