On 2021/11/12 01:36, Mischa Baars wrote:
Hi All,
All of my makefiles only compile source files and link object files that
are NEW, as in the modification timestamp is newer than OR EQUAL TO the
access timestamp, such that when I include a new source file into a project
or produce a new object fi
On Thu, Nov 18, 2021 at 07:26:51AM +0100, Michael J. Baars wrote:
> So now we have a relation for 'older than' and for 'newer than', but how
> about 'oldest' (executable), and 'newest' (executable)?
https://mywiki.wooledge.org/BashFAQ/099
The bot in libera's #bash also has this factoid for it:
On Fri, 2021-11-12 at 19:48 +0100, Andreas Schwab wrote:
> FILE1 -nt FILE2 True if file1 is newer than file2 (according to
>modification date).
>
> Andreas.
>
So now we have a relation for 'older than' and for 'newer than', but how about
'oldest' (executable), and
On Wed, 2021-11-17 at 14:06 +0200, Ilkka Virta wrote:
> On Wed, Nov 17, 2021 at 1:33 PM Andreas Schwab wrote:
> > On Nov 17 2021, Michael J. Baars wrote:
> >
> >
> >
> > > When -N stands for NEW, and touch (-am) gives you a new file
> >
> >
> >
> > It doesn't. The file hasn't been modified
On 11/17/21 5:16 AM, Michael J. Baars wrote:
>> Why do you think `touch -am', which sets the atime and mtime to the same
>> value, should make -N true?
>
> When -N stands for NEW
It doesn't, though. It could just as easily be a mnemonic for "new activity
in the file." You're using it to mean `ne
On Wed, Nov 17, 2021 at 1:33 PM Andreas Schwab
wrote:
> On Nov 17 2021, Michael J. Baars wrote:
>
> > When -N stands for NEW, and touch (-am) gives you a new file
>
> It doesn't. The file hasn't been modified after it was last read.
>
touch creates the given file if it doesn't previously exist.
On Nov 17 2021, Michael J. Baars wrote:
> When -N stands for NEW, and touch (-am) gives you a new file
It doesn't. The file hasn't been modified after it was last read.
Andreas.
--
Andreas Schwab, sch...@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"
On Fri, 2021-11-12 at 19:48 +0100, Andreas Schwab wrote:
> FILE1 -nt FILE2 True if file1 is newer than file2 (according to
>modification date).
>
> Andreas.
>
This would indeed also solve the problem at hand :)
On Mon, 2021-11-15 at 09:23 -0500, Chet Ramey wrote:
> On 11/12/21 4:36 AM, Mischa Baars wrote:
>
> > Could you please restore the Fedora 32 behaviour? Someone must have read
> > the bash manual a little too precise, because now the statement only
> > returns true when a 'touch -a test' is given a
On 11/12/21 12:16 PM, Lawrence Velázquez wrote:
As I understand it, -N stands for NEW and therefore should return a true
when either a 'touch -a test' or a 'touch -am test' is given.
FWIW, there's some disagreement on this.
Not very much.
% cat foo_test
test -N foo
echo "$?"
On 11/12/21 4:36 AM, Mischa Baars wrote:
Could you please restore the Fedora 32 behaviour? Someone must have read
the bash manual a little too precise, because now the statement only
returns true when a 'touch -a test' is given and not when a 'touch -am
test' is given.
As I understand it, -N st
On Mon, Nov 15, 2021 at 5:21 AM Greg Wooledge wrote:
>relatime
> Update inode access times relative to modify or change
> time.
> Access time is only updated if the previous access time was
> ear‐
> lier than the current modify or change t
On Nov 14 2021, Greg Wooledge wrote:
> The significance of "setting the atime" will depend on the mount options
> of the file system in question. On Debian 11, a file system of type ext4
> which is mounted with "defaults" (as specified in fstab) includes the
> "relatime" option. Which is documen
On Sun, Nov 14, 2021 at 09:57:49PM -0500, Dale R. Worley wrote:
> One thing you have to worry about is how "touch" behaves, and whether
> *that* has changed between Fedora versions. I've run a few test uses of
> "touch" (in Fedora 34) and examined the consequences with "stat", and
> it's not clear
Mischa Baars writes:
> Using Fedora 32 (bash 5.0.17) this returns a true, while on Fedora 35 (bash
> 5.1.8) this returns a false:
> touch test; if [[ -N test ]]; then echo true; else echo false; fi;
Well, looking at the manual page, I see
-N file
True if file exists and
FILE1 -nt FILE2 True if file1 is newer than file2 (according to
modification date).
Andreas.
--
Andreas Schwab, sch...@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
On Fri, Nov 12, 2021 at 02:21:15PM +0100, Mischa Baars wrote:
> It is how my makefiles work :)
Then they aren't Makefiles. They're BaarsBuilder files or something.
> Do you realize how much time it takes to load the stat executable on all
> source files [...]
What the hell.
You're writing
Yeeh, that's funny indeed :)
Now this:
time ( test2Y=$(stat -c %Y test2); for (( i=0; i<1024; i++ )); do if (( $(stat
-c %Y test1) < ${test2Y} )); then echo >> /dev/null; else echo >> /dev/null; fi;
done; );
real0m4.503s
user0m1.048s
sys 0m3.240s
time ( for (( i=0; i<1024; i++ ));
On Fri, Nov 12, 2021, at 4:36 AM, Mischa Baars wrote:
> Using Fedora 32 (bash 5.0.17) this returns a true, while on Fedora 35 (bash
> 5.1.8) this returns a false:
> touch test; if [[ -N test ]]; then echo true; else echo false; fi;
>
> [...]
>
> As I understand it, -N stands for NEW and therefore s
On Fri, Nov 12, 2021 at 3:22 PM Mischa Baars
wrote:
> It is how my makefiles work :)
>
Sounds to me you're not using Make, but some self-made tool, so the files
you have would be more
properly called build scripts or whatever, and not makefiles.
i suggest a bash only makefile script then that spawns few instances of
whatever only, i do such whatever overall systems
a find printf to comparement is fairly fast, to estimate new files
then a good gcc in one cmd
done
On Fri, Nov 12, 2021, 14:22 Mischa Baars
wrote:
> Hi Greg,
>
> It is how my
Hi Greg,
It is how my makefiles work :)
Do you realize how much time it takes to load the stat executable on all
source files and object files? Conditional expressions are already in
memory. I prefer using the mtime field, the atime field and conditional
expressions.
Mischa.
On Fri, Nov 12, 20
On Fri, Nov 12, 2021 at 10:36:01AM +0100, Mischa Baars wrote:
> All of my makefiles only compile source files and link object files that
> are NEW, as in the modification timestamp is newer than OR EQUAL TO the
> access timestamp,
That's not how Makefiles work.
Makefiles compare the mtimes of two
> I agree that the `mtime >= atime' behavior should be restored; ``file
> is newly created or was accessed since last modified'' is not a useful
> information, nor is the opposite.
Or, -N can be split into -A (atime > mtime) and -M (mtime > atime),
and everyone would be happy :D
On Fri, Nov 12, 2021 at 12:44 PM Mischa Baars
wrote:
> Using Fedora 32 (bash 5.0.17) this returns a true, while on Fedora 35 (bash
> 5.1.8) this returns a false:
> touch test; if [[ -N test ]]; then echo true; else echo false; fi;
This seems to have changed as a result of this bug report:
https:/
On Nov 12 2021, Mischa Baars wrote:
> Using Fedora 32 (bash 5.0.17) this returns a true, while on Fedora 35 (bash
> 5.1.8) this returns a false:
> touch test; if [[ -N test ]]; then echo true; else echo false; fi;
What does `stat test' print respectively?
Andreas.
--
Andreas Schwab, sch...@lin
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