ios - 如何为 iOS 构建 OpenCV 2.4.9？

Question

我正在关注这些 instructions属于 openCV 文档，但它们确实已经过时:提到了 iOS4 或 iOS5，XCode 4.2 安装在/Developer 中，等等。

它没有构建，我有各种错误:

所有初始测试都失败了:-- Performing Test HAVE_CXX_W - Failed 还有:

-- Looking for fseeko
-- Looking for fseeko - not found
-- Looking for unistd.h
-- Looking for unistd.h - not found
-- Looking for sys/types.h
-- Looking for sys/types.h - not found
-- Looking for stdint.h
-- Looking for stdint.h - not found
-- Looking for stddef.h
-- Looking for stddef.h - not found

配置看起来正确:

-- General configuration for OpenCV 2.4.9 =====================================
--   Version control:               2.4.5-1168-g0a42a3e
--
--   Platform:
--     Host:                        Darwin 12.3.0 i386
--     Target:                      iOS
--     CMake:                       2.8.10
--     CMake generator:             Xcode
--     CMake build tool:            /opt/local/bin/cmakexbuild
--     Xcode:                       4.6.2
[...]
--   Media I/O:
--     ZLib:                        build (ver 1.2.7)
--     JPEG:                        build (ver 90)
--     WEBP:                        NO
--     PNG:                         build (ver 1.5.12)
--     TIFF:                        NO
--     JPEG 2000:                   NO
--     OpenEXR:                     NO
--
--   Video I/O:
--     AVFoundation:                YES
--     QuickTime:                   NO
--     QTKit:                       YES
--     V4L/V4L2:                    NO/NO

但后来，我遇到了第一个链接错误: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool:无法打开文件:/Users/ant/xcode/opencv/ios/build/iPhoneOS-armv7/3rdparty/libjpeg/OpenCV.build/Release-iphoneos/libjpeg.build/Objects-normal/armv7/jmemansi.o

我的系统缺少什么来为 iOS 编译 OpenCV？

Answer 1

根据 3rdParty/libjpeg/CMakeLists.txt:12，jmemansi.c 被排除在构建之外:

if(ANDROID OR IOS)
  ocv_list_filterout(lib_srcs jmemansi.c)
else()
  ocv_list_filterout(lib_srcs jmemnobs.c)
endif()

然而，在世界模块构建中，相应的目标文件并没有从链接器输入中排除。这可以通过从链接器输入中过滤掉 jmemansi.o 来解决:

模块/世界/CMakeLists.txt:84

macro(ios_include_3party_libs)
  foreach(l ${ARGN})
    add_dependencies(${the_module} ${l})
    string(REGEX REPLACE "<MODULE_NAME>" "${l}" objpath1 "${CMAKE_BINARY_DIR}/3rdparty/${l}/${objpath0}")
    file(GLOB sources ${CMAKE_SOURCE_DIR}/3rdparty/${l}/*.c)
    foreach(srcname ${sources})
      if(IS_ABSOLUTE "${srcname}")
        file(RELATIVE_PATH srcname "${CMAKE_SOURCE_DIR}/3rdparty/${l}" "${srcname}")
      endif()

      string(REPLACE ".." "__" srcname "${srcname}")
      get_filename_component(srcname_we ${srcname} NAME_WE)
      string(REGEX REPLACE <SRC_NAME_WE> "${srcname_we}" objpath2 "${objpath1}")
      string(REGEX REPLACE <RELATIVE_SRC_NAME> "${srcname}" objpath3 "${objpath2}")

      list(APPEND objlist "\"${objpath3}\"")
    endforeach() # (srcname ${sources})
  endforeach()
  ocv_list_filterout(objlist jmemansi) # <<= dirty fix
endmacro()