为什么我的链接器尝试链接旧的 iOS SDK？

Question

我现在可以构建我的 iOS 项目，但是我收到了两个像下面这样的警告，这真的让我很恼火：（

ld: warning: directory not found for option
    '-L/Users/brennon/Development/MobileMuse/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib'

已经在几行上破坏了编译器命令，徒劳地尝试提高可读性）：

Ld /Users/brennon/Library/Developer/Xcode/DerivedData/BioAudio-avxobobusfxeffaswkzteodevihm/Build/Intermediates/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv7/BioAudio normal armv7
    cd /Users/brennon/Development/MobileMuse/BioAudio
    setenv IPHONEOS_DEPLOYMENT_TARGET 4.3
    setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2 
        -arch armv7 
        -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk 
        -L/Users/brennon/Library/Developer/Xcode/DerivedData/BioAudio-avxobobusfxeffaswkzteodevihm/Build/Products/Debug-iphoneos 
        -L/Users/brennon/Development/MobileMuse/BioAudio 
        -L/Users/brennon/Development/MobileMuse/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib 
        -F/Users/brennon/Library/Developer/Xcode/DerivedData/BioAudio-avxobobusfxeffaswkzteodevihm/Build/Products/Debug-iphoneos 
        -filelist /Users/brennon/Library/Developer/Xcode/DerivedData/BioAudio-avxobobusfxeffaswkzteodevihm/Build/Intermediates/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv7/BioAudio.LinkFileList 
        -dead_strip -miphoneos-version-min=4.3 -framework Foundation 
        -framework UIKit -framework CoreGraphics -framework AudioToolbox 
        -framework Security 
        -o /Users/brennon/Library/Developer/Xcode/DerivedData/BioAudio-avxobobusfxeffaswkzteodevihm/Build/Intermediates/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv7/BioAudio

我 仍在尝试链接 4.2 SDK，自从将我的开发机器升级到 10.7 并因此升级到 Xcode 后，该链接就不再存在了。我已经搜索了项目和目标设置，似乎找不到任何仍然指向 4.2 的内容。有什么想法吗？

编辑：我尝试了 dtuckernet 的答案。在项目目录中运行 grep -iRF iPhoneOS4.2.sdk . 会产生以下输出（很抱歉造成混乱！）：

./BioAudio.xcodeproj/project.pbxproj:                   "\"$(SRCROOT)/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib\"",
./BioAudio.xcodeproj/project.pbxproj:                   "\"$(SRCROOT)/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib\"",
./BioAudio.xcodeproj/project.xcworkspace/xcuserdata/brennon.xcuserdatad/UserInterfaceState.xcuserstate:         <string>file://localhost/Users/brennon/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a</string>
./BioAudio.xcodeproj/project.xcworkspace/xcuserdata/brennon.xcuserdatad/UserInterfaceState.xcuserstate:     <string>file://localhost/Users/brennon/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a</string>
./BioAudio.xcodeproj/project.xcworkspace/xcuserdata/brennon.xcuserdatad/UserInterfaceState.xcuserstate:     <string>Directory not found for option '-L/Users/brennon/Development/MobileMuse/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib'</string>
./build/BioAudio.build/Debug-iphoneos/BioAudio.build/build-state.dat:N/Users/brennon/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a
./build/BioAudio.build/Debug-iphoneos/BioAudio.build/build-state.dat:N/Users/brennon/Development/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a
./build/BioAudio.build/Debug-iphoneos/BioAudio.build/build-state.dat:lSLF07#2@121"Link /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv6/BioAudio3    /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk -L/Users/brennon/Development/BioAudio/build/Debug-iphoneos -L/Users/brennon/Development/BioAudio -L/Users/brennon/Development/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib -F/Users/brennon/Development/BioAudio/build/Debug-iphoneos -filelist /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv6/BioAudio.LinkFileList -dead_strip -miphoneos-version-min=4.2 -framework Foundation -framework UIKit -framework CoreGraphics -framework AudioToolbox -llo -framework Security -o /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphoneos/BioAudio.build/O0#ects-normal/armv6/BioAudio
./build/BioAudio.build/Debug-iphoneos/BioAudio.build/build-state.dat:lSLF07#2@121"Link /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv7/BioAudio3    /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk -L/Users/brennon/Development/BioAudio/build/Debug-iphoneos -L/Users/brennon/Development/BioAudio -L/Users/brennon/Development/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib -F/Users/brennon/Development/BioAudio/build/Debug-iphoneos -filelist /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv7/BioAudio.LinkFileList -dead_strip -miphoneos-version-min=4.2 -framework Foundation -framework UIKit -framework CoreGraphics -framework AudioToolbox -llo -framework Security -o /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphoneos/BioAudio.build/O0#ects-normal/armv7/BioAudio
Binary file ./build/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv6/BioAudio matches
Binary file ./build/BioAudio.build/Debug-iphoneos/BioAudio.build/Objects-normal/armv7/BioAudio matches
./build/BioAudio.build/Debug-iphonesimulator/BioAudio.build/build-state.dat:N/Users/brennon/Development/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a
./build/BioAudio.build/Debug-iphonesimulator/BioAudio.build/build-state.dat:old: warning: in /Users/brennon/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a, file was built for unsupported file format which is not the architecture being linked (i386)
./build/BioAudio.build/Debug-iphonesimulator/BioAudio.build/build-state.dat:lSLF07#2@90"Link /Users/brennon/Development/BioAudio/build/Debug-iphonesimulator/BioAudio.app/BioAudio318119306#318119307#0(372"ld: warning: in /Users/brennon/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a, file was built for unsupported file format which is not the architecture being linked (i3865(22@192"In /Users/brennon/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib/liblo.a, file was built for unsupported file format which is not the architecture being linked (i386)318119307#0#206#0(6@0"318119307#0#0#0#0#0"0(4@46""_lo_address_new_with_proto", referenced from:318119307#225#49#0(6@0"318119307#0#0#0#0#0"0(13@31"-[BioAudio setup] in BioAudio.o318119307#274#38#0(6@0"318119307#0#0#0#0#0"0(13@19"Symbol(s) not found318119307#312#24#0(6@0"318119307#0#0#0#0#0"0(13@35"Collect2: ld returned 1 exit status318119307#336#36#0(6@0"318119307#0#0#0#0#0"0(0#0#0"8640817536#1094"    cd /Use    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -L/Users/brennon/Development/BioAudio/build/Debug-iphonesimulator -L/Users/brennon/Development/BioAudio -L/Users/brennon/Development/BioAudio/../../Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/lib -F/Users/brennon/Development/BioAudio/build/Debug-iphonesimulator -filelist /Users/brennon/Development/BioAudio/build/BioAudio.build/Debug-iphonesimulator/BioAudio.build/Objects-normal/i386/BioAudio.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework CoreGraphics -framework AudioToolbox -llo -framework Security -o /Users/brennon/Developm1#t/BioAudio/build/Debug-iphonesimulator/BioAudio.app/BioAudio
Binary file ./build/Debug-iphoneos/BioAudio.app/BioAudio matches

将 pbproject.pbxproj 中的条目更改为 4.3 很简单，但是在构建时仍然会抛出相同的警告。清理仍然不能解决任何问题。我对仅更改 brennon.xcuerdatad 下 plist 中的 plist 键感到不安。我确定问题出在此处或 build-state 文件中，但这些文件不应该在干净的构建中刷新/重建吗？

Answer 1

您的项目设置中的某处仍然有对 4.2 的引用。过去，我使用 grep 来浏览项目中的所有文件并找到引用。请参阅此示例：

cd ~/Documents/MyProjectDirectory/
grep -iRF 4.2 .

这应该为您提供包含 4.2 的所有文件，并且应该很容易看到引用 4.2 SDK 的位置。

Answer 2

不同的配置调试/发布可能对目标 iOS 有不同的设置。检查您正在编译的配置是否符合您对应在其中设置的 iOS 的期望。