| From: | Tim Bunce <Tim(dot)Bunce(at)pobox(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Tim Bunce <Tim(dot)Bunce(at)pobox(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Initial refactoring of plperl.c - updated |
| Date: | 2010-01-09 23:49:22 |
| Message-ID: | 20100109234922.GE2481@timac.local |
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| Thread: | |
| Lists: | pgsql-hackers |
On Sat, Jan 09, 2010 at 11:16:18PM +0200, Peter Eisentraut wrote:
> On fre, 2010-01-08 at 12:46 +0000, Tim Bunce wrote:
> > *** 45,50 ****
> > --- 45,55 ----
> >
> > include $(top_srcdir)/src/Makefile.shlib
> >
> > + plperl.o: perlchunks.h
> > +
> > + perlchunks.h: plc_*.pl
> > + $(PERL) text2macro.pl --strip='^(\#.*|\s*)$$' plc_*.pl >
> > perlchunks.htmp
> > + mv perlchunks.htmp perlchunks.h
> >
> > all: all-lib
>
> What's the reason for the temp file here?
Defensive. If the text2macro.pl program fails/dies then you'd be left
with a broken output file with a newer timestamp, so the next make
wouldn't rerun text2macro.pl.
Tim.
p.s. In the makefile for perl we use a little utility called mv_if_diff
instead of a plain mv so that any downstream dependencies only get
rebuilt if the contents have changed.
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