common bazel cxx toolchain for Linux and Mac

.gitignore

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+**/.DS_Store
+**/*.pyc
+bazel-*

.travis.yml

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+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      sudo: required
+      language: java
+    - os: osx
+      osx_image: xcode8.3
+      language: java
+
+env:
+  global:
+    - BAZEL_VERSION=0.5.2
+
+before_install:
+  - echo $TRAVIS_OS_NAME;
+  - unset CC
+  - unset CXX
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get autoremove openjdk-9-jre-headless openjdk-9-jdk oracle-java9-installer; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get purge openjdk-9-jre-headless openjdk-9-jdk oracle-java9-installer; fi
+  - mkdir -p ${HOME}/bazel/install
+  - pushd ${HOME}/bazel/install
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then wget --no-clobber https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/bazel_${BAZEL_VERSION}-linux-x86_64.deb; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo dpkg -i bazel_${BAZEL_VERSION}-linux-x86_64.deb; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install bazel; fi
+  - popd
+
+script:
+  - bazel test --crosstool_top=//tools/cpp:default-toolchain //src/...
+
+notifications:
+  email: false
+  slack: false

README.md

@@ -1 +1,15 @@
-# bazel-toolchains
+# Bazel Toolchains
+
+A collection of [Bazel](https://bazel.build) C++ build infrastructure based on [Chromium](https://chromium.org)'s [LLVM](https://llvm.org) toolchain. There are tags corresponding to stable Chromium releases. The build targets currently supported are Linux x64 and macOS. As in Chromium, the Linux toolchain has a sysroot, bundled copies of binutils, and a copy of libc++. The macOS build is less hermetic, and relies on system binutils and libraries.
+
+## Prerequisites
+
+On macOS, run `xcode-select --install` in Terminal.
+
+## Running the Python scripts
+
+The files in the `scripts/` directory are written in Python. Follow these [instructions](http://docs.python-guide.org/en/latest/starting/installation/) to install a version of Python that comes with the necessary tools for installation of third party libraries. On macOS, this means `brew install python`, and then following the instructions printed by `brew info python`.
+
+Once that's working, type `pip install requests` to install the necessary dependencies.
+
+From the root of this repository, type `python scripts/generate_workspace.py --rev="61.0.3153.4"` where --rev is the Chromium tag you wish to pull from. The script will print status messages to `stderr` and write a file similar to toolchains/repositories.bzl to `stdout`.

WORKSPACE

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+# Chromium toolchain corresponding to Chromium 61.0.3153.4
+
+load("//toolchains:repositories.bzl", "bazel_toolchains_repositories")
+bazel_toolchains_repositories()
+
+# GTest
+new_http_archive(
+  name = "gtest",
+  url = "https://github.com/google/googletest/archive/release-1.8.0.zip",
+  sha256 = "f3ed3b58511efd272eb074a3a6d6fb79d7c2e6a0e374323d1e6bcbcc1ef141bf",
+  build_file = "build_files/gtest.BUILD",
+  strip_prefix = "googletest-release-1.8.0/googletest",
+)

build_files/BUILD

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+filegroup(
+    name = "build_files",
+    srcs = glob(["*.BUILD"]),
+    visibility = ["//visibility:public"],
+)

build_files/gtest.BUILD

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+cc_library(
+    name = "main",
+    srcs = glob(
+        ["src/*.cc"],
+        exclude = ["src/gtest-all.cc"]
+    ),
+    hdrs = glob([
+        "include/**/*.h",
+        "src/*.h"
+    ]),
+    copts = [
+      '-Iexternal/gtest/include',
+      '-Wno-unused-const-variable',
+    ],
+    linkopts = ["-v"],
+    visibility = ["//visibility:public"],
+)

build_files/org_chromium_binutils_linux_x64.BUILD

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+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+  name = "ar",
+  srcs = [
+    "bin/ar",
+  ],
+)
+
+filegroup(
+  name = "as",
+  srcs = [
+    "bin/as",
+  ],
+)
+
+filegroup(
+  name = "ld",
+  srcs = [
+    "bin/ld",
+  ],
+)
+
+filegroup(
+  name = "ld.bfd",
+  srcs = [
+    "bin/ld.bfd",
+  ],
+)
+
+filegroup(
+  name = "ld.gold",
+  srcs = [
+    "bin/ld.gold",
+  ],
+)
+
+filegroup(
+  name = "nm",
+  srcs = [
+    "bin/nm",
+  ],
+)
+
+filegroup(
+  name = "objcopy",
+  srcs = [
+    "bin/objcopy",
+  ],
+)
+
+filegroup(
+  name = "objdump",
+  srcs = [
+    "bin/objdump",
+  ],
+)
+
+filegroup(
+  name = "ranlib",
+  srcs = [
+    "bin/ranlib",
+  ],
+)
+
+filegroup(
+  name = "readelf",
+  srcs = [
+    "bin/readelf",
+  ],
+)
+
+filegroup(
+  name = "strip",
+  srcs = [
+    "bin/strip",
+  ],
+)
+
+filegroup(
+  name = "binutils_components",
+  srcs = [
+    ":ar",
+    ":as",
+    ":ld",
+    ":ld.bfd",
+    ":ld.gold",
+    ":nm",
+    ":objcopy",
+    ":objdump",
+    ":ranlib",
+    ":readelf",
+    ":strip",
+  ],
+)

build_files/org_chromium_clang_linux_x64.BUILD

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+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+  name = "clang",
+  srcs = [
+    "bin/clang",
+  ],
+)
+
+filegroup(
+  name = "lib",
+  srcs = glob(["lib/**"]),
+)
+
+filegroup(
+  name = "compiler_components",
+  srcs = [
+    ":clang",
+    ":lib",
+  ],
+)

build_files/org_chromium_clang_mac.BUILD

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+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+  name = "clang",
+  srcs = [
+    "bin/clang",
+  ],
+)
+
+filegroup(
+  name = "include",
+  srcs = glob(["include/**"]),
+)
+
+filegroup(
+  name = "lib",
+  srcs = glob(["lib/**"]),
+)
+
+filegroup(
+  name = "compiler_components",
+  srcs = [
+    ":clang",
+    ":include",
+    ":lib",
+  ],
+)

build_files/org_chromium_libcxx.BUILD

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+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+  name = "libcxx_includes",
+  srcs = glob(["include/**/*"])
+)
+
+cc_library(
+  name = "cxxlib",
+  copts = [
+    "-fPIC",
+    "-fstrict-aliasing",
+    "-nostdinc++",
+    "-std=c++11",
+  ],
+  hdrs = glob(["src/support/runtime/*.ipp"]),
+  includes = ["include"],
+  defines = [
+    "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS",
+    "_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS",
+    "_LIBCPP_BUILDING_LIBRARY",
+    "LIBCXX_BUILDING_LIBCXXABI"
+
+    # This resets the visibility to default only for the various
+    # flavors of operator new and operator delete.  These symbols
+    # are weak and get overriden by Chromium-provided ones, but if
+    # these symbols had hidden visibility, this would make the
+    # Chromium symbols hidden too because elf visibility rules
+    # require that linkers use the least visible form when merging,
+    # and if this is hidden, then when we merge it with tcmalloc's
+    # operator new, hidden visibility would win. However, tcmalloc
+    # needs a visible operator new to also override operator new
+    # references from system libraries.
+    # TODO(lld): Ask lld for a --force-public-visibility flag or
+    # similar to that overrides the default elf merging rules, and
+    # make tcmalloc's gn config pass that to all its dependencies,
+    # then remove this override here.
+    #"_LIBCPP_OVERRIDABLE_FUNC_VIS=__attribute__((__visibility__(\"\"default\"\"")))",
+  ],
+  srcs = [
+    "src/algorithm.cpp",
+    "src/any.cpp",
+    "src/bind.cpp",
+    "src/chrono.cpp",
+    "src/condition_variable.cpp",
+    "src/debug.cpp",
+    "src/exception.cpp",
+    "src/functional.cpp",
+    "src/future.cpp",
+    "src/hash.cpp",
+    "src/ios.cpp",
+    "src/iostream.cpp",
+    "src/locale.cpp",
+    "src/memory.cpp",
+    "src/mutex.cpp",
+    "src/new.cpp",
+    "src/optional.cpp",
+    "src/random.cpp",
+    "src/regex.cpp",
+    "src/shared_mutex.cpp",
+    "src/stdexcept.cpp",
+    "src/string.cpp",
+    "src/strstream.cpp",
+    "src/system_error.cpp",
+    "src/thread.cpp",
+    "src/typeinfo.cpp",
+    "src/utility.cpp",
+    "src/valarray.cpp",
+    "src/variant.cpp",
+    "src/include/atomic_support.h",
+    "src/include/config_elast.h",
+  ],
+  deps = [
+    "@org_chromium_libcxxabi//:include",
+  ]
+)
+
+cc_library(
+  name = "cxx",
+  hdrs = [
+    "libcxx_includes",
+    "@org_chromium_libcxxabi//:include",
+  ],
+  deps = [
+    "@org_chromium_libcxxabi//:cxxabi",
+    ":cxxlib"
+  ],
+)