How to set up a cmake project in QtCreator to work with postgres *.pgc files?

Question

PostgreSQL

Hello.
I want to make an interface for a training database using ecpg. I would like to create a project in QtCreator using cmake, and edit everything in it, incl. *.pgc files. I tried, but it didn't work. Tell me what needs to be added / corrected in the project settings.
CMakeLists.txt :

cmake_minimum_required(VERSION 2.8)

project(cmake_sample)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -W all")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -I /opt/PostgreSQL/9.4/include -L /opt/PostgreSQL/9.4/lib -l ecpg")

set( PGSQL_CMD "/usr/bin/ecpg" )
set( PGSQL_ARG "ecpg.pgc" )
add_custom_command( OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/ecpg.c
                    COMMAND ${PGSQL_CMD} ${PGSQL_ARG}
                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/ecpg.pgc
                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} )
aux_source_directory(. SRC_LIST)
add_executable(${PROJECT_NAME} ${SRC_LIST} "ecpg.h" "ecpg.pgc")

//ecpg.h
extern "C" {

void ConnectToDB();

}
//ecpg.pgc
#include "ecpg.h"

void ConnectToDB()
{
    EXEC SQL BEGIN DECLARE SECTION;
        char ConnectionString [] = "[email protected]:5432";
        char Login [] = "login";
        char Password [] = "pass";
    EXEC SQL END DECLARE SECTION;
    EXEC SQL CONNECT TO :ConnectionString  USER :Login using :Password;
}
//main.cpp
#include "ecpg.h"
int main()
{
    ConnectToDB();
    return 0;
}

Answer 1

Why not just use QtSql?