Changes imported from Abseil "staging" branch:

- 432508bf64998983b3c194d5f164872ce3c2e573 Put visibility tags into absl external build files by Jon Cohen <cohenjon@google.com>
  - 25d59d11e7b833fe632cddb5bf4d76075ae6282b Use ABSL_PREDICT_TRUE instead of *FALSE for the range che... by Jon Cohen <cohenjon@google.com>
  - 8d8a5890a55ddd19aac849748441eeb57c684f10 Better detection for MSVC support on std::optional. by Xiaoyi Zhang <zhangxy@google.com>
  - c1b31e4a97939885c3bbc23ecb093e9619e73ad1 Internal cleanup by Gennadiy Rozental <rogeeff@google.com>
  - 4f56ad20c4eeccc6f5fb21ec6c7191233d34a090 Internal change. by Matt Calabrese <calabrese@google.com>
  - d2a02b52c75c295708170f4d17b7ff442c8d6a97 Fixed a minor typo in the SimpleAtob() function comment. by Abseil Team <absl-team@google.com>
  - 5adbff5c23a45278d06de2ef3a29ea51b0d1269e Internal cleanup by Gennadiy Rozental <rogeeff@google.com>

GitOrigin-RevId: 432508bf64998983b3c194d5f164872ce3c2e573
Change-Id: I32ddd151d3350b96a22e8f1830f19b59374953ad

absl/base/BUILD.bazel

@@ -25,8 +25,6 @@ package(default_visibility = ["//visibility:public"])
 
 licenses(["notice"])  # Apache 2.0
 
-exports_files(["thread_annotations.h"])
-
 cc_library(
     name = "spinlock_wait",
     srcs = [
@@ -39,6 +37,9 @@ cc_library(
         "internal/spinlock_wait.h",
     ],
     copts = ABSL_DEFAULT_COPTS,
+    visibility = [
+        "//absl/base:__pkg__",
+    ],
     deps = [":core_headers"],
 )
 
@@ -83,6 +84,9 @@ cc_library(
         "internal/malloc_extension_c.h",
     ],
     copts = ABSL_DEFAULT_COPTS,
+    visibility = [
+        "//absl:__subpackages__",
+    ],
     deps = [
         ":core_headers",
         ":dynamic_annotations",
@@ -108,6 +112,9 @@ cc_library(
     textual_hdrs = [
         "internal/malloc_hook_invoke.h",
     ],
+    visibility = [
+        "//absl:__subpackages__",
+    ],
     deps = [
         ":base",
         ":config",
@@ -124,6 +131,9 @@ cc_library(
         "internal/invoke.h",
     ],
     copts = ABSL_DEFAULT_COPTS,
+    visibility = [
+        "//absl:__subpackages__",
+    ],
 )
 
 cc_library(
@@ -183,6 +193,9 @@ cc_library(
     features = [
         "-use_header_modules",
     ],
+    visibility = [
+        "//absl:__subpackages__",
+    ],
     deps = [
         ":base",
         ":config",
@@ -205,6 +218,7 @@ cc_library(
     testonly = 1,
     hdrs = ["internal/exception_testing.h"],
     copts = ABSL_TEST_COPTS,
+    visibility = ["//absl:__subpackages__"],
     deps = [
         ":config",
         "@com_google_googletest//:gtest",

absl/base/config.h

@@ -372,4 +372,19 @@
 #endif
 #endif
 
+// For MSVC, `__has_include` is supported in VS 2017 15.3, which is later than
+// the support for <optional>, <any>, <string_view>. So we use _MSC_VER to check
+// whether we have VS 2017 RTM (when <optional>, <any>, <string_view> is
+// implemented) or higher.
+// Also, `__cplusplus` is not correctly set by MSVC, so we use `_MSVC_LANG` to
+// check the language version.
+// TODO(zhangxy): fix tests before enabling aliasing for `std::any`,
+// `std::string_view`.
+#if defined(_MSC_VER) && _MSC_VER >= 1910 && \
+    ((defined(_MSVC_LANG) && _MSVC_LANG > 201402) || __cplusplus > 201402)
+// #define ABSL_HAVE_STD_ANY 1
+#define ABSL_HAVE_STD_OPTIONAL 1
+// #define ABSL_HAVE_STD_STRING_VIEW 1
+#endif
+
 #endif  // ABSL_BASE_CONFIG_H_