Export of internal Abseil changes.

--
78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer <asoffer@google.com>:

internal changes

PiperOrigin-RevId: 247073879

--
7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro <dmauro@google.com>:

Release commandline flags

PiperOrigin-RevId: 247065920

--
2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck <shreck@google.com>:

Add documentation for built-in usage flags

PiperOrigin-RevId: 247058863

--
14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 247058292

--
ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team <absl-team@google.com>:

Internal Change.

PiperOrigin-RevId: 246828655

--
e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 246822325

--
907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier <ericwf@google.com>:

Accept vector<bool>::reference in StrCat and friends.

Converting vector<bool>::reference to alphanum requires
two user defined conversions, which isn't allowed.
In order to accept this, we need a special constructor that
is only enabled for the bool proxy types.

PiperOrigin-RevId: 246626732

--
fe4295fa95cc65dee8c881ba12dd8f516e68c40d by Abseil Team <absl-team@google.com>:

Clarify the proper way to define AbslHashValue, and fix confusing indentation.

PiperOrigin-RevId: 246406528

--
d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental <rogeeff@google.com>:

Internal change

PiperOrigin-RevId: 246358214

--
a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team <absl-team@google.com>:

Fix sample template instantiation.

PiperOrigin-RevId: 246354617

--
29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team <absl-team@google.com>:

Fix incorrectly copy-pasted static_assert in absl::optional::value_or

The static_assert for a move-constructible type previously said the type must be copy-constructible.

PiperOrigin-RevId: 246313827

--
41884d5872d4ea2c67875b00144b8c8a5859a295 by Greg Falcon <gfalcon@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 245418790

--
7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 245412658

--
730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon <gfalcon@google.com>:

internal change

PiperOrigin-RevId: 245293234

--
cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon <gfalcon@google.com>:

Internal change

PiperOrigin-RevId: 245288164
GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515
Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6

1 files changed, 351 insertions, 0 deletions

diff --git a/absl/flags/BUILD.bazel b/absl/flags/BUILD.bazel
new file mode 100644
index 00000000..2d868b0a
--- /dev/null
+++ b/absl/flags/BUILD.bazel
@@ -0,0 +1,351 @@
+#
+#  Copyright 2019 The Abseil Authors.
+#
+# 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
+#
+#      https://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(
+    "//absl:copts/configure_copts.bzl",
+    "ABSL_DEFAULT_COPTS",
+    "ABSL_DEFAULT_LINKOPTS",
+    "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])  # Apache 2.0
+
+cc_library(
+    name = "internal",
+    srcs = [
+        "internal/program_name.cc",
+    ],
+    hdrs = [
+        "internal/path_util.h",
+        "internal/program_name.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "config",
+    srcs = [
+        "usage_config.cc",
+    ],
+    hdrs = [
+        "config.h",
+        "usage_config.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":internal",
+        "//absl/base:core_headers",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "marshalling",
+    srcs = [
+        "marshalling.cc",
+    ],
+    hdrs = [
+        "marshalling.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        "//absl/base:core_headers",
+        "//absl/strings",
+        "//absl/strings:str_format",
+    ],
+)
+
+cc_library(
+    name = "handle",
+    srcs = [
+        "internal/commandlineflag.cc",
+    ],
+    hdrs = [
+        "internal/commandlineflag.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        ":config",
+        ":marshalling",
+        "//absl/base",
+        "//absl/base:core_headers",
+        "//absl/strings",
+        "//absl/synchronization",
+        "//absl/types:optional",
+    ],
+)
+
+cc_library(
+    name = "registry",
+    srcs = [
+        "internal/registry.cc",
+        "internal/type_erased.cc",
+    ],
+    hdrs = [
+        "internal/registry.h",
+        "internal/type_erased.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        ":config",
+        ":handle",
+        "//absl/base",
+        "//absl/base:core_headers",
+        "//absl/base:dynamic_annotations",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "flag",
+    srcs = [
+        "flag.cc",
+    ],
+    hdrs = [
+        "declare.h",
+        "flag.h",
+        "internal/flag.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":handle",
+        ":marshalling",
+        ":registry",
+        "//absl/base",
+        "//absl/base:core_headers",
+        "//absl/strings",
+    ],
+)
+
+cc_library(
+    name = "usage",
+    srcs = [
+        "internal/usage.cc",
+    ],
+    hdrs = [
+        "internal/usage.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    visibility = [
+        "//absl/flags:__pkg__",
+    ],
+    deps = [
+        ":config",
+        ":flag",
+        ":handle",
+        ":internal",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "parse",
+    srcs = ["parse.cc"],
+    hdrs = [
+        "internal/parse.h",
+        "parse.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":flag",
+        ":handle",
+        ":internal",
+        ":registry",
+        ":usage",
+        "//absl/strings",
+        "//absl/synchronization",
+    ],
+)
+
+############################################################################
+# Unit tests in alpahabetical order.
+
+cc_test(
+    name = "commandlineflag_test",
+    size = "small",
+    srcs = [
+        "internal/commandlineflag_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        ":handle",
+        ":registry",
+        "//absl/memory",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "flag_test",
+    size = "small",
+    srcs = [
+        "flag_test.cc",
+        "flag_test_defs.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "marshalling_test",
+    size = "small",
+    srcs = [
+        "marshalling_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":marshalling",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "path_util_test",
+    size = "small",
+    srcs = [
+        "internal/path_util_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":internal",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "parse_test",
+    size = "small",
+    srcs = [
+        "parse_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        ":parse",
+        "//absl/base",
+        "//absl/base:scoped_set_env",
+        "//absl/strings",
+        "//absl/types:span",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "program_name_test",
+    size = "small",
+    srcs = [
+        "internal/program_name_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":internal",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "type_erased_test",
+    size = "small",
+    srcs = [
+        "internal/type_erased_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":flag",
+        ":registry",
+        "//absl/memory",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "usage_config_test",
+    size = "small",
+    srcs = [
+        "usage_config_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":internal",
+        "//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "usage_test",
+    size = "small",
+    srcs = [
+        "internal/usage_test.cc",
+    ],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":config",
+        ":flag",
+        ":internal",
+        ":parse",
+        ":usage",
+        "//absl/memory",
+        "//absl/strings",
+        "@com_google_googletest//:gtest",
+    ],
+)