问题
Here is the top of my source file:
#include <iostream>
#include <thread>
#include <fstream>
...
thread help(startHelp);
Where the thread is inside the function handleRequestsFromServer and startHelp is a void function.
When compiling this with g++ on Mac OS X 10.8.4, I get this error:
$ g++ diskutilityhelper.cpp -o run.out
diskutilityhelper.cpp:5:18: error: thread: No such file or directory
diskutilityhelper.cpp: In function ‘void handleRequestsFromServer()’:
diskutilityhelper.cpp:140: error: ‘thread’ was not declared in this scope
diskutilityhelper.cpp:140: error: expected `;' before ‘bomb’
I don't understand this error at all. Could anyone please help?
回答1:
You probably want to use Clang instead of GCC.
clang++ -std=c++11 -stdlib=libc++ diskutilityhelper.cpp -o run.out
All the options for GCC can be used with Clang, some are ignored. The above links to libc++, which is the preferred C++ standard library for Mac OS X with Clang (and a lot more complete than libstdc++ (even when considering the newest GCC).
As for the reason why this happens: my magic fortune telling ball tells me the g++ you are calling is an ancient GCC 4.2.1 Apple thingie, with that GCC's libstdc++, which has little to no C++11 support. Apple switched to Clang and it is now much preferred.
回答2:
The version of GCC shipped with XCode is very old. It doesn't support C++11.
You should compile your code using clang++ instead from the latest XCode version. That supports C++11 just fine (AFAIK). GCC is included in XCode mostly for compatibility purposes. The recommended compiler on OS X these days is Clang.
来源：https://stackoverflow.com/questions/17901797/c-compiler-not-finding-include-thread