Re: What?
Re: What?
- Subject: Re: What?
- From: Julian Vrieslander <email@hidden>
- Date: Fri, 30 May 2008 11:24:51 -0700
- Fnork: garbanzo
- Thread-topic: What?
Title: Re: What?
Build Fixed-Position Application Code
By default, most code is built with the -dynamic compiler option. This option enables indirect symbol addressing and position-independent code generation, which allows the generated code to be relocated within the virtual memory space of the process. For projects such as bundles and frameworks, this option is required. The dynamic-linker must be able to relocate the bundle or framework and patch up symbol references at runtime.
Unlike bundles and frameworks, applications do not need the position-independent code generation feature provided by the -dynamic option. Application code is never relocated within the process space. However, it does still require the indirect addressing feature to allow for dynamic linking to other code modules, such as bundles. To solve this problem, the GCC versions 3.1 and later support the -mdynamic-no-pic option, which disables position-independent code generation but allows indirect symbol addressing. You should always enable this option when building applications.
Note: In Xcode, you specify the -mdynamic-no-pic option by choosing the Generate Position Independent Code option from the Code Generation settings.
My head is spinning. I don’t see an option to “Generate Position Independent Code” in Xcode 2.5. I do see a checkbox option to “Generate Position Dependent Code”. I am building a Cocoa app which links to frameworks. If I understand the gist of this thread, I will get a slight performance benefit if I check the option to “Generate Position Dependent Code” in the app target build settings. Please correct me if I’m wrong.
--
Julian Vrieslander <email@hidden>
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