From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Magnus Hagander <magnus(at)hagander(dot)net> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Michael Meskes <meskes(at)postgresql(dot)org> |
Subject: | Re: ECPG patch causes warning |
Date: | 2010-01-10 16:15:38 |
Message-ID: | 4415.1263140138@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Magnus Hagander <magnus(at)hagander(dot)net> writes:
> The ecpg patch at
> http://git.postgresql.org/gitweb?p=postgresql.git;a=commit;h=2f567552
> causes a compile warning on win64 (andi think win32, but I didn't
> recheck that). Specifically, line 140 of typename.c has:
> return (-type);
> Where type is of type Oid, which is unsigned.
I think that the compiler has caught an actual mistake here.
It looks to me like the patch is attempting to use a 'negative'
Oid to signal a problem, and that simply is going to break as soon
as the Oid counter runs past 2G. Perhaps InvalidOid is the thing
to use here? I did not look at the call sites though.
regards, tom lane
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