build: use C++17

CMakeLists.txt

@@ -19,7 +19,7 @@ include(FindPkgConfig)
 include(cmake/CheckAtomic.cmake)
 
 set (opendht_VERSION_MAJOR 2)
-set (opendht_VERSION_MINOR 3.5)
+set (opendht_VERSION_MINOR 4.0)
 set (opendht_VERSION ${opendht_VERSION_MAJOR}.${opendht_VERSION_MINOR})
 set (PACKAGE_VERSION ${opendht_VERSION})
 set (VERSION "${opendht_VERSION}")
@@ -124,7 +124,7 @@ if (OPENDHT_HTTP OR OPENDHT_PEER_DISCOVERY)
 endif()
 
 # Build flags
-set (CMAKE_CXX_STANDARD 14)
+set (CMAKE_CXX_STANDARD 17)
 set (CMAKE_CXX_STANDARD_REQUIRED on)
 
 if (NOT MSVC)

README.md

@@ -4,7 +4,7 @@
     <a id="user-content-opendht-" class="anchor" href="/savoirfairelinux/opendht/blob/master/README.md#opendht-" aria-hidden="true"></a>OpenDHT
 </h1>
 
-A lightweight C++14 Distributed Hash Table implementation.
+A lightweight C++17 Distributed Hash Table implementation.
 
 OpenDHT provides an easy to use distributed in-memory data store.
 Every node in the network can read and write values to the store.
@@ -14,7 +14,7 @@ Values are distributed over the network, with redundancy.
  * High resilience to network disruption
  * Public key cryptography layer providing optional data signature and encryption (using GnuTLS)
  * IPv4 and IPv6 support
- * Clean and powerful **C++14** map API
+ * Clean and powerful **C++17** map API
  * Bindings for **C, Rust & Python 3**
  * REST API with optional HTTP client+server with push notification support
 
@@ -27,7 +27,7 @@ Build instructions: <https://github.com/savoirfairelinux/opendht/wiki/Build-the-
 
 #### How-to build a simple client app
 ```bash
-g++ main.cpp -std=c++14 -lopendht
+g++ main.cpp -std=c++17 -lopendht
 ```
 
 ## Examples
@@ -98,8 +98,8 @@ for r in results:
 - Nettle 2.4+, a GnuTLS dependency for crypto.
 - (optional) restinio used for the REST API.
 - (optional) jsoncpp 1.7.4-3+, used for the REST API.
-- Build tested with GCC 5.2+ (GNU/Linux, Windows with MinGW), Clang/LLVM (GNU/Linux, Android, macOS, iOS).
-- Build tested with Microsoft Visual Studio 2015, 2017, 2019
+- Build tested with GCC 7+ (GNU/Linux, Windows with MinGW), Clang/LLVM (GNU/Linux, Android, macOS, iOS).
+- Build tested with Microsoft Visual Studio 2017, 2019, 2021
 
 ## Contact
 

configure.ac

 dnl define macros
 m4_define([opendht_major_version], 2)
-m4_define([opendht_minor_version], 3)
-m4_define([opendht_patch_version], 5)
+m4_define([opendht_minor_version], 4)
+m4_define([opendht_patch_version], 0)
 m4_define([opendht_version],
 		  [opendht_major_version.opendht_minor_version.opendht_patch_version])
 
@@ -102,7 +102,7 @@ AS_IF([test "x$SYS" = "xandroid"],
 LT_INIT()
 LT_LANG(C++)
 
-AX_CXX_COMPILE_STDCXX(14,[noext],[mandatory])
+AX_CXX_COMPILE_STDCXX(17,[noext],[mandatory])
 
 PKG_PROG_PKG_CONFIG()