[sr #110521] autom4te does not always update cache, breaks if change happens within 1 second

[Paul Eggert]

Update of sr #110521 (project autoconf):

                  Status:                    None => Done                   
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

Thanks for the bug report and fix. I installed the attached patches. The first
is Andreas's fix with somewhat-different commit message; the second contains
more documentation about this.

I wish Perl supported precise file timestamps but we gotta work with what we
have.

(file #51848, file #51849)
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Additional Item Attachment:

File name: 0001-Fix-bug-when-autom4te-updates-too-quickly.patch Size:1 KB
   
<https://file.savannah.gnu.org/file/0001-Fix-bug-when-autom4te-updates-too-quickly.patch?file_id=51848>

File name: 0002-Add-commentary-for-Time-HiRes-patches.patch Size:2 KB
   
<https://file.savannah.gnu.org/file/0002-Add-commentary-for-Time-HiRes-patches.patch?file_id=51849>



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