Move Abseil to C++14 minimum

Adds policy checks the raise the minimum C++ version to C++14
and the minimum GCC version to GCC 5

Updates the docs to indicate the C++14 minimum.

PiperOrigin-RevId: 459401288
Change-Id: I18878f0e13001c57e97e26ad7c9a9c9c12c39265

1 files changed, 8 insertions, 7 deletions

diff --git a/README.md b/README.md
index db3a7b44..89790021 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Abseil - C++ Common Libraries
 
 The repository contains the Abseil C++ library code. Abseil is an open-source
-collection of C++ code (compliant to C++11) designed to augment the C++
+collection of C++ code (compliant to C++14) designed to augment the C++
 standard library.
 
 ## Table of Contents
@@ -85,13 +85,14 @@ Abseil contains the following C++ library components:
   <br /> The `hash` library contains the hashing framework and default hash
   functor implementations for hashable types in Abseil.
 * [`memory`](absl/memory/)
-  <br /> The `memory` library contains C++11-compatible versions of
-  `std::make_unique()` and related memory management facilities.
+  <br /> The `memory` library contains memory management facilities that
+  augment C++'s `<memory>` library.
 * [`meta`](absl/meta/)
-  <br /> The `meta` library contains C++11-compatible versions of type checks
+  <br /> The `meta` library contains compatible versions of type checks
   available within C++14 and C++17 versions of the C++ `<type_traits>` library.
 * [`numeric`](absl/numeric/)
-  <br /> The `numeric` library contains C++11-compatible 128-bit integers.
+  <br /> The `numeric` library contains 128-bit integer types as well as
+  implementations of C++20's bitwise math functions.
 * [`profiling`](absl/profiling/)
   <br /> The `profiling` library contains utility code for profiling C++
   entities.  It is currently a private dependency of other Abseil libraries.
@@ -100,7 +101,7 @@ Abseil contains the following C++ library components:
   `absl::Status` and `absl::StatusOr<T>`.
 * [`strings`](absl/strings/)
   <br /> The `strings` library contains a variety of strings routines and
-  utilities, including a C++11-compatible version of the C++17
+  utilities, including a C++14-compatible version of the C++17
   `std::string_view` type.
 * [`synchronization`](absl/synchronization/)
   <br /> The `synchronization` library contains concurrency primitives (Abseil's
@@ -112,7 +113,7 @@ Abseil contains the following C++ library components:
   time zones.
 * [`types`](absl/types/)
   <br /> The `types` library contains non-container utility types, like a
-  C++11-compatible version of the C++17 `std::optional` type.
+  C++14-compatible version of the C++17 `std::optional` type.
 * [`utility`](absl/utility/)
   <br /> The `utility` library contains utility and helper code.