| # 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 in ["x64_windows", "arm64_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", |
| ) |
