blocks|key|3019680|text|这通常只是由于主机和客户端计算机之间的时间不匹配造成的。您可以尝试使用ntp同步机器上的时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3019681|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Network_Time_Protocol^0|Z|3|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

This is usually simply due to mismatching times between your host and client machines. You can try to synchronize the times on your machines using <a href="http://en.wikipedia.org/wiki/Network_Time_Protocol" rel="nofollow">ntp</a>.

blocks|key|295720|text|根据user+m9dhatter+on+LinuxQuestions.org的说法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|295721|295722|+"make“使用文件的时间戳来确定它试图编译的文件是旧的还是新的。如果你的时钟坏了，它可能在编译时有问题。|blockquote|295723|295724|如果您试图修改另一台机器上的文件，并且将时钟时间提前几分钟，然后将它们传输到您的机器上，然后尝试编译，它可能会弹出一条警告，说明该文件是在将来修改过的。时钟可能会倾斜，或者类似的东西(记不住了)。您可以只将ls添加到有问题的文件，然后执行以下操作：|295725|#触摸|295726|entityMap|0|LINK|mutability|MUTABLE|url|http://www.linuxquestions.org/questions/linux-newbie-8/error-clock-skew-detected-make-may-be-incomplete-whats-wrong-125912/^0|2|10|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

According to <a href="http://www.linuxquestions.org/questions/linux-newbie-8/error-clock-skew-detected-make-may-be-incomplete-whats-wrong-125912/" rel="noreferrer">user m9dhatter on LinuxQuestions.org</a>:

<blockquote>
 "make" uses the time stamp of the file to determine if the file
 it is trying to compile is old or new. if your clock is bonked, it may have problems compiling.
 
 if you try to modify files at another machine with a clock time ahead by a few minutes and transfer them to your machine and then try to compile it may cough up a warning that says the file was modified from the future. clock may be skewed or something to that effect ( cant really remember ). you could just ls to the offending file and do this:
 
 #touch &lt;filename of offending file&gt;
</blockquote>

blocks|key|3234130|text|检查编译的结果是否比源文件旧，例如某些文件.c。上面的警告意味着文件的时间片段有些奇怪。可能大学服务器的系统时钟与您的时钟不同，例如您在下午1点推送修改日期为下午2点的文件。您可以通过键入date在控制台中查看时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3234131|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Make checks if the result of the compilation, e.g. somefile.o, is older than the source, e.g. somefile.c. The warning above means that something about the timestaps of the files is strange. Probably the system clocks of the University server differs from your clock and you e.g. push at 1 pm a file with modification date 2 pm. You can see the time at the console by typing date.

blocks|key|3019833|text|该消息通常表示某些文件的修改时间晚于当前系统时间。由于make通过检查源文件的修改时间是否晚于其目标文件来决定在执行增量构建时要编译哪些文件，因此这种情况可能会导致构建不必要的文件，或者更糟糕的是，不构建必要的文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3019834|但是，如果您正在从头开始构建(而不是进行增量构建)，您可能会忽略此警告，而不会产生任何后果。|3019835|entityMap^0|R|4|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

That message is usually an indication that some of your files have modification times later than the current system time. Since <code>make</code> decides which files to compile when performing an incremental build by checking if a source files has been modified more recently than its object file, this situation can cause unnecessary files to be built, or worse, necessary files to not be built.

However, if you are building from scratch (not doing an incremental build) you can likely ignore this warning without consequence.

blocks|key|3019859|text|通常，当在NFS装载的目录中构建，并且客户端和NFS服务器上的时钟不同步时，就会发生这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3019860|解决方案是在NFS服务器和所有客户端上运行NTP客户端。|3019861|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Typically this occurs when building in a NFS mounted directory, and the clocks on the client and the NFS server are out of sync.

The solution is to run an NTP client on both the NFS server and all clients.

blocks|key|295791|text|我在过去也有过这种情况--因为机器上的时钟已经出来了。请考虑设置NTP，以便所有计算机都有相同的时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|295792|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have had this in the past - due to the clocks being out on the machines. Consider setting up NTP so that all machines have the same time.

blocks|key|296492|text|简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296493|#+touch+filename|code-block|syntax|javascript|296494|一切都会好的。|296495|有关更多信息，请访问：http://embeddedbuzz.blogspot.in/2012/03/make-warning-clock-skew-detected-your.html|offset|length|296496|entityMap|0|LINK|mutability|MUTABLE|url|http://embeddedbuzz.blogspot.in/2012/03/make-warning-clock-skew-detected-your.html^0|0|0|0|B|2A|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Simple solution:

<pre><code># touch filename
</code></pre>

will do all OK.

For more info:
<a href="http://embeddedbuzz.blogspot.in/2012/03/make-warning-clock-skew-detected-your.html" rel="noreferrer">http://embeddedbuzz.blogspot.in/2012/03/make-warning-clock-skew-detected-your.html</a>

blocks|key|295811|text|解决方案是运行NTP客户端，只需运行以下命令即可|type|unstyled|depth|inlineStyleRanges|entityRanges|data|295812|#ntpdate+172.16.12.100|code-block|syntax|javascript|295813|172.16.12.100是ntp服务器|295814|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The solution is to run an NTP client , just run the command as below 

<pre><code>#ntpdate 172.16.12.100
</code></pre>

172.16.12.100 is the ntp server

blocks|key|3019941|text|更换计算机中的手表电池。当主板上看起来像硬币的电池需要更换时，我看到了这个错误消息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3019942|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Replace the watch battery in your computer. I have seen this error message when the coin looking battery on the motherboard was in need of replacement.

blocks|key|3019947|text|安装网络时间协议|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3019948|在服务器上的Samba+SMB+CIFS共享上运行make时，我也遇到了这种情况。持久的解决方案包括在服务器和客户端上安装ntp守护进程。(请注意，运行ntpdate并不能解决此问题。这只会暂时解决时间差，但不会在将来解决。)|offset|length|style|CODE|3019949|对于Ubuntu和Debian派生的系统，只需在命令行中键入以下行：|3019950|$+sudo+apt+install+ntp|code-block|syntax|javascript|3019951|此外，用户仍然需要在受影响的目录中发出一次(且仅一次)命令touch+*，以一劳永逸地纠正文件修改时间。|3019952|$+touch+*|3019953|有关ntp和ntpdate之间的差异的更多信息，请参阅：|3019954|3019955|Time+Synchronisation+with+NTP|unordered-list-item|3019956|How+To+Set+Up+Time+Synchronization+on+Ubuntu+16.04+|3019957|3019958|entityMap|0|LINK|mutability|MUTABLE|url|http://help.ubuntu.com/lts/serverguide/NTP.html|1|https://www.digitalocean.com/community/tutorials/how-to-set-up-time-synchronization-on-ubuntu-16-04^0|0|P|4|1P|3|24|7|0|0|0|T|7|0|0|2|3|6|7|0|0|0|T|0|0|0|1F|1|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1C|8|@$D|1D|E|1E|F|G]|$D|1F|E|1G|F|G]|$D|1H|E|1I|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1J|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1K|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1L|8|@$D|1M|E|1N|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1O|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|1P|8|@$D|1Q|E|1R|F|G]|$D|1S|E|1T|F|G]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]|$1|V|3|W|5|X|7|1V|8|@]|9|@$D|1W|E|1X|1|1Y]]|A|$]]|$1|Y|3|Z|5|X|7|1Z|8|@]|9|@$D|20|E|21|1|22]]|A|$]]|$1|10|3|-4|5|6|7|23|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|24|8|@]|9|@]|A|$]]]|12|$13|$5|14|15|16|A|$17|18]]|19|$5|14|15|16|A|$17|1A]]]]

<h1>Install the Network Time Protocol</h1>
This also happened to me when running <code>make</code> on a Samba SMB CIFS share on a server.
A durable solution consists in installing the <code>ntp</code> daemon on both the server and the client.
(Please, note that this problem is not solved by running <code>ntpdate</code>. This would resolve the time difference only temporarily, but not in the future.)
For Ubuntu and Debian-derived systems, simply type the following line at the command line:
<pre><code>$ sudo apt install ntp
</code></pre>
Moreover, one will still need to issue the command <code>touch *</code> once (and only once) in the affected directory to correct the file modification times once and for all.
<pre><code>$ touch *
</code></pre>
For more information about the differences between <code>ntp</code> and <code>ntpdate</code>, please refer to:
<ul>
<li><a href="http://help.ubuntu.com/lts/serverguide/NTP.html" rel="noreferrer">Time Synchronisation with NTP</a></li>
<li><a href="https://www.digitalocean.com/community/tutorials/how-to-set-up-time-synchronization-on-ubuntu-16-04" rel="noreferrer">How To Set Up Time Synchronization on Ubuntu 16.04 </a></li>
</ul>

blocks|key|3234279|text|这里的其他答案很好地解释了这个问题，所以我不在这里重复了。但是有一个解决方案可以解决这个问题，但还没有列出:只需运行make+clean，然后重新运行make。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3234280|让make删除任何已编译的文件将阻止make有任何文件来比较其时间戳，从而解决该警告。|3234281|entityMap^0|1M|A|23|4|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

The other answers here do a good job of explaining the issue, so I won't repeat that here. But there is one solution that can resolve it that isn't listed yet: simply run <code>make clean</code>, then rerun <code>make</code>.

Having make remove any already compiled files will prevent make from having any files to compare the timestamps of, resolving the warning.

blocks|key|293363|text|这事发生在我身上。这是因为我运行了make+-j+4，有些作业的完成顺序有误。在使用-j选项时，应该会出现此警告。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|293364|entityMap^0|H|9|16|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

This happened to me. It's because I ran <code>make -j 4</code> and some jobs finished out of order. This warning should be expected when using the <code>-j</code> option.

blocks|key|3019997|text|如果您有sudo权限，一种选择是同步系统时间|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3019998|sudo+date+-s+"$(wget+-qSO-+--max-redirect=0+google.com+2>&1+%7C+grep+Date:+%7C+cut+-d'+'+-f5-8)Z"|code-block|syntax|javascript|3019999|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

(Just in case anyone lands here)
If you have sudo rights one option is to synchronize the system time

<pre><code>sudo date -s "$(wget -qSO- --max-redirect=0 google.com 2&gt;&amp;1 | grep Date: | cut -d' ' -f5-8)Z"
</code></pre>

blocks|key|3234339|text|输入终端，它会解决这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3234340|find+.+-type+f+%7C+xargs+-n+5+touch

make+clean

clean|code-block|syntax|javascript|3234341|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

type in the terminal and it will solve the issue:
<pre><code>find . -type f | xargs -n 5 touch

make clean

clean
</code></pre>

I'm connected to my university's small Linux cluster via PuTTY and WinSCP, transferring files using the latter and compiling and running them with the former. My work so far has been performed in the university's labs, but today I have been doing some work at home that generated an interesting warning.

I uploaded an entire folder of stuff and, upon running the <code>make</code> command, I get this as the last line of output:

<blockquote>
 make: warning: Clock skew detected. Your build may be incomplete.
</blockquote>

The resulting binary works correctly, and there doesn't seem to be any other unexpected errors in the build process.

I seem to be able to trigger the error by building after uploading some new / replacement files (I edit everything locally then upload the new version), so I'm wondering if it's something just as simple as mismatched file modification times? Or something more concerning?

So, should I be worried? How do I fix/prevent this?

Compiling C++ on remote Linux machine - "clock skew detected" warning

服务器

Ubuntu

Debian

Linux

我通过PuTTY和WinSCP连接到我的大学的小型Linux集群，使用后者传输文件，并使用前者编译和运行它们。到目前为止，我的工作是在大学的实验室中完成的，但今天我在家里做了一些工作，这产生了一个有趣的警告。我上传了一个完整的文件夹，在运行make命令时，我得到以下输出的最后一行： make:警告:检测到时钟偏差。您的...

问在远程Linux机器上编译C++ -“检测到时钟偏差”警告
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在远程Linux机器上编译C++ -“检测到时钟偏差”警告EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在远程Linux机器上编译C++ -“检测到时钟偏差”警告
EN