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Some manufacturers, to cut down on support calls, make it hard or impossible to uninstall the pre-bundled software via the conventional routes. This prevents calls of "I deleted Microsoft Word, how do I get it back"? Indicates that this feature is one of several mutually exclusive alternate features.
This improves error handling by listing the alternatives if the user asks for two or more mutually exclusive features at once. Actions provide the flexibility to modify the circumstances under which an action executes without assuming how the action will be run. Features reference actions to signal which Bazel actions they affect since actions can modify the Bazel action graph. Flags are assigned to each action by associating them with a feature. Each action name represents a single type of action performed by Bazel, such as compiling or linking.
There is, however, a many-to-one relationship between actions and Bazel action types, where a Bazel action type refers to a Java class that implements an action such as CppCompileAction. AR actions assemble object files into archive libraries. This behavior is similar to that of a feature. The tool constructor takes in the following parameters:. You should end your tool lists with a default tool that corresponds to an empty feature configuration.
Features and actions can be used together to implement Bazel actions with diverse cross-platform semantics. For example, debug symbol generation on macOS requires generating symbols in the compile action, then invoking a specialized tool during the link action to create compressed dsym archive, and then decompressing that archive to produce the application bundle and. With Bazel, this process can instead be implemented as follows, with unbundle-debuginfo being a Bazel action:.
This same feature can be implemented entirely differently for Linux, which uses fission , or for Windows, which produces. For example, the implementation for fission -based debug symbol generation might look as follows:.
CcToolchainConfigInfo allows you to bundle flags into groups that serve a specific purpose. You can specify a flag within using pre-defined variables within the flag value, which the compiler expands when adding the flag to the build command.
For example:. Flag groups are expanded to the build command in the order in which they appear in the list, top-to-bottom, left-to-right. For flags that need to repeat with different values when added to the build command, the flag group can iterate variables of type list. Structures can be nested and may also contain sequences. To prevent name clashes and to be explicit, you must specify the full path through the fields.
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