tests: opt-in ccache support#1529
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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Adds opt-in ccache support for test builds. When
USE_CCACHE=1is set, cmake is configured to use ccache as the compiler launcher. The ccache environment is set up so that the cache is shared across pytest runs despite each run building in a new temp directory. With the compiler cache, test suite wall time is reduced by roughly 30-40%.Usage
Benchmark
Without ccache (baseline):
First run with ccache:
Second run with ccache: