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hermetic_cc_toolchain/rules/platform.bzl

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# Copyright 2023 Uber Technologies, Inc.
# Licensed under the MIT License
def _platform_transition_impl(settings, attr):
_ignore = settings
return {
"//command_line_option:platforms": "@zig_sdk{}".format(attr.platform),
}
_platform_transition = transition(
implementation = _platform_transition_impl,
inputs = [],
outputs = [
"//command_line_option:platforms",
],
)
def _platform_binary_impl(ctx):
platform_sanitized = ctx.attr.platform.replace("/", "_").replace(":", "_")
dstname = "{}-{}".format(
_paths_basename(ctx.file.src.path),
platform_sanitized,
)
dst = ctx.actions.declare_file(dstname)
src = ctx.file.src
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ctx.actions.run(
outputs = [dst],
inputs = [src],
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executable = "cp",
arguments = [src.path, dst.path],
)
return [DefaultInfo(
files = depset([dst]),
executable = dst,
)]
_attrs = {
"src": attr.label(
allow_single_file = True,
mandatory = True,
doc = "Target to build.",
),
"platform": attr.string(
doc = "The platform to build the target for.",
),
"_allowlist_function_transition": attr.label(
default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
),
}
# wrap a single exectable and build it for the specified platform.
platform_binary = rule(
implementation = _platform_binary_impl,
cfg = _platform_transition,
attrs = _attrs,
executable = True,
)
# wrap a single test target and build it for the specified platform.
platform_test = rule(
implementation = _platform_binary_impl,
cfg = _platform_transition,
attrs = _attrs,
test = True,
)
## Copied from https://github.com/bazelbuild/bazel-skylib/blob/1.4.1/lib/paths.bzl#L22
def _paths_basename(p):
return p.rpartition("/")[-1]