Question

我想在XCode4中使用GCC 4.2版更改为LLVM 2.0版。当我将编译器标志更改为LLVM时，我收到一个错误：'-std ='中的值无效''。在* _prefix.pch文件中有它，但在关闭GCC_Precompile_prefix_header后，错误移动到我的代码中的新点。初始值使用似乎是指空字符串。这是怎么回事。

完整的错误消息如下。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='

Answer 1

我解决了这个问题。对于下一个遇到这种情况的人：事实证明传递给编译器的选项是不正确的;不是我改变了他们使用gcc时的情况。错误是未设置GCC_C_LANGUAGE_STANDARD，即XCode4放置的参数是''（空白字符串）。我把它设置为编译器默认值，一切都很好。

从GCC 4.2切换到LLVM 2.0时，'-std ='中的值无效''

1 个答案: