support build efsw in bazel toolchain

.bazelrc

@@ -0,0 +1,158 @@
+# NOTE(lingxuan.zlx): this bazelrc is partial copy for ray project and remove some unrelated.
+# Must be first. Enables build:windows, build:linux, build:macos, build:freebsd, build:openbsd
+build --enable_platform_specific_config
+###############################################################################
+# On       Windows, provide: BAZEL_SH, and BAZEL_LLVM (if using clang-cl)
+# On all platforms, provide: PYTHON3_BIN_PATH=python
+###############################################################################
+build --action_env=PATH
+# For --compilation_mode=dbg, consider enabling checks in the standard library as well (below).
+build --compilation_mode=opt
+build --cxxopt="-D_GLIBCXX_USE_CXX11_ABI=0"
+# Using C++ 17 on all platforms.
+build:linux --cxxopt="-std=c++17"
+build:macos --cxxopt="-std=c++17"
+build:clang-cl --cxxopt="-std=c++17"
+build:msvc-cl --cxxopt="/std:c++17"
+build:windows --cxxopt="/std:c++17"
+build:linux --force_pic
+build:macos --force_pic
+build:clang-cl --compiler=clang-cl
+build:msvc-cl --compiler=msvc-cl
+build --action_env=LC_ALL
+build --action_env=LANG
+# This is needed for some core tests to run correctly
+build:windows --enable_runfiles
+# Warnings should be errors
+build:linux    --per_file_copt="-\\.(asm|S)$@-Werror"
+build:macos    --per_file_copt="-\\.(asm|S)$@-Werror"
+build:clang-cl --per_file_copt="-\\.(asm|S)$@-Werror"
+build:msvc-cl     --per_file_copt="-\\.(asm|S)$@-WX"
+# Ignore warnings for protobuf generated files and external projects.
+build --per_file_copt="\\.pb\\.cc$@-w"
+build --per_file_copt="-\\.(asm|S)$,external/.*@-w"
+#build --per_file_copt="external/.*@-Wno-unused-result"
+# Ignore minor warnings for host tools, which we generally can't control
+build:clang-cl --host_copt="-Wno-inconsistent-missing-override"
+build:clang-cl --host_copt="-Wno-microsoft-unqualified-friend"
+
+# Print relative paths when possible
+build:windows --attempt_to_print_relative_paths
+# Save disk space by hardlinking cache hits instead of copying
+build:windows --experimental_repository_cache_hardlinks
+# Clean the environment before building, to make builds more deterministic
+build:windows --incompatible_strict_action_env
+# For colored output (seems necessary on Windows)
+build:windows --color=yes
+# For compiler colored output (seems necessary on Windows)
+build:clang-cl --per_file_copt="-\\.(asm|S)$@-fansi-escape-codes"
+build:clang-cl --per_file_copt="-\\.(asm|S)$@-fcolor-diagnostics"
+
+# LLVM (clang & libc++) build flags common across Linux installations and systems.
+# On Ubuntu, the remaining configurations can be generated by running ci/travis/install-llvm-binaries.sh
+build:llvm --action_env=CXXFLAGS=-stdlib=libc++
+build:llvm --action_env=LDFLAGS=-stdlib=libc++
+build:llvm --action_env=BAZEL_CXXOPTS=-stdlib=libc++
+build:llvm --action_env=BAZEL_LINKLIBS=-l%:libc++.a:-l%:libc++abi.a
+build:llvm --action_env=BAZEL_LINKOPTS=-lm:-pthread
+build:llvm --define force_libcpp=enabled
+
+# Thread sanitizer configuration:
+build:tsan --strip=never
+build:tsan --copt -fsanitize=thread
+build:tsan --copt -DTHREAD_SANITIZER
+build:tsan --copt -O2
+build:tsan --copt -g
+build:tsan --copt -fno-omit-frame-pointer
+build:tsan --copt -Wno-uninitialized
+build:tsan --linkopt -fsanitize=thread
+# This config is only for running TSAN with LLVM toolchain on Linux.
+build:tsan-clang --config=tsan
+build:tsan-clang --config=llvm
+test:tsan --test_env=TSAN_OPTIONS="report_atomic_races=0"
+
+# Memory sanitizer configuration
+build:asan --strip=never
+build:asan --copt -g
+build:asan --copt -fsanitize=address
+build:asan --copt -DADDRESS_SANITIZER
+build:asan --copt -fno-omit-frame-pointer
+build:asan --linkopt -fsanitize=address
+test:asan --jobs=1
+test:asan --test_env=ASAN_OPTIONS="detect_leaks=0"
+# This config is only for running ASAN with LLVM toolchain on Linux.
+# https://github.com/google/sanitizers/issues/1017
+build:asan-clang --config=asan
+build:asan-clang --config=llvm
+build:asan-clang --copt -mllvm
+build:asan-clang --copt -asan-use-private-alias=1
+
+build:asan-build --strip=never
+build:asan-build -c dbg
+build:asan-build --copt -fsanitize=address
+build:asan-build --copt -DADDRESS_SANITIZER
+build:asan-build --copt -O1
+build:asan-build --copt -g
+build:asan-build --copt -fno-omit-frame-pointer
+build:asan-build --copt -static-libasan
+build:asan-build --linkopt -fsanitize=address
+build:asan-build --linkopt -static-libasan
+# For example, for Ubuntu 18.04 libasan can be found here:
+# test:asan --test_env=LD_PRELOAD="/usr/lib/gcc/x86_64-linux-gnu/7/libasan.so"
+test:asan-buildkite --test_env=LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libasan.so.5"
+
+# CI configuration:
+aquery:ci --color=no
+aquery:ci --noshow_progress
+build:ci --color=yes
+build:ci --curses=no
+build:ci --keep_going
+build:ci --progress_report_interval=100
+build:ci --show_progress_rate_limit=15
+build:ci --show_task_finish
+build:ci --ui_actions_shown=1024
+build:ci --show_timestamps
+test:ci --flaky_test_attempts=3
+# Disable test result caching because py_test under Bazel can import from outside of sandbox, but Bazel only looks at
+# declared dependencies to determine if a result should be cached. More details at:
+# https://github.com/bazelbuild/bazel/issues/7091, https://github.com/bazelbuild/rules_python/issues/382
+test:ci --nocache_test_results
+test:ci --spawn_strategy=local
+test:ci --test_output=errors
+test:ci --test_verbose_timeout_warnings
+test:ci-debug -c dbg
+test:ci-debug --copt="-g"
+test:ci-debug --flaky_test_attempts=3
+# Disable test result caching for the same reason above.
+test:ci-debug --nocache_test_results
+test:ci-debug --spawn_strategy=local
+test:ci-debug --test_output=errors
+test:ci-debug --test_verbose_timeout_warnings
+
+aquery:get-toolchain --include_commandline=false
+aquery:get-toolchain --noimplicit_deps
+
+# [Linux] Uncomment this line (or use --config) to print a stack trace on exit.
+#test:linux --config=strace
+test:strace --run_under="bash -c 'if command -v strace >/dev/null && strace -qq -k -e exit true 2>/dev/null; then strace -qq -k -e exit -e trace=\"!all\" -s 32768 -f -o >(awk \"/^[0-9]+ / { y = \\$3 != \\\"SIGCHLD\\\" && \\$3 != \\\"SIGTERM\\\" && \\$5 != \\\"SIGTERM\\\" && \\$5 != \\\"SIGKILL2\\\"; } y { print; }\" 1>&2 && cat 1>&2) -- \"$@\"; else \"$@\"; fi' -"
+# [Linux] Uncomment this line (or use --config) to preload libSegFault.so if available, to print a stack trace on aborts and segfault. (Note: This doesn't always work.)
+#test:linux --config=segfault
+test:segfault --run_under="bash -c 'unset GREP_OPTIONS && if ! grep -q -o Microsoft /proc/version 2>/dev/null; then libs=\"$(command -v ldconfig >/dev/null && ldconfig -p | grep -F -o -e \"libSegFault.so\" | uniq | tr \"\\\\n\" :)\" && if [ -n \"${libs%:}\" ]; then export SEGFAULT_SIGNALS=\"abrt segv\" LD_PRELOAD=\"${libs}${LD_PRELOAD-}\"; fi; fi && \"$@\"' -"
+
+# Debug build:
+build:debug -c dbg
+build:debug --copt="-g"
+build:debug --strip="never"
+
+# Undefined Behavior Sanitizer
+build:ubsan --strip=never
+build:ubsan --copt -fsanitize=undefined
+build:ubsan --copt -fno-sanitize=vptr
+build:ubsan --copt -fno-sanitize-recover=all
+build:ubsan --copt -g
+build:ubsan --linkopt -fsanitize=undefined
+build:ubsan --linkopt -fno-sanitize-recover=all
+
+# Import local specific llvm config options, which can be generated by
+# ci/travis/install-llvm-dependencies.sh
+try-import %workspace%/.llvm-local.bazelrc

BUILD.bazel

@@ -0,0 +1,112 @@
+# Bazel build
+# C/C++ documentation: https://docs.bazel.build/versions/master/be/c-cpp.html
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+config_setting(
+    name = "msvc-cl",
+    flag_values = {"@bazel_tools//tools/cpp:compiler": "msvc-cl"},
+)
+
+config_setting(
+    name = "clang-cl",
+    flag_values = {"@bazel_tools//tools/cpp:compiler": "clang-cl"},
+)
+
+config_setting(
+    name = "opt",
+    values = {"compilation_mode": "opt"},
+)
+
+cc_library(
+    name = "efsw",
+    srcs = [
+               "src/efsw/Debug.cpp",
+               "src/efsw/DirectorySnapshot.cpp",
+               "src/efsw/DirectorySnapshotDiff.cpp",
+               "src/efsw/DirWatcherGeneric.cpp",
+               "src/efsw/FileInfo.cpp",
+               "src/efsw/FileSystem.cpp",
+               "src/efsw/FileWatcher.cpp",
+               "src/efsw/FileWatcherCWrapper.cpp",
+               "src/efsw/FileWatcherGeneric.cpp",
+               "src/efsw/FileWatcherImpl.cpp",
+               "src/efsw/Log.cpp",
+               "src/efsw/Mutex.cpp",
+               "src/efsw/String.cpp",
+               "src/efsw/System.cpp",
+               "src/efsw/Thread.cpp",
+               "src/efsw/Watcher.cpp",
+               "src/efsw/WatcherGeneric.cpp",
+               "src/efsw/platform/platformimpl.hpp",
+               "src/efsw/Utf.inl",
+           ] + select({
+               "@bazel_tools//src/conditions:windows": glob([
+                   "src/efsw/platform/win/*.cpp",
+               ]) + [
+                   "src/efsw/FileWatcherWin32.cpp",
+                   "src/efsw/WatcherWin32.cpp",
+               ],
+               "//conditions:default": glob([
+                   "src/efsw/platform/posix/*.cpp",
+               ]),
+           }) +
+           select({
+               "@bazel_tools//src/conditions:darwin": [
+                   "src/efsw/FileWatcherFSEvents.cpp",
+                   "src/efsw/FileWatcherKqueue.cpp",
+                   "src/efsw/WatcherFSEvents.cpp",
+                   "src/efsw/WatcherKqueue.cpp",
+               ],
+               "@bazel_tools//src/conditions:linux_x86_64": [
+                   "src/efsw/FileWatcherInotify.cpp",
+                   "src/efsw/WatcherInotify.cpp",
+               ],
+               "//conditions:default": [],
+           }),
+    hdrs = glob([
+        "src/efsw/*.h",
+        "src/efsw/platform/*.hpp",
+        "src/efsw/platform/posix/*.hpp",
+        "src/efsw/platform/win/*.hpp",
+        "src/efsw/*.hpp",
+    ]),
+    linkopts = [
+        "-lpthread",
+    ],
+    includes = [
+        "src/efsw",
+    ],
+    linkstatic = True,
+    strip_include_prefix = "src",
+    deps = [
+        ":efsw_header",
+    ],
+)
+
+cc_library(
+    name = "efsw_header",
+    srcs = [
+        "include/efsw/efsw.h",
+        "include/efsw/efsw.hpp",
+    ],
+    hdrs = glob([
+        "include/*.h",
+        "include/*.hpp",
+    ]),
+    includes = [
+        "include",
+    ],
+    linkstatic = True,
+    strip_include_prefix = "include",
+)
+
+cc_test(
+    name = "efsw_test",
+    srcs = ["src/test/efsw-test.cpp",
+    ],
+    deps = [
+        ":efsw",
+    ],
+)

WORKSPACE

@@ -0,0 +1,5 @@
+workspace(name = "com_github_efsw")
+
+# LOAD  WORKSPACE
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
+# When the bazel version is updated, make sure to update it