Re: [Dev-C++] compile warning??

[Per W. <pw...@ia...>]

Clock skew is when make builds a file just to find out that the created
output file has a time in the future. The most common cause is if you
build on one machine and the files are stored on another machine.

Make will then use the date/time of the build machine for deciding what to
do. However, for a lot of network file protocols it is the machine owning
the file system that sets the modify timestamp on the files. So if the
clock on the file server is in the future relative to the build machine,
this will happen.

For the reverse condition, i.e. build machine has time in future relative
to file server, make will sometime ignore building some files, since the
newly saved source files have a time stamp older than the corresponding
object file. However, for this case Make won't complain about clock skew -
it will not be able to detect the problem, resulting in incomplete
rebuilds.

Whenever doing network builds, it is imperative to keep the time on the
two machines synchronized, for example by letting both machines pick up
current time from a ntp time reference server.

/Per W

On Thu, 4 Nov 2004, Noorez Kassam wrote:

> [Warning] Clock skew detected. Your build may be incorrect.
>
> What is a clock skew...?
>
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