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Re: modification time disorder: touch-related?


On 10/29/2010 12:24 AM, Oleksandr Gavenko wrote:
On 28.10.2010 20:10, Robert McDougall wrote:
In running Make, I find targets being remade that shouldn't have to be
remade; being considered younger than the prerequisites from which
they've just been made.  It seems to happen especially with
prerequisites created by `touch`:  e.g.:

     $ cat Makefile
     all : bar baz

     bar baz : foo
             cp $<  $@

     foo :
             touch $@

     $ rm foo bar baz
     $ make
     touch foo
     cp foo bar
     cp foo baz
     $ make
     cp foo bar
     cp foo baz
     $ make
     cp foo bar
     cp foo baz
     $ make
     cp foo bar
     cp foo baz
     $ make
     cp foo bar
     cp foo baz
     $ make
     cp foo bar
     $ make
     make: Nothing to be done for `all'.

Sleeping helps, but you have to sleep for quite a while; even 2 seconds
may not be enough:

do you build on FAT fs?

It knows by lesser time precision (exactly 2 sec).

Try example on NTFS.

If your files are on a server, of course, you need synchronization between the server and local system clocks, at least daily.

--
Tim Prince


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