[clang] d1ca996 - document -fpch-instantiate-templates in release notes

[Luboš Luňák via cfe-commits]

Author: Luboš Luňák
Date: 2020-07-14T23:18:27+02:00
New Revision: d1ca9960bc1930bed49dd19b4ff442a9de13a0de

URL: https://github.com/llvm/llvm-project/commit/d1ca9960bc1930bed49dd19b4ff442a9de13a0de
DIFF: https://github.com/llvm/llvm-project/commit/d1ca9960bc1930bed49dd19b4ff442a9de13a0de.diff

LOG: document -fpch-instantiate-templates in release notes

This should have been included in D69585.

Differential Revision: https://reviews.llvm.org/D83622

Added: 
    

Modified: 
    clang/docs/ReleaseNotes.rst

Removed: 
    


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diff  --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 8a9a58aa01f8..8b27e663d9f8 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -108,6 +108,13 @@ New Compiler Flags
   By default, this is ~/.cache but on some platforms or installations, this
   might be elsewhere. The -fmodules-cache-path=... flag continues to work.
 
+- -fpch-instantiate-templates tries to instantiate templates already while
+  generating a precompiled header. Such templates do not need to be
+  instantiated every time the precompiled header is used, which saves compile
+  time. This may result in an error during the precompiled header generation
+  if the source header file is not self-contained. This option is enabled
+  by default for clang-cl.
+
 Deprecated Compiler Flags
 -------------------------