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From: Oleksandr Gavenko <gavenko AT bifit DOT com DOT ua>
Subject: Re: modification time disorder: touch-related?
Date: Fri, 29 Oct 2010 10:24:45 +0300
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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.


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