Re: Why doesn't Autotools makefile update Bash hash cache after install?

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On Tue, Jun 13, 2017 at 9:45 AM, Jeffrey Walton <noloader@xxxxxxxxx> wrote:
> On Tue, Jun 13, 2017 at 8:40 AM, Zack Weinberg <zackw@xxxxxxxxx> wrote:
>> On Tue, Jun 13, 2017 at 8:29 AM, Jeffrey Walton <noloader@xxxxxxxxx> wrote:
>>>
>>> Why does Autotools produce a makefile which does _not_ update the
>>> cache under Bash shells?
>>
>> It can't.  The rehash operation has to be done in the shell that is
>> the parent process of 'make install' (and any other shell processes
>> that are running at the time); there is no way for 'make install' to
>> do that.
>
> Thanks, makes sense.
>
> I understand its a bad interaction. Things should "just work", but
> they don't. Would you happen to know why Bash does not update on its
> own after a 'make install'?

How is Bash to know that some random command changed the contents of
the directories in PATH?  Nowadays, I suppose it could use
inotify/dnotify/whatever the current flavor of that is to find out,
but in the past there was no such mechanism.

zw

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