[PATCH] D125180: [Frontend] when attaching a preamble, don't generate the long predefines buffer.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
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We know we're going to overwrite it anyway.
It'd be a bit of work to coordinate not generating it at all, but setting this
flag avoids generating ~10k of the 13k string.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125180

Files:
  clang/lib/Frontend/PrecompiledPreamble.cpp


Index: clang/lib/Frontend/PrecompiledPreamble.cpp
===================================================================
--- clang/lib/Frontend/PrecompiledPreamble.cpp
+++ clang/lib/Frontend/PrecompiledPreamble.cpp
@@ -765,6 +765,10 @@
   PreprocessorOpts.DisablePCHOrModuleValidation =
       DisableValidationForModuleKind::PCH;
 
+  // So don't bother generating the long version of the predefines buffer.
+  // The is going to overwrite it anyway (to almost nothing).
+  PreprocessorOpts.UsePredefines = false;
+
   setupPreambleStorage(*Storage, PreprocessorOpts, VFS);
 }
 


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