如何在qt5_add_binary_resources中使用CMake生成rcc文件

Question

我正在尝试使用rcc 宏创建CMake文件

qt5_add_binary_resources(myApp "themes/redTheme.qrc" OPTIONS ARGS -binary)

由于我在CMakeLists文件中使用其他宏(如CMakeLists文件中的target)，所以我得到了以下错误：

CMake Error at C:/Qt/5.5/msvc2013/lib/cmake/Qt5Core/Qt5CoreMacros.cmake:255 (add_custom_target):
  add_custom_target cannot create target
  "myApp" because another target with the
  same name already exists.  The existing target is an executable created in
  source directory [..]

注意，我的CMakeLists文件嵌套在根CMakeLists中。

编辑：I看了一下qt5_add_binary_resources宏的定义 (1.226)。最后一行是引发我错误的命令。它似乎什么也没做：

add_custom_target(${target} ALL DEPENDS ${rcc_destination})

我不明白为什么宏需要一个target

编辑：这里是我的CMakeLists.txt的内容，尽管出于清晰的原因而简化了。

CMAKE_MINIMUM_REQUIRED(VERSION 3.4)
CMAKE_POLICY(SET CMP0002 NEW)

PROJECT(myApp)

SET(RCC_EXECUTABLE ${CMAKE_PREFIX_PATH}/bin/rcc.exe)

# Find includes in corresponding build directories
SET(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed
SET(CMAKE_AUTOMOC ON)
SET(CMAKE_AUTORCC ON)

FIND_PACKAGE(Qt5Core 5.5.0 REQUIRED)
FIND_PACKAGE(Qt5Widgets 5.5.0 REQUIRED)
FIND_PACKAGE(Qt5Qml 5.5.0 REQUIRED)
FIND_PACKAGE(Qt5Quick 5.5.0 REQUIRED)

INCLUDE_DIRECTORIES(${BOOST_INCLUDE_DIRS})
# etc.

SET(myApp_LIBRARIES
    ${BOOST_THREAD_LIBRARIES}
    ${BOOSTALL_LIBRARIES}
    Qt5::Core
    Qt5::Widgets
    Qt5::Qml
    Qt5::Quick
)

SET(myApp_LIBRARIES
        ${myApp_LIBRARIES}
)

SET(myApp_SOURCES
    source/main.cpp
)

SET(myApp_RESOURCES
    resources/qml.qrc
)

SET(myApp_EXTERNAL_BINARY_RESOURCES
    themes/redTheme.qrc
    themes/blueTheme.qrc
)

ADD_EXECUTABLE(myApp WIN32
        ${myApp_SOURCES} ${myApp_RESOURCES}
)

FOREACH(_qrc_file ${myApp_EXTERNAL_BINARY_RESOURCES})
    STRING(REPLACE "qrc" "rcc" _rcc_file ${_qrc_file})
    # This is where I'd like to create my binary resources
    # QT5_ADD_BINARY_RESOURCES("test.rcc" ${_qrc_file})
    # Current working process, but not clean
    EXECUTE_PROCESS(COMMAND ${RCC_EXECUTABLE} -binary ${CMAKE_CURRENT_SOURCE_DIR}/${_qrc_file} -o ${CMAKE_CURRENT_SOURCE_DIR}/${_rcc_file})
ENDFOREACH()

根据这个文件，我试图生成两个rcc文件：redTheme.rcc和blueTheme.rcc。

Answer 1

顺便说一下..。您不需要传递"OPTIONS ARGS -binary“，因为它已经定义为二进制。您需要传递一个目标名称，因为您可以调用"make“来手动生成rcc文件。此外，rcc文件将由"all“目标生成，如果您将其作为依赖项添加到另一个add_dependeny目标中。rcc文件不会在cmake配置时生成，而是在编译时生成。此外，如果文件更改，它将被重新生成。

因此，您需要传递一个未使用的目标名称，因为错误告诉您！