<div dir="ltr">FWIW, I would really like to see this patch move forward as it has the potential to speed up precompiled headers quite significantly. Currently our internal builds using clang-cl are about 3x slower than MSVC using PCH, and it's likely in large part due to this exact issue.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 13, 2020 at 2:11 PM Lubos Lunak via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Hello,<br>
<br>
would there be somebody who could review <a href="https://reviews.llvm.org/D69585" rel="noreferrer" target="_blank">https://reviews.llvm.org/D69585</a> so <br>
that it can make it into 10.0? I can get significant build time reduction <br>
with the patch when using PCHs (up to 20-30% build time, <br>
<a href="http://llunak.blogspot.com/2019/11/clang-precompiled-headers-and-improving.html" rel="noreferrer" target="_blank">http://llunak.blogspot.com/2019/11/clang-precompiled-headers-and-improving.html</a>), <br>
the patch is fairly simple, I've been using it locally for several months by <br>
now, and it should be pretty safe given that the change is in effect only if <br>
opted in.<br>
<br>
Thank you.<br>
<br>
-- <br>
Lubos Lunak<br>
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