set_target_properties調用的參數數量不正確？

Question

這裏是我的簡單的CMakeLists.txt文件：

include_directories (${CMAKE_SOURCE_DIR}/common) 
find_package(Threads) 

add_library (libusbmuxd SHARED libusbmuxd.c sock_stuff.c ${CMAKE_SOURCE_DIR}/common/utils.c) 
find_library (PTHREAD pthread) 
target_link_libraries (libusbmuxd ${CMAKE_THREAD_LIBS_INIT}) 

# 'lib' is a UNIXism, the proper CMake target is usbmuxd 
# But we can't use that due to the conflict with the usbmuxd daemon, 
# so instead change the library output base name to usbmuxd here 
set_target_properties(libusbmuxd PROPERTIES OUTPUT_NAME usbmuxd) 
set_target_properties(libusbmuxd PROPERTIES VERSION ${LIBUSBMUXD_VERSION}) 
set_target_properties(libusbmuxd PROPERTIES SOVERSION ${LIBUSBMUXD_SOVERSION}) 

install(TARGETS libusbmuxd 
    ARCHIVE DESTINATION lib${LIB_SUFFIX} 
    LIBRARY DESTINATION lib${LIB_SUFFIX} 
) 
install(FILES usbmuxd.h usbmuxd-proto.h DESTINATION include) 

這給了我一個錯誤：
CMake error at CMakeLists.txt:12 (set_target_properties):
set_target_properties called with incorrect number of arguments

CMake error at CMakeLists.txt:13 (set_target_properties):
set_target_properties called with incorrect number of arguments 這些是第二和第三set_target_properties。第一個set_target_properties從來沒有這個問題？
（如果你還沒有已經意識到，我正在試圖建立usbmuxd-1.0.4）

Answer 1

SET_TARGET_PROPERTIES的格式爲：

SET_TARGET_PROPERTIES(
    target1 target2 ... targetM 
    PROPERTIES 
    prop1 val1 prop2 val2 ... propN valN 
) 

的原因嗎？問題是你的變量LIBUSBMUXD_VERSION和LIBUSBMUXD_SOVERSION是不確定的，所以你的命令的語法是：

SET_TARGET_PROPERTIES(target PROPERTIES name) 

相反的：

SET_TARGET_PROPERTIES(target PROPERTIES name value) 

要解決此問題，請嘗試引用變量;使用「$ {LIBUSBMUXD_SOVERSION}」應該確保它接受空字符串的值，即使變量未定義也是如此，從而遵守語法。