> On Nov 26, 2014, at 2:14 PM, Quincey Morris 
> <[email protected]> wrote:
> 
> Previously, I also used the .pch file as a place to put some 
> definitions/includes that I used in most .m files, to avoid repeating the 
> same #import in every file. For example, in some projects I’ve done this to 
> get AppDelegate.h available everywhere.

There are two concepts here. One is a prefix header, which is what you describe 
above. The other is precompilation, which speeds up reading the prefix header.

I don't know whether precompilation is obsolete now, but prefix headers 
definitely still work. So I don't think you need to change anything in your 
configuration.

—Jens
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