CCache: Difference between revisions
imported>Terinjokes rewrote to use NixOS module and to cleanup non-nixos instructions |
Not related to NixOS, read https://ccache.dev/manual/4.8.2.html#_cache_statistics and run ccache -vs |
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</syntaxhighlight> | </syntaxhighlight> | ||
Note, that if the package is a top-level package, you | Some packages do not use <code>stdenv</code> directly. You may need to plumb it through other dependencies first. | ||
Note, that if the package is a top-level package, you may instead add it to the <code>programs.ccache.packageNames</code> list. | |||
<syntaxhighlight lang="nix"> | <syntaxhighlight lang="nix"> | ||
programs.ccache.packageNames = [ "ffmpeg" ]; | programs.ccache.packageNames = [ "ffmpeg" ]; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
=== System CCache === | === System CCache === | ||
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== Non-NixOS == | == Non-NixOS == | ||
Create the cache folder: | |||
<pre> | <pre> | ||
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</pre> | </pre> | ||
== | == Sloppiness == | ||
By default, <code>stdenv</code> inserts <code>-frandom-seed</code> C compiler flag with a value that changes whenever the derivation hash has changed. | |||
Consequently, this behavior completely defeats any usage of <code>ccacheWrapper</code> | |||
To counterpart this behavior, add the following line to the ccache config (typically <code>/var/cache/ccache/ccache.conf</code>): | |||
<pre> | |||
sloppiness = random_seed | |||
</pre> | |||
Be warned that this configuration option might affect reproducibility of builds, and could lead to cache poisoning. | |||
See [https://github.com/NixOS/nixpkgs/issues/109033 issue 109033] for more details. | |||
== See also == | == See also == | ||