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---
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short-description: Code formatting
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...
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# clang-format
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*Since 0.50.0*
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When `clang-format` is installed and a `.clang-format` file is found at the main
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project's root source directory, Meson automatically adds a `clang-format` target
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that reformat all C and C++ files (currently only with Ninja backend).
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```sh
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ninja -C builddir clang-format
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```
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*Since 0.58.0*
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It is possible to restrict files to be reformatted with optional
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`.clang-format-include` and `.clang-format-ignore` files.
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The file `.clang-format-include` contains a list of patterns matching the files
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that will be reformatted. The `**` pattern matches this directory and all
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subdirectories recursively. Empty lines and lines starting with `#` are ignored.
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If `.clang-format-include` is not found, the pattern defaults to `**/*` which
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means all files recursively in the source directory but has the disadvantage to
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walk the whole source tree which could be slow in the case it contains lots of
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files.
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Example of `.clang-format-include` file:
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```
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# All files in src/ and its subdirectories
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src/**/*
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# All files in include/ but not its subdirectories
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include/*
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```
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The file `.clang-format-ignore` contains a list of patterns matching the files
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that will be excluded. Files matching the include list (see above) that match
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one of the ignore pattern will not be reformatted. Unlike include patters, ignore
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patterns does not support `**` and a single `*` match any characters including
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path separators. Empty lines and lines starting with `#` are ignored.
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The build directory and file without a well known C or C++ suffix are always
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ignored.
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Example of `.clang-format-ignore` file:
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```
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# Skip C++ files in src/ directory
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src/*.cpp
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```
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Note that `.clang-format-ignore` has the same format as used by
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[`run-clang-format.py`](https://github.com/Sarcasm/run-clang-format).
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A new target `clang-format-check` has been added. It returns an error code if
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any file needs to be reformatted. This is intended to be used by CI.
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