Bumped version to v1.5.3 for release and updated the README and CHANGELOG

Author: fpagliughi

CHANGELOG.md

@@ -6,6 +6,14 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Version 1.5.3](https://github.com/eclipse/paho.mqtt.cpp/compare/v1.5.2..v1.5.3) (2025-05-15)
+
+- Fix the bundled Paho C build foc C23 compilers by forcing C99 compliance in CMake build
+- [#544](https://github.com/eclipse-paho/paho.mqtt.cpp/pull/544) and [#550](https://github.com/eclipse-paho/paho.mqtt.cpp/pull/550) Use std::vector<unsigned char> for the ALPN protocol list in wire format
+- [#547](https://github.com/eclipse-paho/paho.mqtt.cpp/pull/547) Fixed up some of the v5 examples for proper connect options
+- [#549](https://github.com/eclipse-paho/paho.mqtt.cpp/pull/549) Update TEST_EXTERNAL_SERVER urls
+
+
 ## [Version 1.5.2](https://github.com/eclipse/paho.mqtt.cpp/compare/v1.5.1..v1.5.2) (2025-03-11)
 
 - Fixed the Version number and string.

CMakeLists.txt

@@ -24,7 +24,7 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-project(PahoMqttCpp VERSION "1.5.1")
+project(PahoMqttCpp VERSION "1.5.3")
 
 ## --- Build options ---
 

README.md

@@ -46,6 +46,8 @@ The primary changes in the v1.5 versions are:
 - Bump the CMake to v3.13
 - Fix a large number of CMake build issues
 - Updated the GitHub CI
+- (v1.5.3) Fixes for building this library and the Paho C library with the latest C & C++ compilers, like Clang 20 and GCC 15 which created some breaking hcanges for legacy code.
+
 
 For the full list of updates in each release, see the [CHANGELOG](https://github.com/eclipse-paho/paho.mqtt.cpp/blob/master/CHANGELOG.md).
 
@@ -100,7 +102,7 @@ This requires the CMake option `PAHO_WITH_MQTT_C` set.
 ```
 $ git clone https://github.com/eclipse/paho.mqtt.cpp
 $ cd paho.mqtt.cpp
-$ git co v1.5.2
+$ git co v1.5.3
 
 $ git submodule init
 $ git submodule update
@@ -173,7 +175,7 @@ If the Paho C library is not already installed, the recommended version can be b
 
     $ git clone https://github.com/eclipse/paho.mqtt.cpp
     $ cd paho.mqtt.cpp
-    $ git co v1.5.2
+    $ git co v1.5.3
     $ git submodule init
     $ git submodule update
 

dist/paho-cpp.spec

@@ -1,6 +1,6 @@
 Summary:            MQTT CPP Client
 Name:               paho-cpp
-Version:            1.5.1
+Version:            1.5.3
 Release:            0%{?dist}
 License:            Eclipse Eclipse Public License 2.0 and Distribution License 1.0
 Group:              Development/Tools

include/mqtt/async_client.h

@@ -65,16 +65,16 @@ namespace mqtt {
 
 #if defined(PAHO_MQTTPP_VERSIONS)
 /** The version number for the client library. */
-const uint32_t PAHO_MQTTPP_VERSION = 0x01050002;
+const uint32_t PAHO_MQTTPP_VERSION = 0x01050003;
 /** The version string for the client library  */
-const string PAHO_MQTTPP_VERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.2");
+const string PAHO_MQTTPP_VERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.3");
 /** Copyright notice for the client library */
 const string PAHO_MQTTPP_COPYRIGHT("Copyright (c) 2013-2025 Frank Pagliughi");
 #else
 /** The version number for the client library. */
-const uint32_t VERSION = 0x01050002;
+const uint32_t VERSION = 0x01050003;
 /** The version string for the client library  */
-const string VERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.2");
+const string VERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.3");
 /** Copyright notice for the client library */
 const string COPYRIGHT("Copyright (c) 2013-2025 Frank Pagliughi");
 #endif

src/ssl_options.cpp

@@ -332,7 +332,7 @@ void ssl_options::set_alpn_protos(const std::vector<string>& protos)
         protos_ = std::move(protoBin);
 
         opts_.protos = protos_.data();
-        opts_.protos_len = unsigned(protos_.size());
+        opts_.protos_len = static_cast<unsigned>(protos_.size());
     }
     else {
         protos_.clear();