Export of internal Abseil changes.

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

internal changes

PiperOrigin-RevId: 247073879

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

Release commandline flags

PiperOrigin-RevId: 247065920

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

Add documentation for built-in usage flags

PiperOrigin-RevId: 247058863

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

Internal change

PiperOrigin-RevId: 247058292

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

Internal Change.

PiperOrigin-RevId: 246828655

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

Internal change

PiperOrigin-RevId: 246822325

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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

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

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

PiperOrigin-RevId: 246406528

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

Internal change

PiperOrigin-RevId: 246358214

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

Fix sample template instantiation.

PiperOrigin-RevId: 246354617

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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

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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

absl/copts/GENERATED_AbseilCopts.cmake

@@ -201,6 +201,7 @@ list(APPEND ABSL_MSVC_FLAGS
     "/wd4180"
     "/wd4244"
     "/wd4267"
+    "/wd4503"
     "/wd4800"
 )
 

absl/copts/GENERATED_copts.bzl

@@ -202,6 +202,7 @@ ABSL_MSVC_FLAGS = [
     "/wd4180",
     "/wd4244",
     "/wd4267",
+    "/wd4503",
     "/wd4800",
 ]
 

absl/copts/copts.py

@@ -163,8 +163,8 @@ COPT_VARS = {
     "ABSL_LLVM_TEST_FLAGS":
         LLVM_TEST_DISABLE_WARNINGS_FLAGS,
     "ABSL_LLVM_EXCEPTIONS_FLAGS": ["-fexceptions"],
-    "ABSL_CLANG_CL_FLAGS": (
-        MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
+    "ABSL_CLANG_CL_FLAGS":
+        (MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
     "ABSL_CLANG_CL_TEST_FLAGS":
         LLVM_TEST_DISABLE_WARNINGS_FLAGS,
     "ABSL_CLANG_CL_EXCEPTIONS_FLAGS":
@@ -179,6 +179,8 @@ COPT_VARS = {
             "/wd4244",
             # conversion from 'size_t' to 'type', possible loss of data
             "/wd4267",
+            # The decorated name was longer than the compiler limit
+            "/wd4503",
             # forcing value to bool 'true' or 'false' (performance warning)
             "/wd4800",
         ],

absl/copts/generate_copts.py

@@ -70,8 +70,9 @@ class StarlarkStyle(object):
     return "GENERATED_copts.bzl"
 
 
-# Copt file generation
 def copt_list(name, arg_list, style):
+  """Copt file generation."""
+
   make_line = lambda s: "    \"" + s + "\"" + style.separator()
   external_str_list = [make_line(s) for s in arg_list]