CMake生成的源不编译

Question

我添加了代码来使用QT的MOC可执行文件生成一个文件。当我尝试构建它时，会生成该文件，但它不会被编译。

find_program (QT_UIC uic) 
find_program (QT_MOC moc) 

set(TARGET_LIBRARY support_qt_${UNICODE_FLAG}${STATIC_FLAG}${BUILD_TYPE_FLAG}) 

# Enable the build directory as an include path as well, required for 
# qt moc generated files. 
set(CMAKE_INCLUDE_CURRENT_DIR ON) 

find_package(Qt5Widgets REQUIRED) 
find_package(Qt5Core REQUIRED) 
find_package(Qt5Gui REQUIRED) 

include_directories(${Qt5Widgets_INCLUDES}) 
include_directories("..") 

set(SUPPORT_SOURCE 
    ${CMAKE_CURRENT_SOURCE_DIR}/support_qt_dll_api.h 
    ${CMAKE_CURRENT_SOURCE_DIR}/supportlib_qt_namespace.h 
    ${CMAKE_CURRENT_SOURCE_DIR}/dll_main.cpp 
) 

if (STATIC_BUILD) 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DBUILD_SUPPORT_QT_STATIC") 
else (NOT STATIC_BUILD) 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DBUILD_SUPPORT_QT_DLL") 
endif() 

if (UNICODE_BUILD) 
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DUNICODE") 
endif() 

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -pedantic -Wextra") 

set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DDEBUG") 
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3") 

add_subdirectory (logging) 
add_subdirectory (models) 
add_subdirectory (window) 

#QT5_WRAP_UI(QT_UI_HEADERS ${QT_UI_SOURCES}) 

# Process each .ui file and create a dependency to the 
# the corresponding .h file. 
set(GENERATED_SOURCES "") 
foreach(ui_file ${SUPPORT_SOURCE}) 
    get_filename_component(ui_ext ${ui_file} EXT) 
    string(TOLOWER ${ui_ext} ui_ext) 

    set(ui_dependency "") 
    string(REPLACE "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" ui_gen_file ${ui_file}) 
    if(${ui_ext} STREQUAL ".ui") 
     string(REGEX REPLACE ".ui$" ".h" ui_gen_file "${ui_gen_file}") 
     add_custom_command(
      #PRE_BUILD 
      OUTPUT "${ui_gen_file}" 
      COMMAND ${QT_UIC} -g cpp -o "${ui_gen_file}" "${ui_file}" 
      MAIN_DEPENDENCY "${ui_file}" 
      COMMENT "Generating UI: ${ui_gen_file}" 
     ) 

     # A .ui File always has a .moc file with it. 
     string(REGEX REPLACE ".h$" ".moc" ui_gen_file "${ui_gen_file}") 
     set(ui_ext ".moc") 
    endif() 

    if(${ui_ext} STREQUAL ".moc") 
     string(REGEX REPLACE ".moc$" ".cpp" ui_gen_file "${ui_gen_file}") 
     set(GENERATED_SOURCES "${GENERATED_SOURCES} ${ui_gen_file}") 
     add_custom_command(
      #PRE_BUILD 
      OUTPUT "${ui_gen_file}" 
      COMMAND ${QT_MOC} -o "${ui_gen_file}" -f "${ui_file}" "${ui_file}" 
      MAIN_DEPENDENCY "${ui_file}" 
      COMMENT "Generating MOC: ${ui_gen_file}" 
     ) 

     set(GENERATED_SOURCE "${GENERATED_SOURCE} ${ui_gen_file}") 
     #message("Generated: ${ui_gen_file}") 
    endif() 

endforeach() 

set_source_files_properties(${GENERATED_SOURCES} PROPERTIES GENERATED TRUE) 
add_library(${TARGET_LIBRARY} ${BUILD_TYPE} ${SUPPORT_SOURCE} ${GENERATED_SOURCES}) 
target_link_libraries(${TARGET_LIBRARY} Qt5::Widgets) 

set_target_properties(${TARGET_LIBRARY} PROPERTIES 
         RUNTIME_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} 
         ARCHIVE_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} 
         LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_PATH} 
) 

当我删除从append_library的${GENERATED_SOURCES}我得到这个错误：

CMake Error at support_qt/CMakeLists.txt:109 (add_library): 
    Cannot find source file: 

    D:/src/c/support_lib/build/support_qt/logging/logging_dialog_box_gui.cpp D:/src/c/support_lib/b 
uild/support_qt/logging/logging_dialog_box_gui.cpp 

    Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp 
    .hxx .in .txx 

CMake Error: CMake can not determine linker language for target: support_qt_ad 
CMake Error: Cannot determine link language for target "support_qt_ad". 

我曾经见过类似的脚本使用add_custom_command显示，但是当我这样做，我得到其他帖子：

mingw32-make[2]: *** No rule to make target 'support_qt/ D:/src/c/support_lib/build/support_qt/loggi 
ng/logging_dialog_box_gui.cpp D:/src/c/support_lib/build/support_qt/logging/logging_dialog_box_gui.c 
pp', needed by 'support_qt/CMakeFiles/support_qt_ad.dir/_D_/src/c/support_lib/build/support_qt/loggi 
ng/logging_dialog_box_gui.cpp_D_/src/c/support_lib/build/support_qt/logging/logging_dialog_box_gui.c 
pp.obj'. Stop. 
CMakeFiles\Makefile2:236: recipe for target 'support_qt/CMakeFiles/support_qt_ad.dir/all' failed 
mingw32-make[1]: *** [support_qt/CMakeFiles/support_qt_ad.dir/all] Error 2 
makefile:74: recipe for target 'all' failed 
mingw32-make: *** [all] Error 2 

并且该文件不是仅编译生成的。

更新：

我也试过set(CMAKE_AUTOMOC ON)和产生的CPP被编译，但只有一次。当修改moc或包含的ui文件时，它不更新它。看到一个完整的工作示例将会很有帮助。当我谷歌我只找到片段。 :(

Answer 1

这应该足以设置：SET(CMAKE_AUTOMOC ON)指示的CMake在需要时自动运行MOC（需要CMake的2.8.6+） 不要忘了从append_library删除${GENERATED_SOURCES}

也。添加QT5_WRAP_UI宏，例如：

FILE (GLOB_RECURSE project_UIS *.ui) 
QT5_WRAP_UI(project_FORM_HDR ${project_UIS}) 

ADD_LIBRARY(${project_LIB} ${project_SRCS} ${project_FORM_HDR}) 

编辑：工作的完整示例为了简化一些无关痛痒的Qt的东西省略

。 210

LIST (APPEND CMAKE_PREFIX_PATH "/opt/Qt5.4.1/5.4/gcc_64") 

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

# Widgets finds its own dependencies (QtGui and QtCore). 
FIND_PACKAGE(Qt5Widgets REQUIRED) 

FILE (GLOB_RECURSE project_SRCS *.cpp *.cxx *.cc *.C *.c *.h *.hpp) 
SET (project_LIBS Qt5::Widgets) 
SET (project_BIN ${APP_NAME}) 

FILE (GLOB_RECURSE project_UIS *.ui) 
QT5_WRAP_UI(project_FORM_HDR ${project_UIS}) 

ADD_EXECUTABLE(${project_BIN} ${project_SRCS} ${project_FORM_HDR}) 
TARGET_LINK_LIBRARIES(${project_BIN} ${project_LIBS})