Re: s_lock.h default definitions are rather confused

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: s_lock.h default definitions are rather confused
Date: 2015-01-12 17:57:25
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On 2015-01-10 23:03:36 +0100, Andres Freund wrote:
> On 2015-01-10 16:09:42 -0500, Tom Lane wrote:
> > I've not tried to build HEAD on my HPPA dinosaur for awhile, but I did
> > just now, and I am presented with boatloads of this:
> >
> > ../../../src/include/storage/s_lock.h:759: warning: `S_UNLOCK' redefined
> > ../../../src/include/storage/s_lock.h:679: warning: this is the location of the previous definition
> >
> > which is not too surprising because the "default" definition at line 679
> > precedes the HPPA-specific one at line 759.
> That's 0709b7ee72e4bc71ad07b7120acd117265ab51d0.
> Not too surprising that it broke and wasn't noticed without access to
> hppa - the hppa code uses gcc inline assembly outside of the big
> defined(__GNUC__) and inside the section headed "Platforms that use
> non-gcc inline assembly".
> > I'm not particularly interested in untangling the effects of the recent
> > hackery in s_lock.h enough to figure out how the overall structure got
> > broken, but I trust one of you will clean up the mess.
> I think it's easiest solved by moving the gcc inline assembly up to the
> rest of the gcc inline assembly. That'll require duplicating a couple
> lines, but seems easier to understand nonetheless. Not pretty.

Robert, do you have a better idea?

Alternatively we could just add a #undef in the hppa gcc section and
live with the uglyness.


Andres Freund

Andres Freund
PostgreSQL Development, 24x7 Support, Training & Services

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