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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.
"""Rules for configuring the C++ toolchain (experimental)."""
load("@bazel_tools//tools/cpp:windows_cc_configure.bzl", "configure_windows_toolchain")
load("@bazel_tools//tools/cpp:osx_cc_configure.bzl", "configure_osx_toolchain")
load("@bazel_tools//tools/cpp:unix_cc_configure.bzl", "configure_unix_toolchain")
load(
"@bazel_tools//tools/cpp:lib_cc_configure.bzl",
"get_cpu_value",
"resolve_labels",
)
load("@bazel_tools//tools/osx:xcode_configure.bzl", "run_xcode_locator")
def _generate_cpp_only_build_file(repository_ctx, cpu_value, paths):
repository_ctx.template(
"BUILD",
paths["@bazel_tools//tools/cpp:BUILD.toolchains.tpl"],
{"%{name}": cpu_value},
)
def cc_autoconf_toolchains_impl(repository_ctx):
"""Generate BUILD file with 'toolchain' targets for the local host C++ toolchain.
Args:
repository_ctx: repository context
"""
paths = resolve_labels(repository_ctx, [
"@bazel_tools//tools/cpp:BUILD.toolchains.tpl",
"@bazel_tools//tools/osx/crosstool:BUILD.toolchains",
"@bazel_tools//tools/osx/crosstool:osx_archs.bzl",
"@bazel_tools//tools/osx:xcode_locator.m",
])
env = repository_ctx.os.environ
cpu_value = get_cpu_value(repository_ctx)
# Should we try to find C++ toolchain at all? If not, we don't have to generate toolchains for C++ at all.
should_detect_cpp_toolchain = "BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN" not in env or env["BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN"] != "1"
# Should we unconditionally *not* use xcode? If so, we don't have to run Xcode locator ever.
should_use_cpp_only_toolchain = "BAZEL_USE_CPP_ONLY_TOOLCHAIN" in env and env["BAZEL_USE_CPP_ONLY_TOOLCHAIN"] == "1"
# Should we unconditionally use xcode? If so, we don't have to run Xcode locator now.
should_use_xcode = "BAZEL_USE_XCODE_TOOLCHAIN" in env and env["BAZEL_USE_XCODE_TOOLCHAIN"] == "1"
if not should_detect_cpp_toolchain:
repository_ctx.file("BUILD", "# C++ toolchain autoconfiguration was disabled by BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN env variable.")
elif cpu_value.startswith("darwin") and not should_use_cpp_only_toolchain:
xcode_toolchains = []
# Only detect xcode if the user didn't tell us it will be there.
if not should_use_xcode:
# TODO(#6926): Unify C++ and ObjC toolchains so we don't have to run xcode locator to generate toolchain targets.
# And also so we don't have to keep this code in sync with //tools/cpp:osx_cc_configure.bzl.
(xcode_toolchains, _xcodeloc_err) = run_xcode_locator(
repository_ctx,
paths["@bazel_tools//tools/osx:xcode_locator.m"],
)
if should_use_xcode or xcode_toolchains:
repository_ctx.symlink(paths["@bazel_tools//tools/osx/crosstool:BUILD.toolchains"], "BUILD")
repository_ctx.symlink(paths["@bazel_tools//tools/osx/crosstool:osx_archs.bzl"], "osx_archs.bzl")
else:
_generate_cpp_only_build_file(repository_ctx, cpu_value, paths)
else:
_generate_cpp_only_build_file(repository_ctx, cpu_value, paths)
cc_autoconf_toolchains = repository_rule(
environ = [
"BAZEL_USE_CPP_ONLY_TOOLCHAIN",
"BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN",
],
implementation = cc_autoconf_toolchains_impl,
configure = True,
)
def cc_autoconf_impl(repository_ctx, overriden_tools = dict()):
"""Generate BUILD file with 'cc_toolchain' targets for the local host C++ toolchain.
Args:
repository_ctx: repository context
overriden_tools: dict of tool paths to use instead of autoconfigured tools
"""
env = repository_ctx.os.environ
cpu_value = get_cpu_value(repository_ctx)
if "BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN" in env and env["BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN"] == "1":
paths = resolve_labels(repository_ctx, [
"@bazel_tools//tools/cpp:BUILD.empty.tpl",
"@bazel_tools//tools/cpp:empty_cc_toolchain_config.bzl",
])
repository_ctx.symlink(paths["@bazel_tools//tools/cpp:empty_cc_toolchain_config.bzl"], "cc_toolchain_config.bzl")
repository_ctx.template("BUILD", paths["@bazel_tools//tools/cpp:BUILD.empty.tpl"], {
"%{cpu}": get_cpu_value(repository_ctx),
})
elif cpu_value == "freebsd" or cpu_value == "openbsd":
paths = resolve_labels(repository_ctx, [
"@bazel_tools//tools/cpp:BUILD.static.bsd",
"@bazel_tools//tools/cpp:bsd_cc_toolchain_config.bzl",
])
# This is defaulting to a static crosstool. We should eventually
# autoconfigure this platform too. Theorically, FreeBSD and OpenBSD
# should be straightforward to add but we cannot run them in a Docker
# container so skipping until we have proper tests for these platforms.
repository_ctx.symlink(paths["@bazel_tools//tools/cpp:bsd_cc_toolchain_config.bzl"], "cc_toolchain_config.bzl")
repository_ctx.symlink(paths["@bazel_tools//tools/cpp:BUILD.static.bsd"], "BUILD")
elif cpu_value == "x64_windows":
# TODO(ibiryukov): overriden_tools are only supported in configure_unix_toolchain.
# We might want to add that to Windows too(at least for msys toolchain).
configure_windows_toolchain(repository_ctx)
elif (cpu_value.startswith("darwin") and
("BAZEL_USE_CPP_ONLY_TOOLCHAIN" not in env or env["BAZEL_USE_CPP_ONLY_TOOLCHAIN"] != "1")):
configure_osx_toolchain(repository_ctx, cpu_value, overriden_tools)
else:
configure_unix_toolchain(repository_ctx, cpu_value, overriden_tools)
MSVC_ENVVARS = [
"BAZEL_VC",
"BAZEL_VC_FULL_VERSION",
"BAZEL_VS",
"BAZEL_WINSDK_FULL_VERSION",
"VS90COMNTOOLS",
"VS100COMNTOOLS",
"VS110COMNTOOLS",
"VS120COMNTOOLS",
"VS140COMNTOOLS",
"VS150COMNTOOLS",
"VS160COMNTOOLS",
"TMP",
"TEMP",
]
cc_autoconf = repository_rule(
environ = [
"ABI_LIBC_VERSION",
"ABI_VERSION",
"BAZEL_COMPILER",
"BAZEL_HOST_SYSTEM",
"BAZEL_CXXOPTS",
"BAZEL_LINKOPTS",
"BAZEL_LINKLIBS",
"BAZEL_LLVM_COV",
"BAZEL_PYTHON",
"BAZEL_SH",
"BAZEL_TARGET_CPU",
"BAZEL_TARGET_LIBC",
"BAZEL_TARGET_SYSTEM",
"BAZEL_USE_CPP_ONLY_TOOLCHAIN",
"BAZEL_USE_XCODE_TOOLCHAIN",
"BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN",
"BAZEL_USE_LLVM_NATIVE_COVERAGE",
"BAZEL_LLVM",
"BAZEL_IGNORE_SYSTEM_HEADERS_VERSIONS",
"USE_CLANG_CL",
"CC",
"CC_CONFIGURE_DEBUG",
"CC_TOOLCHAIN_NAME",
"CPLUS_INCLUDE_PATH",
"DEVELOPER_DIR",
"GCOV",
"HOMEBREW_RUBY_PATH",
"SYSTEMROOT",
"USER",
] + MSVC_ENVVARS,
implementation = cc_autoconf_impl,
configure = True,
)
def cc_configure():
"""A C++ configuration rules that generate the crosstool file."""
cc_autoconf_toolchains(name = "local_config_cc_toolchains")
cc_autoconf(name = "local_config_cc")
native.bind(name = "cc_toolchain", actual = "@local_config_cc//:toolchain")
native.register_toolchains(
# Use register_toolchain's target pattern expansion to register all toolchains in the package.
"@local_config_cc_toolchains//:all",
)
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