From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: More bogus alignment assumptions |
Date: | 2001-03-25 21:41:40 |
Message-ID: | 200103252141.QAA17423@candle.pha.pa.us |
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Lists: | pgsql-hackers |
> Following up on the recent bug report from Steve Nicolai, I spent a
> tedious hour groveling through all the warnings emitted by gcc with
> -Wcast-align. (We ought to try to reduce the number of them, but that's
> a task for another day.)
>
> I found seven places, in addition to the tuptoaster.c error originally
> identified by Steve, in which the code is assuming that a "char foo[N]"
> local variable will be aligned on better-than-char boundaries by the
> compiler. All were inserted since 7.0. All but one were inserted by
> Vadim in the new WAL code; the other one is in large-object support
> and is my fault :-(
>
> I will fix these shortly, but I wanted to raise a flag to people:
> don't do that. An array of X is not guaranteed to be aligned any
> better than an X is.
Added to TODO:
* Remove warnings created by -Wcast-align
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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