CMake и Qt4: Невозможно указать ссылку библиотеки для целевой

Question

После некоторого привета мира с квартой и CMake, это моя структура складки:

CMakeLists.txt 
main.cpp 
ui/mainwindow.ui 
src/mainwindow.cpp 
include/mainwindow.h 

и это CMakeList.txt:

cmake_minimum_required (VERSION 2.8) 

# Project 
set(PROJECTNAME "Hello") 
project(${PROJECTNAME} C CXX) 

set(${PROJECTNAME}_MAJOR_VERSION 0) 
set(${PROJECTNAME}_MINOR_VERSION 1) 

# qt 
find_package(Qt4 REQUIRED) 
set (QT_USE_QTMAIN TRUE) 

include (${QT_USE_FILE}) 
add_definitions(${QT_DEFINITIONS}) 

# compilers 
#set(CMAKE_CXX_FLAGS "-Wall -std=gnu++0x") 

# files 
include_directories(${CMAKE_CURRENT_BINARY_DIR}) 
include_directories(src) 
include_directories(include) 

set(${PROJECTNAME}_SOURCES 
    main.cpp 
    src/mainwindow.cpp 
) 

set(${PROJECTNAME}_HEADERS 
    include/mainwindow.h 
) 

set(${PROJECTNAME}_HEADERS_MOC 
    include/mainwindow.h 
) 

set(${PROJECTNAME}_FORMS 
    ui/mainwindow.ui 
) 

QT4_WRAP_CPP(${PROJECTNAME}_HEADERS_MOC ${${PROJECTNAME}_HEADERS_MOC}) 
QT4_WRAP_UI(${PROJECTNAME}_FORMS_HEADERS ${${PROJECTNAME}_FORMS}) 
QT4_ADD_RESOURCES(${PROJECTNAME}_RESOURCES_RCC ${${PROJECTNAME}_RESOURCES}) 

# executables and installation 
add_executable (
    ${${PROJECTNAME}_HEADERS} 
    ${${PROJECTNAME}_SOURCES} 
    ${${PROJECTNAME}_HEADERS_MOC} 
    ${${PROJECTNAME}_FORMS_HEADERS} 
) 

target_link_libraries(${PROJECTNAME} ${QT_LIBRARIES}) 

судимых различные способы добавления target_link_libraries, но все равно получить:

-- The C compiler identification is GNU 
-- The CXX compiler identification is GNU 
-- Check for working C compiler: /usr/bin/gcc 
-- Check for working C compiler: /usr/bin/gcc -- works 
-- Detecting C compiler ABI info 
-- Detecting C compiler ABI info - done 
-- Check for working CXX compiler: /usr/bin/c++ 
-- Check for working CXX compiler: /usr/bin/c++ -- works 
-- Detecting CXX compiler ABI info 
-- Detecting CXX compiler ABI info - done 
-- Looking for Q_WS_X11 
-- Looking for Q_WS_X11 - found 
-- Looking for Q_WS_WIN 
-- Looking for Q_WS_WIN - not found. 
-- Looking for Q_WS_QWS 
-- Looking for Q_WS_QWS - not found. 
-- Looking for Q_WS_MAC 
-- Looking for Q_WS_MAC - not found. 
-- Found Qt4: /usr/bin/qmake (found version "4.8.1") 
CMake Error at CMakeLists.txt:61 (target_link_libraries): 
    Cannot specify link libraries for target "Hello" which is not built by 
    this project. 


-- Configuring incomplete, errors occurred! 

Answer 1

Вам не хватает целевого имени в качестве первого параметра r для add_executable.

add_executable( 
    ${PROJECTNAME}  
    ${${PROJECTNAME}_HEADERS} 
    ${${PROJECTNAME}_SOURCES} 
    ${${PROJECTNAME}_HEADERS_MOC} 
    ${${PROJECTNAME}_FORMS_HEADERS} 
)