fix: update the c++ version selection process

The c++ version should be set via `target_compile_features(SQLiteCpp
PUBLIC cxx_std_11)`
This only sets this as a minimum version for this target, and not all
targets.

Author: SGSSGene

CMakeLists.txt

@@ -8,15 +8,6 @@ cmake_minimum_required(VERSION 3.5)
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake") # custom CMake modules like FindSQLiteCpp
 project(SQLiteCpp VERSION 3.3.3)
 
-# SQLiteC++ 3.x requires C++11 features
-if (NOT CMAKE_CXX_STANDARD)
-    set(CMAKE_CXX_STANDARD 11)
-elseif (CMAKE_CXX_STANDARD LESS 11)
-    message(WARNING "CMAKE_CXX_STANDARD has been set to '${CMAKE_CXX_STANDARD}' which is lower than the minimum required standard (c++11).")
-endif ()
-message(STATUS "Using c++ standard c++${CMAKE_CXX_STANDARD}")
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
 message (STATUS "CMake version: ${CMAKE_VERSION}")
 message (STATUS "Project version: ${PROJECT_VERSION}")
 
@@ -213,6 +204,9 @@ endif()
 # add sources of the wrapper as a "SQLiteCpp" static library
 add_library(SQLiteCpp ${SQLITECPP_SRC} ${SQLITECPP_INC} ${SQLITECPP_DOC} ${SQLITECPP_SCRIPT})
 
+# set minimum version to c++11
+target_compile_features(SQLiteCpp PUBLIC cxx_std_11)
+
 # Options relative to SQLite and SQLiteC++ functions
 
 option(SQLITE_ENABLE_COLUMN_METADATA "Enable Column::getColumnOriginName(). Require support from sqlite3 library." ON)