如何在编译期间确定MAGICKCORE_QUANTUM_DEPTH和MAGICKCORE_HDRI_ENABLE？

Question

我有一个与ImageMagick 6接口的库。在编译过程中，我会收到以下编译警告(由我推荐为错误)。

我知道在编译过程中使用-DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=0显式定义这些值将解决这个问题(在我的特定安装上)，但是，由于我正在编写CMake配置文件，使它们尽可能可移植，这感觉很脆弱，我真的希望有更好的方法。

这让我回到我的问题：是否有一种方法可以使用cmake、bash或类似于我所链接的库的特定版本来确定MAGICKCORE_HDRI_ENABLE和MAGICKCORE_QUANTUM_DEPTH？

/usr/include/ImageMagick-6/magick/magick-config.h:29:3: error: #warning "you should set MAGICKCORE_QUANTUM_DEPTH to sensible default set it to configure time default" [-Werror=cpp]
 # warning "you should set MAGICKCORE_QUANTUM_DEPTH to sensible default set it to configure time default"
   ^
/usr/include/ImageMagick-6/magick/magick-config.h:30:3: error: #warning "this is an obsolete behavior please fix your makefile" [-Werror=cpp]
 # warning "this is an obsolete behavior please fix your makefile"
   ^
/usr/include/ImageMagick-6/magick/magick-config.h:52:3: error: #warning "you should set MAGICKCORE_HDRI_ENABLE to sensible default set it to configure time default" [-Werror=cpp]
 # warning "you should set MAGICKCORE_HDRI_ENABLE to sensible default set it to configure time default"
   ^
/usr/include/ImageMagick-6/magick/magick-config.h:53:3: error: #warning "this is an obsolete behavior please fix yours makefile" [-Werror=cpp]
 # warning "this is an obsolete behavior please fix yours makefile"
   ^
cc1plus: all warnings being treated as errors

Answer 1

在写这个问题的时候，我遇到了一个答案。我将把它总结为关于这个角度的其他问题，略有不同。

Imagemagick附带了一个名为Magick++-config的安装工具(Ubuntu16.04)，我在/usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16/Magick++-config下找到了这个实用程序。下面是我最后用来提取相关构建选项的cmake代码片段。

find_package(ImageMagick 6.7 COMPONENTS Magick++ MagickCore)
if(ImageMagick_FOUND)
    # Find Imagemagick Library directory
    get_filename_component(MAGICK_LIB_DIR ${ImageMagick_MagickCore_LIBRARY} DIRECTORY)
    # Find where Magick++-config lives
    file(GLOB_RECURSE MAGICK_CONFIG FOLLOW_SYMLINKS ${MAGICK_LIB_DIR}/Magick++-config)
    # Ask about CXX and lib flags/locations
    set(MAGICK_CONFIG ${MAGICK_CONFIG} CACHE string "Path to Magick++-config utility")
    execute_process(COMMAND "${MAGICK_CONFIG}" "--cxxflags" OUTPUT_VARIABLE MAGICK_CXX_FLAGS)
    execute_process(COMMAND "${MAGICK_CONFIG}" "--libs" OUTPUT_VARIABLE MAGICK_LD_FLAGS)
    # Add these to cache
    set(MAGICK_CXX_FLAGS "${MAGICK_CXX_FLAGS}" CACHE string "ImageMagick configuration specific compilation flags." )
    set(MAGICK_LD_FLAGS  "${MAGICK_LD_FLAGS}" CACHE string "ImageMagick configuration specific linking flags.")
    # Split into list:
    string(REGEX MATCHALL "([^\ ]+)" MAGICK_CXX_FLAGS "${MAGICK_CXX_FLAGS}")
    string(REGEX MATCHALL "([^\ ]+)" MAGICK_LD_FLAGS "${MAGICK_LD_FLAGS}")
    # Remove trailing whitespace (CMAKE warns about this)
    string(STRIP "${MAGICK_CXX_FLAGS}" MAGICK_CXX_FLAGS)
    string(STRIP "${MAGICK_LD_FLAGS}" MAGICK_LD_FLAGS)

    target_compile_options(<project> ${MAGICK_CXX_FLAGS})
    target_link_libraries(<project> ${MAGICK_LD_FLAGS})

endif(ImageMagick_FOUND)

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