Fix CMAKE issues mentioned in #2144 and a linking problem which manifest with gcc12.3 when building with shared libs (#2208) (#2213)

* Respect find_package QUIET

* Add policy_max to cmake_minimum_required
Avoid deprecation warning introduced by cmake 3.31

* Add missing DROGON_EXPORT

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.5...3.31)
 
 project(drogon)
 

cmake/ParseAndAddDrogonTests.cmake

@@ -17,7 +17,7 @@
 #        ParseAndAddDrogonTests(${PROJECT_NAME})                                                   #
 #==================================================================================================#
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.5...3.31)
 
 # This removes the contents between
 #  - block comments (i.e. /* ... */) 

cmake_modules/FindJsoncpp.cmake

@@ -51,7 +51,9 @@ if(Jsoncpp_FOUND)
       COMMAND awk "{ printf \$3 }"
       COMMAND sed -e "s/\"//g"
       OUTPUT_VARIABLE jsoncpp_ver)
+    if(NOT Jsoncpp_FIND_QUIETLY)
       message(STATUS "jsoncpp version:" ${jsoncpp_ver})
+    endif()
     if(jsoncpp_ver LESS 1.7)
       message(
         FATAL_ERROR

lib/inc/drogon/RequestStream.h

@@ -88,7 +88,7 @@ class StreamError final : public std::exception
  * An interface for stream request reading.
  * User should create an implementation class, or use built-in handlers
  */
-class RequestStreamReader
+class DROGON_EXPORT RequestStreamReader
 {
   public:
     virtual ~RequestStreamReader() = default;