How to clear the warning about clock?

[pellyhawk]

While compiling a project with g++ or gcc, a warning often emerged. What does this warning mean and how to deal with it?


make: warning: Clock skew detected. Your build may be incomplete.


Thanks.

[dwhitney67]

Pretty much it means that you have source files or object files that have been moved from one system to another, where each system has a different time, and hence the files have a time-stamp that is in the "future" relative to the time of the destination system.

Make looks at the time-stamps of files, not their contents, to decide whether a file needs to be processed.

Fix your system time to be in sync with the other system (consider using NTP (http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch24_:_The_NTP_Server) on both systems), or after you have copied files from one system to another, "touch" them so that their time-stamps are updated to the destination system's time.

P.S. The files do not necessarily have to be moved from one system to another; their time-stamps can be adjusted manually as well. But typically the issue arises when files are copied.