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

On 5/11/21 2:30 PM, Andrew Dunstan wrote:
> On 5/11/21 1:21 PM, Andres Freund wrote:
>> Hi,
>>
>> On 2021-05-11 10:52:22 -0400, Tom Lane wrote:
>>> Works for me.  One other thought --- do we care whether this works
>>> in a VPATH build, and if so does it?  The $< and $@ references should
>>> be OK, but I'm betting you need $(srcdir)/Gen_dummy_probes.pl.prolog
>>> or the like.
>> It doesn't work in a VPATH build right now, FWIW. $@, $< will point to a
>> local file in the build directory, right now. And the path to perltidyrc
>> doesn't work either. It seems to work after the following modifications
>>
>> diff --git i/src/backend/utils/Makefile w/src/backend/utils/Makefile
>> index bcf9dd41adf..ca733d12dce 100644
>> --- i/src/backend/utils/Makefile
>> +++ w/src/backend/utils/Makefile
>> @@ -92,10 +92,10 @@ $(top_builddir)/src/include/utils/probes.h: probes.h
>>  # Nothing depends on it, so it will never be called unless explicitly requested
>>  # The last two lines of the recipe format the script according to  our
>>  # standard and put back some blank lines for improved readability.
>> -Gen_dummy_probes.pl: Gen_dummy_probes.sed
>> +$(top_srcdir)/src/backend/utils/Gen_dummy_probes.pl: $(top_srcdir)/src/backend/utils/Gen_dummy_probes.sed
>>      perl -ni -e ' print; exit if /^\$$0/;' $@
>>      s2p -f $<  | sed -e 1,4d -e '/# #/d' -e '$$d' >> $@
>> -    perltidy --profile=../../tools/pgindent/perltidyrc $@
>> +    perltidy --profile=$(top_srcdir)/src/tools/pgindent/perltidyrc $@
>>      perl -pi -e '!$$lb && ( /^\t+#/  || /^# prototypes/ ) && print qq{\n};'\
>>          -e '$$lb = m/^\n/; ' $@
>>  
>
> Yeah, but this will create the perl file in the vpath directory where it
> won't ever be used anyway. You really want this back in the source
> directory where you can check it in etc.
>
> I came up with this:
>
>
> Gen_dummy_probes.pl: $(top_srcdir)/$(subdir)/Gen_dummy_probes.sed $(top_srcdir)/$(subdir)/Gen_dummy_probes.pl.prolog
>     cp $(top_srcdir)/$(subdir)/Gen_dummy_probes.pl.prolog $(top_srcdir)/$(subdir)/$@
>     s2p -f $<  | sed -e 1,3d -e '/# #/ d' -e '$$d' >> $(top_srcdir)/$(subdir)/$@
>     perltidy --profile=$(top_srcdir)/$(subdir)/../../tools/pgindent/perltidyrc $(top_srcdir)/$(subdir)/$@
>     perl -pi -e '!$$lb && ( /^\t+#/  || /^# prototypes/ ) && print qq{\n};'\
>         -e '$$lb = m/^\n/; ' $(top_srcdir)/$(subdir)/$@
>
>
> I'm not aware of any other case where we generate an in-tree file from a
> vpath, which is why it feels strange.



Simplified version:


Gen_dummy_probes.pl: $(srcdir)/Gen_dummy_probes.sed $(srcdir)/Gen_dummy_probes.pl.prolog
    cp $(srcdir)/Gen_dummy_probes.pl.prolog $(srcdir)/$@
    s2p -f $<  | sed -e 1,3d -e '/# #/ d' -e '$$d' >> $(srcdir)/$@
    perltidy --profile=$(srcdir)/../../tools/pgindent/perltidyrc $(srcdir)/$@
    perl -pi -e '!$$lb && ( /^\t+#/  || /^# prototypes/ ) && print qq{\n};'\
        -e '$$lb = m/^\n/; ' $(srcdir)/$@

cheers


andrew

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