mirror of https://github.com/bazelbuild/platforms
86 lines
2.3 KiB
Python
86 lines
2.3 KiB
Python
"""
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The platform_data rule can be used to change the target platform of a target,
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and then depend on that elsewhere in the build tree. For example:
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load("@platforms//experimental/platform_data:defs.bzl", "platform_data")
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cc_binary(name = "foo")
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platform_data(
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name = "foo_embedded",
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target = ":foo",
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platform = "//my/new:platform",
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)
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py_binary(
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name = "flasher",
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srcs = ...,
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data = [
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":foo_embedded",
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],
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)
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Regardless of what platform the top-level :flasher binary is built for,
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the :foo_embedded target will be built for //my/new:platform.
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Note that if you depend on :foo_embedded it's not exactly the same as depending on :foo, since it won't forward all the same providers. In the future, we can extend this to add some common providers as needed."""
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def _target_platform_transition_impl(attr):
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return {
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"//command_line_option:platforms": str(attr.platform),
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}
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_target_platform_transition = transition(
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implementation = _target_platform_transition_impl,
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inputs = [],
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outputs = [
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"//command_line_option:platforms",
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],
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)
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def _platform_data_impl(ctx):
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target = ctx.attr.target
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default_info = target[DefaultInfo]
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files = default_info.files
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original_executable = default_info.files_to_run.executable
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runfiles = default_info.default_runfiles
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new_executable = ctx.actions.declare_file(ctx.attr.name)
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ctx.actions.symlink(
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output = new_executable,
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target_file = original_executable,
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is_executable = True,
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)
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files = depset(direct = [new_executable], transitive = [files])
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runfiles = runfiles.merge(ctx.runfiles([new_executable]))
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return [
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DefaultInfo(
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files = files,
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runfiles = runfiles,
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executable = new_executable,
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)
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]
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platform_data = rule(
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implementation = _platform_data_impl,
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attrs = {
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"target": attr.label(
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allow_files = False,
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executable = True,
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mandatory = True,
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cfg = _target_platform_transition,
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),
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"platform": attr.label(
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mandatory = True,
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),
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"_allowlist_function_transition": attr.label(
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default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
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),
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},
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executable = True,
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)
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