Icon theme caching utility


gtk4-update-icon-cache [--force] [--ignore-theme-index] [--index-only | --include-image-data] [--source NAME] [--quiet] [--validate] PATH


gtk4-update-icon-cache creates mmapable cache files for icon themes.

It expects to be given the PATH to an icon theme directory containing an index.theme, e.g. /usr/share/icons/hicolor, and writes a icon-theme.cache containing cached information about the icons in the directory tree below the given directory.

GTK can use the cache files created by gtk4-update-icon-cache to avoid a lot of system call and disk seek overhead when the application starts. Since the format of the cache files allows them to be shared across multiple processes, for instance using the POSIX mmap() system call, the overall memory consumption is reduced as well.


--force, -f

Overwrite an existing cache file even if it appears to be up-to-date.

--ignore-theme-index, -t

Dont check for the existence of index.theme in the icon theme directory. Without this option, gtk4-update-icon-cache refuses to create an icon cache in a directory which does not appear to be the toplevel directory of an icon theme.

--index-only, -i

Dont include image data in the cache.


Include image data in the cache.

--source, -c

Output a C header file declaring a constant NAME with the contents of the icon cache.

--quiet, -q

Turn off verbose output.

--validate, -v

Validate existing icon cache.

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