From: | "D'Arcy" "J(dot)M(dot)" Cain <darcy(at)druid(dot)net> |
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To: | tgl(at)sss(dot)pgh(dot)pa(dot)us (Tom Lane) |
Cc: | pgsql-hackers(at)postgresql(dot)org, reedstrm(at)wallace(dot)ece(dot)rice(dot)edu |
Subject: | Re: [HACKERS] Checking if a system is ELF |
Date: | 1999-07-28 16:16:09 |
Message-ID: | m119WNG-0000cIC@druid.net |
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Thread: | |
Lists: | pgsql-hackers |
Thus spake Tom Lane
> "D'Arcy" "J.M." Cain <darcy(at)druid(dot)net> writes:
> > So grep will find "__ELF__" in the output on druid proving that it is an
> > a.out system. On smaug, __ELF__ is defined as "1" so grep fails to find
> > the string "__ELF__" proving it to be an ELF system.
>
> Seems to me that this is a test for __ELF__ being defined, but not for
> exactly what it is defined as. Mightn't a non-ELF system define it as 0?
Hard to imagine. Pre-ELF systems wouldn't know about it one way or
another. However, it is certainly a theoretical possibility.
> Also, I think there are prefab test macros in Autoconf for checking
> whether a #define symbol exists ... you shouldn't have to do anything
> as grotty as writing out an explicit test program ...
This is why I didn't send in diffs. I don't know enough about autoconf.
Is anyone looking at this discussion planning to incorporate something?
--
D'Arcy J.M. Cain <darcy(at){druid|vex}.net> | Democracy is three wolves
http://www.druid.net/darcy/ | and a sheep voting on
+1 416 424 2871 (DoD#0082) (eNTP) | what's for dinner.
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