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Re: Q: How to #ifdef for dlopen() or a specific OS Version

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at>
Cc: "'pgsql-hackers(at)postgresql(dot)org'" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Q: How to #ifdef for dlopen() or a specific OS Version
Date: 2000-09-25 14:55:49
Message-ID: 24366.969893749@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> writes:
> For a patch to fix the AIX port I would like to differentiate
> Versions below 4.3 and above, or rather I would like to 
> differentiate whether -ldl has dlopen().

Checking the latter condition seems more robust.

It's not hard.  After configure.in's line

AC_CHECK_LIB(dl,       main)

you could add something like

AC_CHECK_LIB(dl, dlopen, [AC_DEFINE(HAVE_DLOPEN_IN_LIBDL)])

and make the corresponding addition to config.h.in and/or
Makefile.global.in, depending on whether you need access to this symbol
from C code, Makefiles, or both.

			regards, tom lane

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