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# Copyright 2018 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(
"//kotlin/internal:utils.bzl",
_utils = "utils",
)
load(
"//kotlin/internal:kt.bzl",
_kt = "kt",
)
"""Kotlin Toolchains
This file contains macros for defining and registering specific toolchains.
### Examples
To override a tool chain use the appropriate macro in a `BUILD` file to declare the toolchain:
```bzl
load("@io_bazel_rules_kotlin//kotlin:toolchains.bzl", "define_kt_toolchain")
define_kt_toolchain(
name= "custom_toolchain",
api_version = "1.1",
language_version = "1.1",
)
```
and then register it in the `WORKSPACE`:
```bzl
register_toolchains("//:custom_toolchain")
```
"""
_KT_COMPILER_REPO="com_github_jetbrains_kotlin"
# The toolchain rules are not made private, at least the jvm ones so that they may be introspected in Intelij.
_common_attrs = {
"kotlin_home": attr.label(
default = Label("@" + _KT_COMPILER_REPO + "//:home"),
allow_files = True,
),
"kotlinbuilder": attr.label(
default = Label("//kotlin/builder"),
executable = True,
allow_files = True,
cfg = "host",
),
"language_version": attr.string(
default = "1.2",
values = [
"1.1",
"1.2",
],
),
"api_version": attr.string(
default = "1.2",
values = [
"1.1",
"1.2",
],
),
"coroutines": attr.string(
default = "enable",
values = [
"enable",
"warn",
"error",
],
),
}
_kt_jvm_attrs = dict(_common_attrs.items() + {
"jvm_runtime": attr.label(
default = Label("@" + _KT_COMPILER_REPO + "//:kotlin-runtime"),
),
"jvm_stdlibs": attr.label_list(
default = [
Label("@" + _KT_COMPILER_REPO + "//:kotlin-stdlib"),
Label("@" + _KT_COMPILER_REPO + "//:kotlin-stdlib-jdk7"),
Label("@" + _KT_COMPILER_REPO + "//:kotlin-stdlib-jdk8"),
]
),
"jvm_target": attr.string(
default = "1.8",
values = [
"1.6",
"1.8",
],
),
}.items())
def _kotlin_toolchain_impl(ctx):
toolchain = platform_common.ToolchainInfo(
label = _utils.restore_label(ctx.label),
language_version = ctx.attr.language_version,
api_version = ctx.attr.api_version,
coroutines = ctx.attr.coroutines,
jvm_target = ctx.attr.jvm_target,
kotlinbuilder = ctx.attr.kotlinbuilder,
kotlin_home = ctx.files.kotlin_home,
jvm_runtime = ctx.files.jvm_runtime,
jvm_stdlibs = ctx.files.jvm_stdlibs
)
return struct(providers=[toolchain])
kt_toolchain = rule(
attrs = _kt_jvm_attrs,
implementation = _kotlin_toolchain_impl,
)
"""The kotlin jvm toolchain
Args:
language_version: the -languag_version flag [see](https://kotlinlang.org/docs/reference/compatibility.html).
api_version: the -api_version flag [see](https://kotlinlang.org/docs/reference/compatibility.html).
jvm_target: the -jvm_target flag.
coroutines: the -Xcoroutines flag, enabled by default as it's considered production ready 1.2.0 onward.
"""
def define_kt_toolchain(name, language_version=None, api_version=None, jvm_target=None, coroutines=None):
"""Define a Kotlin JVM Toolchain, the name is used in the `toolchain` rule so can be used to register the toolchain in the WORKSPACE file."""
impl_name = name + "_impl"
kt_toolchain(
name = impl_name,
language_version = language_version,
api_version = api_version,
jvm_target = jvm_target,
coroutines = coroutines,
visibility = ["//visibility:public"]
)
native.toolchain(
name = name,
toolchain_type = _kt.defs.TOOLCHAIN_TYPE,
toolchain = impl_name,
visibility = ["//visibility:public"]
)