Re: Why do we have perl and sed versions of Gen_dummy_probes?

On 5/6/21 9:55 AM, Andrew Dunstan wrote:
> On 5/6/21 12:59 AM, Andres Freund wrote:
>> Hi,
>>
>> On 2021-05-06 00:18:12 -0400, Tom Lane wrote:
>>> Andres Freund <andres(at)anarazel(dot)de> writes:
>>>> I understand why we don't want to rely on sed because of windows - but
>>>> it's far from obvious why we can't just use the .pl variant all the
>>>> time?
>>> Perl is not considered a hard build requirement on non-Windows.
>> Oops, forgot that.
>>
>>
>>> We could dodge that by shipping a pre-built dummy probes.h,
>>> but that doesn't really seem like a cleaner way than what's
>>> there now.
>> I tried to regenerate Gen_dummy_probes.pl using s2p - which doesn't seem
>> to exist for modern versions of perl anymore :(
>>
>>
>>> Also, as I read it, Gen_dummy_probes.sed is useful in any case as
>>> being the "source code" for Gen_dummy_probes.pl. You'd need some
>>> other form of documentation if you removed it.
>
> I suggest we add a README that sets out
>
>
> a) why we do things this way
>
> b) that the sed script is what's authoritative
>
> c) how to regenerate the perl script if you change the sed script,
> including where to get s2p
>
>
> I can do that.
>
>

Here's a patch that adds the README and also adds a Makefile recipe for
regenerating Gen_dummy_probes.pl after the sed script is changed. On my
system at least the recipe is idempotent.

cheers

andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com