当从GCC 4.2切换到LLVM 2.0时，'-std ='中的值无效'

我想从使用GCC 4.2版改为XCode4中的LLVM 2.0版。当我将编译器标志更改为LLVM时，出现错误：'-std ='中的值无效。将它放在* _prefix.pch文件中，但是在关闭GCC_Precompile_prefix_header之后，错误移到了我的代码中的一个新点。初始值使用似乎指的是一个空字符串。这里发生了什么事。当从GCC 4.2切换到LLVM 2.0时，'-std ='中的值无效'

完整的错误信息如下。非常感谢

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='

来源

2011-06-09 cramhead

我解决了这个问题。对于下一个碰到这个问题的人：事实证明，传递给编译器的选项是不正确的;并不是说我使用gcc时改变了它们。错误在于没有设置GCC_C_LANGUAGE_STANDARD，即XCode4放置的参数是''（空白字符串）。我将它设置为编译器默认值，并且都很好。 – cramhead 2011-06-10 00:07:04

我解决了这个问题。对于下一个碰到这个问题的人来说：事实证明，传递给编译器的选项是不正确的;并不是说我使用gcc时改变了它们。错误是没有设置GCC_C_LANGUAGE_STANDARD，即XCode4放置的参数是''（空白字符串）。我将它设置为编译器默认值，并且都很好。

来源

2011-07-25 19:55:58 cramhead

当从GCC 4.2切换到LLVM 2.0时，'-std ='中的值无效'

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