"""Alias that transitions its target to `compilation_mode=opt`. Use `transition_alias="opt"` to enable."""

load("@rules_cc//cc:defs.bzl", "CcInfo")

load("@rules_rust//rust:rust_common.bzl", "COMMON_PROVIDERS")

def _transition_alias_impl(ctx):

# `ctx.attr.actual` is a list of 1 item due to the transition

providers = [ctx.attr.actual[0][provider] for provider in COMMON_PROVIDERS]

if CcInfo in ctx.attr.actual[0]:

providers.append(ctx.attr.actual[0][CcInfo])

return providers

def _change_compilation_mode(compilation_mode):

def _change_compilation_mode_impl(_settings, _attr):

return {

"//command_line_option:compilation_mode": compilation_mode,

}

return transition(

implementation = _change_compilation_mode_impl,

inputs = [],

outputs = [

"//command_line_option:compilation_mode",

],

)

def _transition_alias_rule(compilation_mode):

return rule(

implementation = _transition_alias_impl,

provides = COMMON_PROVIDERS,

attrs = {

"actual": attr.label(

mandatory = True,

doc = "`rust_library()` target to transition to `compilation_mode=opt`.",

providers = COMMON_PROVIDERS,

cfg = _change_compilation_mode(compilation_mode),

),

"_allowlist_function_transition": attr.label(

default = "@bazel_tools//tools/allowlists/function_transition_allowlist",

),

},

doc = "Transitions a Rust library crate to the `compilation_mode=opt`.",

)

transition_alias_dbg = _transition_alias_rule("dbg")

transition_alias_fastbuild = _transition_alias_rule("fastbuild")

transition_alias_opt = _transition_alias_rule("opt")