C++ 带有cocos2d-x 3 beta 2的Xcode 5.1中的链接器错误

今天我试图在Xcode 5.1中编译我的示例应用程序，但我遇到了链接器错误。有人能告诉我为什么会发生这种情况吗

Ld /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Intermediates/Slot321.build/Debug-iphoneos/Slot321\ iOS.build/Objects-normal/arm64/Slot321\ iOS normal arm64
    cd /Users/mmmssss/Documents/xcode5_projects/Slot321/Slot321/proj.ios_mac
    export IPHONEOS_DEPLOYMENT_TARGET=5.0
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.1.sdk -L/Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos -F/Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos -filelist /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Intermediates/Slot321.build/Debug-iphoneos/Slot321\ iOS.build/Objects-normal/arm64/Slot321\ iOS.LinkFileList -dead_strip -stdlib=libc++ -fobjc-link-runtime -miphoneos-version-min=5.0 /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos/libbox2d\ iOS.a /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos/libchipmunk\ iOS.a /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos/libcocos2dx\ iOS.a /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos/libcocos2dx-extensions\ iOS.a /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Products/Debug-iphoneos/libCocosDenshion\ iOS.a -framework CoreMotion -framework Foundation -framework UIKit -framework CoreGraphics -framework OpenGLES -lz -framework QuartzCore -framework OpenAL -framework AVFoundation -framework AudioToolbox -Xlinker -dependency_info -Xlinker /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Intermediates/Slot321.build/Debug-iphoneos/Slot321\ iOS.build/Objects-normal/arm64/Slot321\ iOS_dependency_info.dat -o /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Intermediates/Slot321.build/Debug-iphoneos/Slot321\ iOS.build/Objects-normal/arm64/Slot321\ iOS

Undefined symbols for architecture arm64:
  "_WebPGetFeaturesInternal", referenced from:
      WebPGetFeatures(unsigned char const*, unsigned long, WebPBitstreamFeatures*) in libcocos2dx iOS.a(CCImage.o)
  "_WebPDecode", referenced from:
      cocos2d::Image::initWithWebpData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_TIFFGetField", referenced from:
      cocos2d::Image::initWithTiffData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_TIFFClose", referenced from:
      cocos2d::Image::initWithTiffData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_CreateDecompress", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_read_header", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_TIFFReadRGBAImageOriented", referenced from:
      cocos2d::Image::initWithTiffData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_start_decompress", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_read_scanlines", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_destroy_decompress", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_WebPInitDecoderConfigInternal", referenced from:
      WebPInitDecoderConfig(WebPDecoderConfig*) in libcocos2dx iOS.a(CCImage.o)
  "_png_create_info_struct", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_read_info", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_std_error", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_image_width", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_set_packing", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_create_read_struct", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_image_height", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_set_palette_to_rgb", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_sig_cmp", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_valid", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_read_end", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_set_longjmp_fn", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "__TIFFfree", referenced from:
      cocos2d::Image::initWithTiffData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_FT_Done_FreeType", referenced from:
      cocos2d::FontFreeType::shutdownFreeType() in libcocos2dx iOS.a(CCFontFreeType.o)
  "_png_set_tRNS_to_alpha", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_rowbytes", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_read_update_info", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_jpeg_mem_src", referenced from:
      cocos2d::Image::initWithJpgData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_set_expand_gray_1_2_4_to_8", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "__TIFFmalloc", referenced from:
      cocos2d::Image::initWithTiffData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_set_strip_16", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_io_ptr", referenced from:
      cocos2d::(anonymous namespace)::pngReadCallback(png_struct_def*, unsigned char*, unsigned long) in libcocos2dx iOS.a(CCImage.o)
  "_png_set_read_fn", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_error", referenced from:
      cocos2d::(anonymous namespace)::pngReadCallback(png_struct_def*, unsigned char*, unsigned long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_bit_depth", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_get_color_type", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_destroy_read_struct", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_TIFFClientOpen", referenced from:
      cocos2d::Image::initWithTiffData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
  "_png_read_image", referenced from:
      cocos2d::Image::initWithPngData(unsigned char const*, long) in libcocos2dx iOS.a(CCImage.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

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这些外部库是否也为

arm64

编译？因为如果没有，则必须在Xcode设置中禁用它，例如，使其

{ARCHS\u STANDARD\u 32BIT}

更改库版本

在我的例子中，我更改了iOS 7.1版本的UIKit.framework、CoreMotion.framework和OpenGLES.framework库。（在构建阶段>使用库链接二进制文件）

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删除红色库并添加新版本。

转到项目设置、生成设置、体系结构，然后选择“其他…”。将字符串修改为

$（ARCHS_标准\u 32_位）

最新版本的cocos2d-x（cocos2d-x v3.0 rc0）修复了此问题。新版本增加了对XCode 5.1的arm64支持

您应该从下载新版本升级项目

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更多信息可以在官方网站上找到。

Cocos2d-x似乎包含了未针对64位体系结构编译的图像库（PNG、JPEG、TIFF）。但是，这并不能向我解释为什么同一个项目将使用Xcode 5.0.2而不是Xcode 5.1进行编译。等等，是的。Xcode 5.1删除了不支持64位的编译选项。在Xcode 5.0.2中，默认情况下仅针对32位体系结构进行编译…这是因为Xcode 5.1删除了32位编译选项。确切地说，您可以指定链接器标志，使其链接到arm 64版本的库，如下所述：