298246 2025-09-02 10:19:56 -0700 [CSS] process-css-properties.py gperf warning: 1 input keys have identical hash values, examine output carefully... 2025-09-03 12:19:21 -0700 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=237213 InRadar P2 Normal --- 1 ddkilzer ddkilzer koivisto webkit-bug-importer oldest_to_newest 2140283 0 ddkilzer 2025-09-02 10:19:56 -0700 [CSS] process-css-properties.py gperf warning: 1 input keys have identical hash values, examine output carefully... ``` PhaseScriptExecution Generate\ Derived\ Sources WebKitBuild/WebCore.build/Debug/Derived\ Sources.build/Script-DD041FBD09D9DDBE0010AF2A.sh (in target 'Derived Sources' from project 'WebCore') cd Source/WebCore /bin/sh -c WebKitBuild/WebCore.build/Debug/Derived\\\ Sources.build/Script-DD041FBD09D9DDBE0010AF2A.sh ruby WebCore/Scripts/GenerateSettings.rb WebKitBuild/Debug/usr/local/include/wtf/Scripts/Preferences/UnifiedWebPreferences.yaml WebCore/page/Settings.yaml --template WebCore/Scripts/SettingsTemplates/InternalSettingsGenerated.idl.erb perl -pe '' WebCore/css/CSSProperties.json > CSSProperties.json /Applications/Xcode.app/Contents/Developer/Toolchains/OSX26.0.xctoolchain/AppleInternal/Library/Frameworks/Python.framework/Versions/3.9/bin/python3.9 "WebCore/css/scripts/process-css-properties.py" --gperf-executable ./gperf --defines "..." 1 input keys have identical hash values, examine output carefully... ``` 2140284 1 webkit-bug-importer 2025-09-02 10:20:40 -0700 <rdar://problem/159680551> 2140287 2 ddkilzer 2025-09-02 10:24:42 -0700 The warning is caused by duplicate aliases of the `font-stretch` alias in `CSSProperties.json`, regardless of the value of `ENABLE_VARIATION_FONTS `: 1. CSS Property: `font-width` (lines 745-788) ```json "font-width": { "codegen-properties": [ { "enable-if": "ENABLE_VARIATION_FONTS", "aliases": ["font-stretch"] }, { "enable-if": "!ENABLE_VARIATION_FONTS", "aliases": ["font-stretch"] } ] } ``` 2. CSS Descriptor: `@font-face/font-width` (lines 12626-12662) ```json "descriptors": { "@font-face": { "font-width": { "codegen-properties": [ { "enable-if": "ENABLE_VARIATION_FONTS", "aliases": ["font-stretch"] }, { "enable-if": "!ENABLE_VARIATION_FONTS", "aliases": ["font-stretch"] } ] } } } ``` These duplicate aliases result in identical entries in `CSSPropertyNames.gperf`, which then trigger the warning: ``` font-stretch, CSSPropertyID::CSSPropertyFontWidth font-stretch, CSSPropertyID::CSSPropertyFontWidth ``` 2140338 3 ddkilzer 2025-09-02 12:24:48 -0700 Pull request: https://github.com/WebKit/WebKit/pull/50194 2140691 4 ews-feeder 2025-09-03 12:19:18 -0700 Committed 299518@main (1774fe051f77): <https://commits.webkit.org/299518@main> Reviewed commits have been landed. Closing PR #50194 and removing active labels.