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David Sanders e7cc34c2bd [docs] Update ccache on Mac instructions

Change-Id: I619ef54353c23cfeadc91df3bbc28fdf0d825006
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3426041
Auto-Submit: David Sanders <dsanders11@ucsbalum.com>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#969711}

2022-02-11 00:13:23 +00:00

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Using CCache on Mac

ccache is a compiler cache. It speeds up recompilation of C/C++ code by caching previous compilations and detecting when the same compilation is being done again. This often results in a significant speedup in common compilations, especially when switching between branches. This page is about using ccache on Mac with clang and the Ninja build system.

[TOC]

Installation

To install ccache with Homebrew, run brew install ccache. With MacPorts, run port install ccache. You can also download and install yourself, using the instructions in the repository.

Make sure ccache can be found in your $PATH.

Use with GN

You just need to set the cc_wrapper GN variable. You can do so by running gn args out/Default and adding cc_wrapper="env CCACHE_SLOPPINESS=time_macros ccache" to the build arguments.

Build

After setting the cc_wrapper GN variable you can just run ninja as normal:

ninja -C out/Default chrome

Optional Steps

Configure ccache to use a different cache size with ccache -M <max size>. You can see a list of configuration options by calling ccache alone.

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