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Re: not-used-in-precomps
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Re: not-used-in-precomps

  • Subject: Re: not-used-in-precomps
  • From: Chris Espinosa <email@hidden>
  • Date: Sun, 12 Jun 2005 22:43:40 -0700

On Jun 12, 2005, at 2:33 PM, Fritz Anderson wrote:

About the new (2.1) build setting GCC_PREPROCESSOR_DEFINITIONS_NOT_USED_IN_PRECOMPS...


Am I misconceiving the use of this setting? I had thought that two targets could share a precompiled header, and then one could add a preprocessor definition using this setting, and the change would be "downstream" from the reading of the PCH. So Target A and Target B could both use TargetA.pch, and Target B could additionally specify as ...NOT_USED_IN_PRECOMPS, say, DEBUG=1, and not spoil the precompilation


If I try this (and as the compiler suggested, turn on -Winvalid-pch), I get:


========

cc1obj: warning: /Library/Caches/com.apple.Xcode.503/SharedPrecompiledHeaders/Linear_Prefix-apkchnlmwdltyrczcnulutdqxqdh/Linear_Prefix.pch.gch: not used because `DEBUG' is defined

cc1obj: error: /Library/Caches/com.apple.Xcode.503/SharedPrecompiledHeaders/Linear_Prefix-apkchnlmwdltyrczcnulutdqxqdh/Linear_Prefix.pch: No such file or directory

cc1obj: error: one or more PCH files were found, but they were invalid

========


... which seems to be saying that the presence of a not-in-precomps symbol, so far from permitting the sharing of PCHes, actually prevents it.


Am I missing something, or should I report a bug?


You're not missing anything, that's what it's for.  If you had had DEBUG defined elsewhere, and moved it, then the old precomp would still be around and would be, as you say, invalid.  You might want to just clear out all of /Library/Caches/com.apple.Xcode.503/SharedPrecompiledHeaders/ before your next run, and check again.

The real way to tell whether you're actually sharing is to build target A, then build target B, and see if there is a PrecompilePCH build step in the transcript.  

If this is not happening, file a bug, and please include the contents of all .pch.gch.hash-criteria files from inside the SharedPrecompiledHeaders folder.  They'll tell us what the differences among the headers are.

Chris

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