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README.md
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ccache-clang
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ccache.xcconfig
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README.md

NOTE: As of Xcode 26, content-based caching is built in to LLVM. WebKit enables it via the COMPILATION_CACHE_ENABLE_CACHING build setting and emits cache hit metrics in build logs. Extra diagnostics are available with COMPILATION_CACHE_ENABLE_DIAGNOSTIC_REMARKS=YES.

Prerequisites

  • Xcode < 26 (or opt out of the default compilation caching behavior).
  • ccache(1) installed in /usr/local/bin

Configuring ccache

The maximum cache size is 5GB by default, but a WebKit Debug build can require 20GB or more:

  • ccache --max-size=20G

Building with ccache

  • make ARGS="WK_USE_CCACHE=YES"
  • build-webkit WK_USE_CCACHE=YES
  • Build in the Xcode UI by adding WK_USE_CCACHE = YES; to Tools/ccache/ccache.xcconfig (FIXME: this dirties the working directory).

Viewing cache statistics

  • ccache -s