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# Copyright 2016 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
load(":shared.bzl",
"apple_action",
"DARWIN_EXECUTION_REQUIREMENTS",
"APPLE_FRAGMENTS")
def _compute_make_variables(resolved_srcs, files_to_build):
variables = {"SRCS": cmd_helper.join_paths(" ", resolved_srcs),
"OUTS": cmd_helper.join_paths(" ", files_to_build)}
if len(resolved_srcs) == 1:
variables["<"] = list(resolved_srcs)[0].path
if len(files_to_build) == 1:
variables["@"] = list(files_to_build)[0].path
return variables
def _apple_genrule(ctx):
resolved_srcs = set()
if not ctx.outputs.outs:
fail("apple_genrule must have one or more outputs", attr="outs")
files_to_build = set(ctx.outputs.outs)
if ctx.attr.executable and len(files_to_build) > 1:
fail("if genrules produce executables, they are allowed only one output. "
+ "If you need the executable=1 argument, then you should split this "
+ "genrule into genrules producing single outputs",
attr="executable")
label_dict = {}
for dep in ctx.attr.srcs:
resolved_srcs += dep.files
label_dict[dep.label] = dep.files
resolved_inputs, argv, runfiles_manifests = ctx.resolve_command(
command=ctx.attr.cmd,
attribute="cmd",
expand_locations=True,
make_variables=_compute_make_variables(set(resolved_srcs), files_to_build),
tools=ctx.attr.tools,
label_dict=label_dict,
execution_requirements=DARWIN_EXECUTION_REQUIREMENTS)
message = ctx.attr.message or "Executing apple_genrule"
env = ctx.configuration.default_shell_env
env += ctx.fragments.apple.apple_host_system_env()
apple_action(ctx,
inputs=list(resolved_srcs) + resolved_inputs,
outputs=list(files_to_build),
env=env,
command=argv,
progress_message="%s %s" % (message, ctx),
mnemonic="Genrule",
input_manifests=runfiles_manifests)
# Executable has to be specified explicitly
if ctx.attr.executable:
return struct(files=files_to_build,
data_runfiles=ctx.runfiles(transitive_files=files_to_build),
executable=list(files_to_build)[0])
else:
return struct(files=files_to_build,
data_runfiles=ctx.runfiles(transitive_files=files_to_build))
apple_genrule = rule(implementation=_apple_genrule,
attrs={
"srcs": attr.label_list(allow_files=True),
"tools": attr.label_list(cfg=HOST_CFG, allow_files=True),
"outs": attr.output_list(mandatory=True),
"cmd": attr.string(mandatory=True),
"message": attr.string(),
"output_licenses": attr.license(),
"executable": attr.bool(default=False),
},
output_to_genfiles = True,
fragments=APPLE_FRAGMENTS)
"""Genrule which provides Apple specific environment and make variables.
This mirrors the native genrule except that it provides a different set of
make variables. This rule will only run on a Mac.
Example of use:
load("//tools/build_defs/apple/apple_genrule.bzl", "apple_genrule")
apple_genrule(
name = "world",
outs = ["hi"],
cmd = "touch $(@)",
)
This rule also does location expansion, much like the native genrule.
For example, $(location hi) may be used to refer to the output in the
above example.
The set of make variables that are supported for this rule:
OUTS: The outs list. If you have only one output file, you can also use $@.
SRCS: The srcs list (or more precisely, the pathnames of the files
corresponding to labels in the srcs list). If you have only one source
file, you can also use $<.
<: srcs, if it's a single file.
@: outs, if it's a single file.
The following environment variables are added to the rule action:
DEVELOPER_DIR: The base developer directory as defined on Apple architectures,
most commonly used in invoking Apple tools such as xcrun.
"""
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