Home/ Questions/Q 8210957
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-07T10:15:43+00:00

I just reopened a project that was set to use Garbage Collection, and that

  • 0

I just reopened a project that was set to use Garbage Collection, and that I had last opened in Xcode 3. Now opening it again in Xcode 4.5, and looking to modernize it, I am trying to switch on ARC. However, when building, it resulted in clang error 1. Looking into more details in the Xcode logs, I saw the message:

clang: error: cannot specify both ‘-fobjc-arc’ and ‘-fobjc-gc-only’

Ah, I need to switch off Garbage Collection, which I was using before. However, when searching the build setting for the word ‘garbage’ or ‘collection’, I can’t find the setting in Xcode (using the search field in the Build Settings in the target info).

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Probably because garbage collection is now deprecated, the setting has been turned into a user-defined setting, and is using the gcc name ‘GCC_ENABLE_OBJC_GC’. This is why it won’t show up when doing a search for ‘garbage’ or ‘collection’. Instead, you have to look for that setting at the bottom of the Build Settings, or search for the string GCC_ENABLE_OBJC_GC using the search field.

    This needs to be done at the project level or at the target level.

    • 0