std :: this_thread :: sleep_for()和GCC [英] std::this_thread::sleep_for() and GCC

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问题描述

当我尝试编译这个简单的程序:

When I try to compile this simple program:

#include<thread>

void f() {
  std::this_thread::sleep_for(std::chrono::seconds(3));
}

int main() {
  std::thread t(f);
  t.join();
}



with gcc version 4.4.3 on Ubuntu 10.04 (32 bit):

$ g++ -std=c++0x -pthread a.cpp -o a

我得到:

error: ‘sleep_for’ is not a member of ‘std::this_thread’

我在标题'thread'
sleep_for()受_GLIBCXX_USE_NANOSLEEP保护

I looked in header 'thread'.
sleep_for() is protected with _GLIBCXX_USE_NANOSLEEP

#ifdef _GLIBCXX_USE_NANOSLEEP
...
/// sleep_for
template<typename _Rep, typename _Period>
  inline void
  sleep_for(const chrono::duration<_Rep, _Period>& __rtime)
...

为什么 _GLIBCXX_USE_NANOSLEEP 未定义?

如何获取此示例编译?

Why is _GLIBCXX_USE_NANOSLEEP not defined?
How do I get this example to compile?

更新2012年9月17日(jogojapan):今天我遇到了同样的问题,使用GCC 4.7。 1。我想知道是否有任何消息,如何避免它,除了通过定义 _GLIBCXX_USE_NANOSLEEP 。我尝试使用 -std = gnu11 ,但无效。

Update 17 Sep 2012 (jogojapan): I ran into this same problem today, using GCC 4.7.1. I wonder if there is any news on how to avoid it, other than by defining _GLIBCXX_USE_NANOSLEEP. I tried using -std=gnu11, but to no avail.

还有一个旧的,未解决的错误报告适用于GCC 4.4: https://bugs.launchpad.net/ubuntu/+source/gcc -4.4 / + bug / 608145

There is also an old, unresolved bug report for GCC 4.4: https://bugs.launchpad.net/ubuntu/+source/gcc-4.4/+bug/608145

2012年10月19日更新(jogojapan ):这个问题现在由Jonathan Wakely解释并解决了,作为这个问题的一个问题:什么是_GLIBCXX_USE_NANOSLEEP所有?
这对于那些自己编译GCC而不是使用现成的软件包的人来说尤其相关。

Update 19 Oct 2012 (jogojapan): The issue has now been explained and resolved by Jonathan Wakely as an anwer to this question: What is _GLIBCXX_USE_NANOSLEEP all about? This is particularly relevant for anyone who builds GCC himself instead of using a ready-made package.

推荐答案

确认它在这里也不工作。 (最近的GCC 4.6快照)。

Confirmed that it doesn't work here as well. (Recent GCC 4.6 snapshot).

你可以做明显的,简单地定义它,然后才包括任何std :: headers。有点脏,但会工作,直到GCC修复它(除非这是预期的行为)。 #define不应该打破任何东西。可以在source或-D_GLIBCXX_USE_NANOSLEEP标记到GCC。

You could do the obvious and simply define it before you include any std:: headers. A bit dirty but will work until GCC fixes it (unless this is intended behavior). The #define shouldn't break anything anyways. Either in source or -D_GLIBCXX_USE_NANOSLEEP flag to GCC.

您可能想尝试使用-std = gnu ++ 0x而不是-std = c ++ 0x,因为gnu ++ 0x经常拉这样的东西。

You might want to try using -std=gnu++0x rather than -std=c++0x, since gnu++0x often pulls in stuff like this.

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