获取致命错误：找不到'type_traits'文件#include <type_traits>，同时构建铛示例

Question

我正在尝试从ngng构建PrintFunctionNames示例。 不过，我得到以下错误：

[mac-osx:clang/examples/PrintFunctionNames] osx% clang++ -std=c++0x PrintFunctionNames.cpp 
In file included from PrintFunctionNames.cpp:15: 
In file included from /usr/local/include/clang/Frontend/FrontendPluginRegistry.h:13: 
In file included from /usr/local/include/clang/Frontend/FrontendAction.h:22: 
In file included from /usr/local/include/clang/Basic/LLVM.h:22: 
In file included from /usr/local/include/llvm/Support/Casting.h:19: 
/usr/local/include/llvm/Support/type_traits.h:17:10: fatal error: 'type_traits' file not found 
#include <type_traits> 

系统信息：

铛版本4.0.0（http://llvm.org/git/clang.git 6197d01def79876e2c1670ced871e10b12c36241）（http://llvm.org/git/llvm.git 24f7cd87f70ddcc91d50f77e405420c0c27853fd） 目标：x86_64的 - 苹果darwin15.6.0 线程模型：POSIX InstalledDir：在/ usr/local/bin目录

OSX 10.11.6

编辑1：

关于作出亚历克斯建议的更改，我开始获取标题问题。通过包含修复它，同样的错误再次抛出

% clang++ -std=c++0x PrintFunctionNames.cpp -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -I../../../clang/include -I../../../../include -I../../../../../build/include 
In file included from PrintFunctionNames.cpp:15: 
In file included from ../../../clang/include/clang/Frontend/FrontendPluginRegistry.h:13: 
In file included from ../../../clang/include/clang/Frontend/FrontendAction.h:22: 
In file included from ../../../clang/include/clang/Basic/LLVM.h:22: 
In file included from ../../../../include/llvm/Support/Casting.h:19: 
../../../../include/llvm/Support/type_traits.h:17:10: fatal error: 'type_traits' file not found 
#include <type_traits> 
     ^
1 error generated. 

Answer 1

OS X（macOS）有一点不同的方法。你可以安装好几个Xcode，并为不同的平台编译。 您应该使用-isysroot选项来明确指定构建哪个SDK。

下面的命令应该做的伎俩

clang++ -std=c++0x PrintFunctionNames.cpp -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk 

否则，请检查所安装的SDK和改变isysroot值以符合您的设置。