Bob Friesenhahn wrote: > On Wed, 21 Nov 2007, Harlan Stenn wrote: > > > > A variety of problems can crop up if one is "doing things" in an > > NFS-mounted filesystem and there is clock skew between the local machine > > (NFS client box) and the machine that hosts the actual filesystem (NFS > > server box). > > I suggest that you check out some cool software called xntp which can > help correct your clock skew problems. Good idea - thanks! Where might I learn more? More to the point, I'm discussion an issue separate from NTP. I am trying to *detect* an existing problem condition, not prevent the problem. > > If I am running a configure script and there is a clock skew problem, I > > would want to know this ASAP beacuse if the clock skew is not > > deliberate, I want to fix it Right Away. > > Which particular clock skew do you want to detect? > > * Clock skew to source directory > * Clock skew to build directory > * Clock skew to header files outside the source directory > * Clock skew to libraries outside the build directory > * Clock skew to temporary file directory (gasp!) > * Clock skew due to filesystem with 1 second time resolution > * Clock skew during build due to wandering clock > * Clock skew to parallel build machine > > All of these problems are possible. Some issues are seen by GNU make > and others are not. I *think* I'd be happy with 'clock skew in the build directory'. If there are ways to use the same core functionality to measure the other cases you metion, that would be great. > When my clocks are a bit off I have noticed that > GNU make sometimes intermittently complains due to the "wandering > clock" problem. I don't see 'wander' (case insensitive) in either the gmake 3.81 or 3.79.1 source trees. > If I am not imagining things, I have seen configure > complain about clock problems before so perhaps there is already a > sanity check in place. AM_SANITY_CHECK will test to see if a newly-created file is older than distributed files, but that is more of a system clock check than a clock skew check. H _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
