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Re: BUG #7588: pgsql 9.1 incompatible with zlib 1.27

From: John Marino <draco(at)marino(dot)st>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #7588: pgsql 9.1 incompatible with zlib 1.27
Date: 2012-10-07 22:08:04
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Lists: pgsql-bugs
On 10/7/2012 22:26, Tom Lane wrote:
> John Marino<draco(at)marino(dot)st>  writes:
>> Are you 100% sure that offsetof is evaluated at compile time?  Is this
>> not part of section 6.6 that I quoted earlier?
> My copy of C99 sayeth (in section 7.17)
>                 offsetof(type, member-designator)
>         which expands to an integer  constant  expression  that  has
>         type  size_t,  the value of which is the offset in bytes, to
>         the structure member (designated by member-designator), from
>         the  beginning  of  its structure (designated by type).
> If your version of gcc isn't treating it as an integer constant
> expression, you either have a bug in the compiler or a bug in your
> version of<stddef.h>.  And I will say once more that we have not
> encountered any other report of gcc having a problem with this code.
> 			regards, tom lane

Final follow-up:
The culprit was indeed an older offsetof macro.  I've committed a fix to 
the trunk of DragonFly:

Using the GCC builtin version of offsetof allows Postgresql 9.1.6 to 
build without the recently added patches.  I'm going to revert that 
commit as well.

Thanks for the pointers, Tom!


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