force_compilation_mode bazel transition rule

t1.bzl

force_compilation_mode = rule(
    # implementation = lambda ctx: 
    #     DefaultInfo( runfiles = ctx.runfiles(
    #         transitive_files = depset( 
    #             transitive = [ depset( transitive = [x[DefaultInfo].files] ) for x in ctx.attr.data ]
    #     ))),
    implementation = lambda ctx: 
        DefaultInfo( files = depset( 
            transitive = [ depset( transitive = [x[DefaultInfo].files] ) for x in ctx.attr.data ]
        )),
    attrs = {
        "compilation_mode": attr.string(mandatory = True),
        "data": attr.label_list(
            mandatory = True,
            cfg = transition(
                implementation = lambda settings, attr: {
                    "//command_line_option:compilation_mode": attr.compilation_mode
                },
                inputs = [],
                outputs = ["//command_line_option:compilation_mode"],
            ),
        ),        
        # This attribute is required to use starlark transitions. It allows
        # allowlisting usage of this rule. For more information, see
        # https://docs.bazel.build/versions/master/skylark/config.html#user-defined-transitions
        "_allowlist_function_transition": attr.label(
            default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
        ),
    }
)

# load("t.bzl", "force_compilation_mode")
#
# cc_binary(
#     name = "a",
#     srcs = ["a.c"],
#     visibility = ["//visibility:public"]
# )
#
# force_compilation_mode(
#     compilation_mode = "dbg",
#     name = "d",
#     data = [":a"]
# )
#
# force_compilation_mode(
#     compilation_mode = "opt",
#     name = "o",
#     data = [":a"]
# )