fix(cmake): increase minimum version to 3.15, fix Data::PostgreSQL in…

…clude target, remove unnecessary cmake modules that are provided with CMake itself (#4540)

CMakeLists.txt

@@ -1,5 +1,4 @@
-cmake_minimum_required(VERSION 3.5.0)
-cmake_policy(VERSION 3.15.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 project(Poco)
 
@@ -33,12 +32,6 @@ endforeach(OUTPUTCONFIG)
 # Append our module directory to CMake
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
-if(CMAKE_VERSION VERSION_LESS "3.10")
-	list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/V39)
-endif()
-if(CMAKE_VERSION VERSION_LESS "3.14")
-	list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/V313)
-endif()
 #################################################################################
 # Setup C/C++ compiler options
 #################################################################################
@@ -562,10 +555,6 @@ install(
 if(POCO_UNBUNDLED)
 	install(FILES cmake/FindPCRE2.cmake
 			DESTINATION "${PocoConfigPackageLocation}")
-	install(FILES cmake/V39/FindEXPAT.cmake
-			DESTINATION "${PocoConfigPackageLocation}/V39")
-	install(FILES cmake/V313/FindSQLite3.cmake
-			DESTINATION "${PocoConfigPackageLocation}/V313")
 endif()
 
 message(STATUS "CMake ${CMAKE_VERSION} successfully configured ${PROJECT_NAME} using ${CMAKE_GENERATOR} generator")

Data/PostgreSQL/CMakeLists.txt

@@ -21,7 +21,7 @@ set_target_properties(DataPostgreSQL
 	DEFINE_SYMBOL PostgreSQL_EXPORTS
 )
 
-target_link_libraries(DataPostgreSQL PUBLIC Poco::Data PostgreSQL::client)
+target_link_libraries(DataPostgreSQL PUBLIC Poco::Data PostgreSQL::PostgreSQL)
 target_include_directories(DataPostgreSQL
 	PUBLIC
 		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>

README.md

@@ -24,7 +24,7 @@ and [Getting Started](https://pocoproject.org/docs/00200-GettingStarted.html) do
 
 ### Prerequisites
 
-- CMake 3.5 or newer
+- CMake 3.15 or newer
 - A C++17 compiler (Visual C++ 2017, GCC 8.0, Clang 5, or newer)
 - OpenSSL headers and libraries (optional, but recommended)
 - MySQL, PostgreSQL and ODBC client libraries (optional)
@@ -76,7 +76,7 @@ $ brew install cmake openssl mysql-client libpq
 
 ### Building with CMake (Linux, macOS, Windows)
 
-[CMake](https://cmake.org) (version 3.5 or newer) is the recommended build system for
+[CMake](https://cmake.org) (version 3.15 or newer) is the recommended build system for
 building the POCO C++ Libraries.
 
 ```