當從GCC 4.2切換到LLVM 2.0時，'-std ='中的值無效'

我想從使用GCC 4.2版改爲XCode4中的LLVM 2.0版。當我將編譯器標誌更改爲LLVM時，出現錯誤：'-std ='中的值無效。將它放在* _prefix.pch文件中，但是在關閉GCC_Precompile_prefix_header之後，錯誤移到了我的代碼中的一個新點。初始值使用似乎指的是一個空字符串。這裏發生了什麼事。當從GCC 4.2切換到LLVM 2.0時，'-std ='中的值無效'

完整的錯誤信息如下。非常感謝

CompileC /Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/Objects-normal/i386/GameViewController.o Classes/GameViewController.m normal i386 objective-c com.apple.compilers.llvm.clang.1_0.compiler 
    cd /Users/cram/Projects/MightyMemory 
    setenv LANG en_US.US-ASCII 
    setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/opt/local/bin:/usr/local/git/bin" 
    /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -x objective-c -arch i386 -fmessage-length=0 -fdiagnostics-print-source-range-info -fdiagnostics-show-category=id -fdiagnostics-parseable-fixits -std= -Wno-trigraphs -fpascal-strings -O0 -Wreturn-type -Wparentheses -Wswitch -Wno-unused-parameter -Wunused-variable -Wunused-value -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk -fexceptions -fasm-blocks -mmacosx-version-min=10.6 -gdwarf-2 -fvisibility=hidden -fobjc-abi-version=2 -fobjc-legacy-dispatch -D__IPHONE_OS_VERSION_MIN_REQUIRED=40000 -iquote /Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/MightyMemory-generated-files.hmap -I/Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/MightyMemory-own-target-headers.hmap -I/Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/MightyMemory-all-target-headers.hmap -iquote /Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/MightyMemory-project-headers.hmap -I/Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Products/Debug-iphonesimulator/include -I/Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/DerivedSources/i386 -I/Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/DerivedSources -F/Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Products/Debug-iphonesimulator -include /Users/cram/Projects/MightyMemory/MaxMemory_Prefix.pch -c /Users/cram/Projects/MightyMemory/Classes/GameViewController.m -o /Users/cram/Library/Developer/Xcode/DerivedData/MightyMemory-cceuiavwfpmibiczfvlodqgugfnb/Build/Intermediates/MightyMemory.build/Debug-iphonesimulator/MightyMemory.build/Objects-normal/i386/GameViewController.o 

error: invalid value '' in '-std='

來源

2011-06-09 cramhead

我解決了這個問題。對於下一個碰到這個問題的人：事實證明，傳遞給編譯器的選項是不正確的;並不是說我使用gcc時改變了它們。錯誤在於沒有設置GCC_C_LANGUAGE_STANDARD，即XCode4放置的參數是''（空白字符串）。我將它設置爲編譯器默認值，並且都很好。 – cramhead 2011-06-10 00:07:04

我解決了這個問題。對於下一個碰到這個問題的人來說：事實證明，傳遞給編譯器的選項是不正確的;並不是說我使用gcc時改變了它們。錯誤是沒有設置GCC_C_LANGUAGE_STANDARD，即XCode4放置的參數是''（空白字符串）。我將它設置爲編譯器默認值，並且都很好。

來源

2011-07-25 19:55:58 cramhead

當從GCC 4.2切換到LLVM 2.0時，'-std ='中的值無效'

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