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# Ccache architecture
## Code structure
### Top-level directories
* `ci`: Utility scripts used in CI.
* `cmake`: CMake scripts.
* `doc`: Documentation.
* `dockerfiles`: Dockerfiles that specify different environments of interest for
ccache.
* `misc`: Miscellaneous utility scripts, example files, etc.
* `src`: Source code. See below.
* `test`: Integration test suite which tests the ccache binary in different
scenarios.
* `unittest`: Unit test suite which typically tests individual functions.
### Subdirectories of `src`
* `ccache`: Ccache source code.
* `third_party`: Bundled third party code.
### Subdirectories of `src/ccache`
This section describes the directory structure that the project aims to
transform the `src/ccache` directory into in the long run to make the code base
easier to understand and work with. In other words, this is work in progress.
* `compiler`: Knowledge about things like compiler options, compiler behavior,
preprocessor output format, etc. Ideally this code should in the future be
refactored into compiler-specific frontends, such as GCC, Clang, NVCC, MSVC,
etc.
* `core`: Everything not part of other directories.
* `storage`: Storage backends.
* `storage/local`: Code for the local storage backend.
* `storage/remote`: Code for remote storage backends.
* `util`: Generic utility functionality that does not depend on ccache-specific
things.
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