Bazel attr int. May 31, 2024 · The Skylib bool_flag that represents the build flag within Bazel has a build_setting_default attribute. 5 days ago · dict is a built-in type representing an associative mapping or dictionary. If you were looking for a how-to, please see the Bazel Query How-To. int_list (mandatory=False, allow_empty=True, *, default= [], doc='') Attribute attr. Extensions > API reference > attr attr This is a top-level module for defining the attribute schemas of a rule or aspect. <ATTR>. This document also describes the output formats bazel query supports. int has had the wrong annotation since 0446f99. bazel, and WORKSPACE. 4 · 7. Members abs all any bool dict dir enumerate fail float getattr hasattr hash int len list max min print range repr reversed set sorted str tuple type zip abs Jul 27, 2022 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, If an attribute schema is defined in the rule but no value for that attribute is given when the rule is instantiated, then the rule implementation function will see a placeholder value in ctx. See the Rules page for more on defining and using attributes. int (configurable=unbound, default=0, doc=None, mandatory=False, values= []) Aug 26, 2025 · Last modified: 26 August 2025 Bazel is an open-source build and test tool developed by Google. This includes: Jun 19, 2024 · This is unexpected because both of these attrs have default values, even more confusing is that the string attr with a default value works without requiring example_rule to have an attr of the name example_string_attr. Members bool int int_list label label_keyed_string_dict label_list output 5 days ago · Methods available in all Bazel files, including . For more information about the language, see Starlark's GitHub repo. It includes how to define build settings and provides examples. target_platform_has_constraint to do this directly, without select: def _impl(ctx): darwin_constraint = ctx. 2 · 7. This document is the reference manual for that language. In the course 4 days ago · py_library(name, deps, srcs, data, aspect_hints, compatible_with, deprecation, distribs, exec_compatible_with, exec_group_compatible_with, exec_properties, experimental_venvs_site_packages, features, imports, licenses, package_metadata, precompile, precompile_invalidation_mode, precompile_optimize_level, precompile_source_retention, pyi_deps, pyi_srcs, restricted_to, srcs_version, tags, target 5 days ago · Any attribute that specifies an input label (those defined with attr. Aspect implementation These are examples of dependency attributes. 5 days ago · Representation of a definition of an attribute. You can find a complete list here: https://docs. 6 · 7. This may be a disappointment if you were hoping to provide no default, and have Bazel return errors if no value is explicitly set for a flag (either via a platform, through . bazel. bzl files, BUILD, MODULE. int(*, configurable=unbound, default=0, doc=None, mandatory=False, values=[]) 为整数属性创建架构。值必须在带符号的 32 位范围内。相应的 ctx. label_keyed_string_dict) specifies dependencies of a certain type between a target and the targets whose labels (or the corresponding Label objects) are listed in that attribute when the target is 5 days ago · list(ctx. Members bool int int_list label label_keyed_string_dict label_list output This is a top-level module for defining the attribute schemas of a rule or aspect. For the authoritative specification of the Starlark syntax and behavior, see the Starlark Language Specification. Reversing the dependency order changes which package is successfully imported. int_list(mandatory=False, allow_empty=True, *, default=[], doc=None) 為整數清單屬性建立結構定義。 每個元素都必須位於 32 位元簽署範圍內。 參數 Dec 18, 2023 · Bazel is a powerful tool for building software, but it can be complex. The type is limited to a set of basic Starlark types like bool and string. 3 · 8. 0 7. Contribute to bazelbuild/examples development by creating an account on GitHub. This value has a dual purpose: It is a function that can be called to construct 'struct'-like values: DataInfo = provider() d = DataInfo(x = 2, y = 3) print(d. 2 This is a top-level module for defining the attribute schemas of a rule or aspect. These objects are used as the values of the attrs Report an issue open_in_new View source open_in_new Nightly 8. 4 This is a top-level module for defining the attribute schemas of a rule or aspect. You'll need to use attr. 0 · 7. Usually, the default is good enough, but there are some cas int_list Attribute attr. label_list, attr. Any attribute using this as a value must be private. More on this below. bazel files REPO. Another common argument for attr_aspects is ['*'] which would propagate the aspect to all attributes of a rule. Additional query reference In addition to query, which runs on the post-loading phase target graph, Bazel includes action graph query and configurable query Dec 27, 2024 · Problem Overview While working with Bazel to build Python code from Protocol Buffers, I encountered a perplexing runtime error: Importing the first package in PYTHONPATH works, but subsequent imports from other proto_library targets fail. Members bool int int_list label label_keyed_string_dict label_list output Attribute attr. Dec 20, 2017 · There's an int and a label_list. These objects are used as the values of the attrs Report an issue open_in_new View source open_in_new Nightly · 8. 4 · 8. attr 屬性將為 int 類型。 參數 int_list Attribute attr. build/versions/master/skylark/lib/attr. These objects are used as the values of the attrs 5 days ago · DataInfo = provider() def _rule_impl(ctx) ctx. string() also appears to exist. 1 · 8. attr 屬性將為 int 類型。 參數 Report an issue open_in_new View source open_in_new This is a top-level module for defining the attribute schemas of a rule or aspect. int (configurable=unbound, default=0, doc=None, mandatory=False, values= []) 參數 int Attribute attr. a fast, scalable, multi-language and extensible build system - bazelbuild/bazel. The corresponding ctx. If the schema specifies a default value, that value will be used instead of the placeholder. The Bazel query reference When you use bazel query to analyze build dependencies, you use a little language, the Bazel Query Language. 1 · 7. It is a Extensions > API reference > Provider Provider A constructor for simple value objects, known as provider instances. . Attribute attr. attr_aspects is a list of rule attributes along which the aspect propagates. bazel, VENDOR. Aspect implementation 5 days ago · int string. bazelrc, or on the command line). A dictionary supports indexing using d[k] and key membership testing using k in d; both operations take constant time. find(sub, start=0, end=None) Returns the first index where sub is found, or -1 if no such index exists, optionally restricting to [start:end], start being inclusive and end being exclusive. Syntax Starlark's syntax is inspired by Python3 Any attribute that specifies an input label (those defined with attr. For practical use cases, see the Bazel Query How-To. attr 属性将为 int 类型。 参数 Stay organized with collections Save and categorize content based on your preferences. It looks to me that attr. In this case, the aspect will propagate along the deps attribute of the rules that it is applied to. attr attribute will be of type int. Report an issue open_in_new View source open_in_new Nightly · 8. y) # prints 5 Note: Some providers, defined internally, do not allow instance creation It is a key to access a Jan 16, 2021 · In Bazel you can define an attribute type, which could be int or string or output What does it mean to have a type of attribute as output? Here's an example: def _something(ctx): print(&quo attr_aspects is a list of rule attributes along which the aspect propagates. files struct rule_attributes. Nov 2, 2016 · Description of the problem / feature request / question: select is not enabled as Label default If possible, provide a minimal example to reproduce the problem: foo_repository = repository_rule( im Stay organized with collections Save and categorize content based on your preferences. Members bool int int_list label label_keyed_string_dict label_list output 5 days ago · Configurable attributes, commonly known as select(), is a Bazel feature that lets users toggle the values of build rule attributes at the command line. label(default=configuration_field(fragment Dependency attributes, such as attr. The struct fields correspond to the attribute names. label_keyed_string_dict) specifies dependencies of a certain type between a target and the targets whose labels (or the corresponding Label objects) are listed in that attribute when the target is 5 days ago · This page covers how to build a program with Bazel, build command syntax, and target pattern syntax. label(default=None, doc='', executable=False, allow_files=None, allow_single_file=None, mandatory=False, providers=[], allow_rules=None, cfg=None, aspects=[]) 為標籤屬性建立結構定義。這是依附元件屬性。 此屬性包含不重複的 Label 值。若提供字串來取代 Label，將會使用 標籤建構函式 轉換該字串。標籤路徑的相對部分 (包括 5 days ago · This section lists the global functions available in Starlark. label_keyed_string_dict) specifies dependencies of a certain type between a target and the targets whose labels (or the corresponding Label objects) are listed in that attribute when the target is defined. What else is there? Thanks for the feedback! We'll improve this section in the documentation. See example of use. The config function also takes an optional boolean parameter, flag, which is set to Any attribute that specifies an input label (those defined with attr. This can be used, for example, for a multiplatform library that automatically chooses the appropriate implementation for the architecture, or for a feature-configurable binary that can be customized at build time. dep[DataInfo] Create a new Provider using the provider function. Stay organized with collections Save and categorize content based on your preferences. 5 days ago · This page is an overview of Starlark, formerly known as Skylark, the language used in Bazel. Bazel automates the process of compiling code, linking dependencies, running tests, and deploying artifacts. bool to create an attribute, pass the select to it, and then perform your logic based on that. label, or attr. 2 · 8. Report an issue open_in_new View source open_in_new Nightly · 7. The list of available functions differs depending on the file type (whether a BUILD file, or a . Parameters Attribute attr. Members all analysis_test_transition any archive_override aspect bazel_dep bind bool configuration_field depset dict dir enumerate exec_group fail float getattr git_override hasattr hash int len list local_path_override max min module module_extension multiple_version_override print provider range register_execution_platforms Any attribute that specifies an input label (those defined with attr. 參數 int Attribute attr. See build if you need to make a new workspace. x + d. These objects are used as the values of the Attribute attr. label_list, declare a dependency from the target that owns the attribute to the target whose label appears in the attribute’s value. 0 · 6. Members all analysis_test_transition any archive_override aspect bazel_dep bind bool configuration_field depset dict dir enumerate exec_group fail float getattr git_override hasattr hash int len list local_path_override max min module module_extension multiple_version_override print provider range register_execution_platforms This is a top-level module for defining the attribute schemas of a rule or aspect. This is a top-level module for defining the attribute schemas of a rule or aspect. These objects are used as the values of the attrs Report an issue open_in_new View source open_in_new This is a top-level module for defining the attribute schemas of a rule or aspect. Learn how to retrieve all providers of a target with Bazel. But what are the other options? What other types can be rule attributes? attr. Rule implementation functions generate actions that build artifacts, such as . int(default=0, doc=None, mandatory=False, values=[]) Creates a schema for an integer attribute. 3 · 7. 7. It is designed to manage large codebases with complex dependencies across multiple languages and platforms. You can also use ctx. 4 . They are only for use with a rule or an aspect. 5 This is a top-level module for defining the attribute schemas of a rule or aspect. Bazel analyzes this dependency graph by calling an implementation function of the corresponding rule (in this case "java_library") for every target in the above example. See the config module documentation for details. bazel files configuration_field LateBoundDefault configuration_field(fragment, name) References a late-bound default value for an attribute of type label. bazel files VENDOR. bzl file, etc). int(configurable=unbound, default=0, doc=None, mandatory=False, values=[]) 為整數屬性建立結構定義。值必須位於帶正負號的 32 位元範圍內。對應的 ctx. Members all analysis_test_transition any archive_override aspect bazel_dep bind bool configuration_field depset dict dir enumerate exec_group fail float getattr git_override hasattr hash int len list local_path_override max min module module_extension multiple_version_override print provider range register_execution_platforms Jul 11, 2024 · Objects, functions and modules registered in the global environment. The value must be in the signed 32-bit range. Dictionaries are iterable; iteration yields the sequence of keys in insertion order. files A struct containing files defined in label or label list type attributes. files)[0] In other words, use file to access the (singular) default output of a dependency. Oct 1, 2025 · This page is the reference manual for the Bazel Query Language used when you use bazel query to analyze build dependencies. These are examples of dependency attributes. ConstraintValueInfo 5 days ago · This page covers the benefits and basic usage of Starlark configurations, Bazel's API for customizing how your project builds. 5 days ago · Here you can ask Bazel to only refetch those external repos where the repository_rule definition has the configure attribute set, use bazel fetch --force --configure. Use the attr module to create an Attribute. It seems that This is a top-level module for defining the attribute schemas of a rule or aspect. Oct 1, 2019 · I don't think this is new breakage. _darwin_constraint[platform_common. 6 This is a top-level module for defining the attribute schemas of a rule or aspect. This makes it possible to: define custom flags for your project, obsoleting the need for --define write transitions to configure deps in different configurations than their parents (such as --compilation Dec 15, 2021 · Description of the feature request: When creating bazel rules, I sometimes want to be able to identify when a rule attribute is provided. For this I want to make a transition take a look at output files of specific targets and based on output change configuration. These objects are used as the values of the attrs dictionary argument of rule() and aspect(). Any attribute that specifies an input label (those defined with attr. Each function returns an object representing the schema of a single attribute. html. label_keyed_string_dict) specifies dependencies of a certain type between a target and the targets whose labels (or the corresponding Label objects) are listed in that attribute when the target is 5 days ago · References a late-bound default value for an attribute of type label. Mar 13, 2022 · Select is only evaluated in rule implementation functions, not macros like you're using. 5 days ago · Creates a schema for an integer attribute. Example usage: Defining a rule attribute: '_foo': attr. Members bool int int_list label label_keyed_string_dict label_list output 5 days ago · attr_aspects is a list of rule attributes along which the aspect propagates. jar files, and pass information, such as locations and names of those artifacts, to the reverse dependencies of those targets in providers. bazel cquery Traditional bazel query runs on the post-loading Dec 18, 2023 · In Bazel, is there a way to access all the providers of a Target without prior knowledge of what provider type a target could contain ? I'd like a rule implementation to simply returns the "re This is a top-level module for defining the attribute schemas of a rule or aspect. Unfrozen dictionaries are mutable, and may be updated by assigning to d[k] or by calling certain methods. 為整數屬性建立結構定義。 值必須位於帶正負號的 32 位元範圍內。 對應的 ctx. It also describes the output formats bazel query supports. Example This is a top-level module for defining the attribute schemas of a rule or aspect. Iteration This is a top-level module for defining the attribute schemas of a rule or aspect. Quickstart To run Bazel, go to your base workspace directory or any of its subdirectories and type bazel. Parameters Stay organized with collections Save and categorize content based on your preferences. bzl files All Bazel files BUILD files MODULE. This argument can only be specified for an attribute of a symbolic macro. For a complete list of functions and types, see the Bazel API reference. label and attr. These objects are used as the values of the attrs dictionary argument of rule () and aspect (). 5 · 7. More complicated typing can be done in the rule’s implementation function. This tutorial will help you get started with Bazel in IntelliJ IDEA. Jun 23, 2022 · Currently I am trying integrate kconfig with bazel. This issue arises because Bazel-generated Python packages for Protocol Buffers These are examples of dependency attributes. A value is 'late-bound' if it requires the configuration to be built before determining the value. Members all analysis_test_transition any archive_override aspect bazel_dep bind bool configuration_field depset dict dir enumerate exec_group fail float getattr git_override hasattr hash int len list local_path_override max min module module_extension multiple_version_override print provider range register_execution_platforms () register_execution_platforms (dev_dependency) register_toolchains The build_setting attribute takes a function that designates the type of the build setting. This attribute is mandatory. These objects are used as the values of the attrs dictionary argument of rule (), aspect (), repository_rule () and tag_class (). This article will provide you with a step-by-step guide to help you get the most out of this tool. The placeholder value depends on the type of attribute. Objects, functions and modules registered in the global environment. Parameters This is a top-level module for defining the attribute schemas of a rule or aspect. Examples for Bazel. The struct values are list of File s. int(configurable=unbound, default=0, doc=None, mandatory=False, values=[]) Creates a schema for an integer attribute. attr. if0ihq ynjip zdmls h1x8wy zhnos vur 2er tp3se eeynzt jnvx