ccache

TLDR

Show cache statistics

$ ccache -s

Clear the cache

$ ccache -C

Set maximum cache size

$ ccache -M [5G]

Show configuration

$ ccache -p

Zero statistics

$ ccache -z

Run compiler through ccache

$ ccache [gcc] -c [file.c]

Show cache directory

$ ccache -k cache_dir

SYNOPSIS

ccache [options]
ccache compiler [compileroptions_]

ccache is a compiler cache that speeds up recompilation by caching previous compilations. When the same compilation is detected, it returns the cached result instead of recompiling.
Supports GCC, Clang, MSVC and similar compilers for C, C++, Objective-C, CUDA, and assembler.

PARAMETERS

-s, --show-stats

Show cache statistics

-z, --zero-stats

Zero statistics counters

-C, --clear

Clear entire cache

-M, --max-size size

Set maximum cache size (e.g., 5G, 500M)

-p, --show-config

Show current configuration

-k, --get-config key

Get configuration value

-o, --set-config key=value

Set configuration value

--cleanup

Clean up cache to stay within size limit

-V, --version

Show version

SETUP

Symlink method:

$ ln -s /usr/bin/ccache /usr/local/bin/gcc
ln -s /usr/bin/ccache /usr/local/bin/g++

Environment variable:

$ export CC="ccache gcc"
export CXX="ccache g++"

REMOTE CACHING

Supports remote caching via HTTP, Redis, or NFS for sharing across build machines.

CAVEATS

Only caches single-file compilations. Multi-file compilation and linking fall back to real compiler. Produces identical output to direct compilation.