Bug 253859

Summary:	Add additional STL things to PCH files
Product:	WebKit	Reporter:	Brent Fulgham <bfulgham>
Component:	WebKit Misc.	Assignee:	Brent Fulgham <bfulgham>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Brent Fulgham 2023-03-13 17:27:39 PDT

Flamegraphs of the build revealed a few STL headers, and one OS logging header, that are particularly costly. Adding them to our precompiled header set shows a measurable reduction in build time.

Prior to this change:
**** Time summary:
Compilation (10204 times):
  Parsing (frontend):         9250.1 s
  Codegen & opts (backend):   3311.8 s

With this change:
**** Time summary:
Compilation (10202 times):
  Parsing (frontend):         8907.4 s
  Codegen & opts (backend):   3189.9 s

Comment 1 Radar WebKit Bug Importer 2023-03-13 17:28:05 PDT

<rdar://problem/106673843>

Comment 2 Brent Fulgham 2023-03-13 17:31:28 PDT

Pull request: https://github.com/WebKit/WebKit/pull/11471

Comment 3 EWS 2023-03-14 10:09:47 PDT

Committed 261636@main (25b5fe6befd0): <https://commits.webkit.org/261636@main>

Reviewed commits have been landed. Closing PR #11471 and removing active labels.