# `pyproject.toml` Reference

Note that, for the build tools, the keys described in this section are the standard keys. Any of these keys could be removed, or new keys added, by build system extensions including project-specific `project.py` files.

Some string values are interpreted as a Python callable. A callable can be interpreted in three different ways. If the value has a `.py` extension then it is assumed to be the name of a Python script which is then imported. The imported module is then searched for an object that is of a type (or sub-type) expected by the particular key. If the value is a simple name then it is assumed to be the name of a module which is then imported and searched as before. Finally if the value contains an embedded `:` then the part to the left of the `:` is taken to be the name of a module and the part to the right is taken to be the name of a factory callable within the module. The factory is then called to create the required object.

## `[build-system]` Section

The content of this section is defined in PEP 518 and should be similar to the following:

    [build-system]
    requires = ["sip >=5, <6"]
    build-backend = "sipbuild.api"

This specifies that v5 of the `sip` package at PyPI should be used. You may want to adjust the `requires` value if you use features introduced in a later version of SIP.

## `[tool.sip]` Section

The key/values in this section apply to the build system as a whole. Unless stated otherwise, all values are strings.

project-factory

  The value is used to identify a callable that will return an object that is a sub-class of `AbstractProject`. If the value is the name of a `.py` file then that file is evaluated and the resulting module is searched for a type object that is sub-classed from `AbstractProject`. Otherwise the value must be the name of a module to be imported which is then searched for an appropriate type object. The name of the module may have the name of the callable appended (and separated by `:`) in which case the type of the object is ignored. The default project factory is `project.py`.

## `[tool.sip.builder]` Section

Unless stated otherwise, the values of all list options may contain environment markers as defined in PEP 508.

The SIP build system does not define any key/values in this section but build system extensions may do so.

## `[tool.sip.metadata]` Section

The key/values in this section are interpreted as meta-data describing the project as specified in PEP 566. SIP will provide default values for `metadata-version`, `requires-python` and `version`. The only value that must be specified is `name`.

SIP also implements the additional `description-file` key. The value of this is the name of a file (relative to the directory containing `pyproject.toml`) that contains a description of the project. The description is read and appended to the meta-data.

If a value is a list of individual values then the key will be repeated in the generated meta-data for each of those values.

Note that SIP does not check the validity of the key/values in this section.

## `[tool.sip.project]` Section

The key/values in this section apply to the project as a whole. Unless stated otherwise, all values are strings. Unless stated otherwise, the values of all list options may contain environment markers as defined in PEP 508.

abi-version

  The minimum version number of the ABI of the `sip` module being used. If only the major version number is specified then the minor version defaults to 0. By the default the latest major version is used.

api-dir

  The value is the name of a the directory in which a QScintilla `.api` file is created. By default no `.api` file is created. There is also a corresponding command line option.

bindings-factory

  The value is a callable that will return an object that is a sub-class of `Bindings`. The default bindings factory is `Bindings`. Bindings factories can also be specified programmatically using `bindings_factories`.

build-dir

  The value is the name of a directory in which all generated files will be created. The directory will not be removed after the build has been completed. The default depends on which build tool is being used. There is also a corresponding command line option.

build-tag

  The value is the build tag to be used in the name of a wheel. There is also a corresponding command line option.

builder-factory

  The value is a callable that will return an object that is a sub-class of `AbstractBuilder`. For Python v3.10 and later the default builder factory is `SetuptoolsBuilder`. For earlier versions of Python the default builder factory is `DistutilsBuilder`.

compile

  The boolean value specifies if the generated code is to be compiled. By default it is compiled. There is also a corresponding command line option.

console-scripts

  The value is a list of entry points that defines one or more console scripts to be installed as part of the project.

disable

  The value is a list of the names of the bindings that are disabled and will not be built. There is also a corresponding command line option.

dunder-init

  The boolean value specifies if a `__init__.py` file should be installed in the top level package directory. By default it is not installed and the value is ignored for standalone projects. If it is set and at least one set of bindings specify that a Python type hints stub file be generated (by setting the `pep484-pyi` option) then the stub file for the `sip` module and a PEP 561-compatible `py.typed` marker file is also installed.

distinfo

  The boolean value specifies if a `.dist-info` directory is to be created when a project is installed. By default it is enabled. There is also a corresponding command line option.

enable

  The value is a list of the names of the bindings that are enabled and will be built. Any associated configuration tests that would normally be run to determine if the bindings should be built are suppressed. There is also a corresponding command line option.

gui-scripts

  The value is a list of entry points that defines one or more GUI scripts to be installed as part of the project.

manylinux

  The boolean value specifies if support for `manylinux` in the platform tag of a name of a wheel is enabled. By default `manylinux` support is enabled. It should only be disabled if support for older versions of pip is required. There is also a corresponding command line option.

minimum-glibc-version

  The minimum GLIBC version required by the project specified as a 2-tuple of the major and minor version numbers. This is used to determine the correct platform tag to use for Linux wheels. The default version of GLIBC is v2.5 which corresponds to `manylinux1`. It is ignored if the `manylinux` option is False.

minimum-macos-version

  The minimum macOS version required by the project specified as a 2-tuple of the major and minor version numbers. This is used to determine the correct platform tag to use for macOS wheels. The default version is that required by the Python interpreter.

name

  The value is used instead of the value of the `name` key in the `[tool.sip.metadata]` section in the name of an sdist or wheel. There is also a corresponding command line option.

py-debug

  The boolean value specifies if a debug build of Python is being used. By default this is determined dynamically from the Python installation.

py-include-dir

  The value is the name of the directory containing the `Python.h` header file. By default this is determined dynamically from the Python installation.

py-platform

  The value is the target Python platform. By default this is determined dynamically from the Python installation.

py-major-version

  The value is the major version number of the version of Python being targetted. By default this is determined dynamically from the Python installation.

py-minor-version

  The value is the minor version number of the version of Python being targetted. By default this is determined dynamically from the Python installation.

quiet

  The boolean value enables or disables the display of progress messages. By default progress messages are displayed. There is also a corresponding command line option.

scripts-dir

  The value is the name of the directory where any project scripts will be installed in. If name is relative then it is taken as relative to the target directory. By default the directory containing the Python interpreter is used. There is also a corresponding command line option.

sdist-excludes

  The value is a list of files and directories, expressed as glob patterns and relative to the directory containing the `pyproject.toml` file, that should be excluded from an sdist.

sip-files-dir

  The value is the name of the directory containing the `.sip` specification files. If the project is a package project then the `.sip` files of each set of bindings are assumed to be in their own bindings-specific sub-directory. The default value is the name of the directory containing the `pyproject.toml` file.

sip-include-dirs

  The value is a list of additional directories that should be searched for `.sip` files.

sip-module

  The value is the fully qualified package name of the `sip` module. If it is not specified then the project is assumed to be a standalone project.

target-dir

  The value is the name of the directory where the project will be installed in. By default it is the `site-packages` directory of the Python installation. There is also a corresponding command line option.

verbose

  The boolean value enables or disables the display of verbose progress messages. By default verbose progress messages are not displayed. There is also a corresponding command line option.

version-info

  The boolean value determines if the generated code includes a reference to the SIP version number. By default a reference is included. There is also a corresponding command line option.

wheel-includes

  The values is a list of files and directories, specified as glob patterns and relative to the project directory, that should be included in a wheel. If an element of list is a string then it is a pattern and files and directories are installed in the target directory. If an element is a 2-tuple then the first part is the pattern and the # second part is the name of a sub-directory relative to the target directory where the files and directories are installed.

## Bindings Sections

Each set of bindings has its own section called `[tool.sip.bindings.name]` where `name` is the name of the bindings. If no bindings are explicitly defined then SIP will look in the directory containing the `pyproject.toml` file for a `.sip` file with the same name as the value of the `name` key in the `[tool.sip.metadata]` section and, if found, will assume that it defines the bindings of a standalone project.

Unless stated otherwise, all values are strings. Unless stated otherwise, the values of all list options may contain environment markers as defined in PEP 508.

builder-settings

  The value is a list of values that are passed to the builder. It is up to the builder to determine how these values are used.

concatenate

  The value, interpreted as a number, specifies that the generated code is split into that number of source files. By default one file is generated for each C structure or C++ class. Specifying a low value can significantly speed up the build of large projects. There is also a corresponding command line option.

debug

  The boolean value specifies if a build with debugging symbols is performed. By default a debug build is not performed. There is also a corresponding command line option.

define-macros

  The value is a list of `#define` names and values in the form `"NAME"` or `"NAME=VALUE"`.

disabled-features

  The value is a list of disabled `%Feature` tags. There is also a corresponding command line option.

docstrings

  The boolean value specifies if docstrings that describe the signature of all functions, methods and constructors should be generated. By default docstrings are generated. There is also a corresponding command line option.

exceptions

  The boolean values specifies if support for C++ exceptions in the library being wrapped is enabled. By default exception support is disabled.

extra-compile-args

  The value is a list of extra command line arguments to pass to the compiler.

extra-link-args

  The value is a list of extra command line arguments to pass to the linker.

extra-objects

  The value is a list of extra compiled object files to link.

generate-extracts

  The value is a list of extracts (defined by the `%Extract` directive). Each value is the identifier of the extract and the name of the file that the extract is written to separated by a `:`.

headers

  The value is a list of additional `.h` header files needed to build the bindings.

include-dirs

  The value is a list of additional directories to search for `.h` header files.

internal

  The boolean value specifies if the set of bindings are internal. Internal bindings never have `.sip`, `.pyi` or `.api` files installed. By default the bindings are not internal.

libraries

  The value is a list of libraries to link the source code with and should include any library being wrapped.

library-dirs

  The value is a list of directories that will be searched, in addition to the standard system directories, for any libraries.

pep484-pyi

  The boolean value specifies if a Python type hints stub file is generated. This file contains a description of the module’s API that is compliant with PEP 484. By default the stub file is not generated. There is also a corresponding command line option.

protected-is-public

  The boolean value specifies if SIP redefines the `protected` keyword as `public` during compilation. On non-Windows platforms this can result in a significant reduction in the size of a generated Python module. By default SIP redefines the keyword on non-Windows platforms. There is also a corresponding command line option.

release-gil

  The boolean value specifies if the Python GIL is always released when calling a function in the library being wrapped irrespective of any `ReleaseGIL` annotation. By default the GIL is only released as determined by `ReleaseGIL`.

static

  The boolean value specifies that the bindings should be built as a static library. By default the bindings are built as a dynamically loaded library. Note that not all builders (including the default `DistutilsBuilder` builder) can build static libraries.

sip-file

  The name of the `.sip` specification file that defines the set of bindings. If it is a relative name then it is assumed to be relative to the value of the `sip-files-dir` key of the `[tool.sip.project]` section. By default it is the name of the bindings with `.sip` appended.

source-suffix

  The value is the extension used for the generated source files. By default this is `.c` for C bindings and `.cpp` for C++ bindings.

sources

  The value is a list of additional C/C++ source files needed to build the bindings.

tags

  The value is a list of `%Platforms` and `%Timeline` tags used to configure the bindings.

tracing

  The boolean value specifies that debugging statements that trace the execution of the bindings are automatically generated. Be default the statements are not generated. There is also a corresponding command line option.