CMakeList设置CMAKE_PREFIX_PATH

Question

如果我跑步

cmake -DCMAKE_PREFIX_PATH=/home/rip/Qt/5.12.1/gcc_64/lib/cmake

一切正常。但是如果我写

set(CMAKE_PREFIX_PATH "/home/rip/Qt/5.12.1/gcc_64/lib/cmake")

在CMakeLists.txt并且仅运行cmake中，显示以下错误消息：

Could not find a package configuration file provided by "Qt5Quick" with any
  of the following names:

   Qt5QuickConfig.cmake
   qt5quick-config.cmake

这是完整的代码：

set(CMAKE_CXX_FLAGS " -O3 -fopenmp")
set(CMAKE_PREFIX_PATH "/home/rip/Qt/5.12.1/gcc_64/lib/cmake")

project(${PROJECT_NAME} LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(SOURCES main.cpp Test5.cpp )
set(HAEDERS Test5.h )
set(RESOURCES qml.qrc )

find_package(Qt5 COMPONENTS Core Quick REQUIRED)
add_executable(${PROJECT_NAME} ${SOURCES} ${HAEDERS} ${RESOURCES}) 
target_compile_definitions(${PROJECT_NAME} PRIVATE $,$>:QT_QML_DEBUG>) 
target_link_libraries(${PROJECT_NAME} PRIVATE Qt5::Core Qt5::Quick)

Answer 1

前缀路径是路径列表。用这个：

list(APPEND CMAKE_PREFIX_PATH "/home/rip/Qt/5.12.1/gcc_64")

另外，您不必直接指向配置文件路径，也可以指向包含以下内容的目录： lib/cmake/...