Date: Wed, 24 Feb 1999 19:20:22 -0800 (PST) From: John Polstra <jdp@polstra.com> To: damian@cablenet.net Cc: hackers@freebsd.org Subject: Re: Interesting ld.so bug Message-ID: <199902250320.TAA00439@vashon.polstra.com> In-Reply-To: <36D1AFBF.58BCFFEF@cablenet.net> References: <199902202154.OAA18160@usr08.primenet.com>
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In article <36D1AFBF.58BCFFEF@cablenet.net>,
Damian Hamill <damian@cablenet.net> wrote:
>
> I've recently installed version 3 on a system and upgraded to 3.1 and
> noticed dynamic loading strangeness too.
>
> The Apache port won't load dynamic modules as it can't resolve some of
> the undefined symbols from the module being loaded which are contained
> in the loading process, ap_make_sub_pool for example.
>
> Using dlsym(NULL,"symbol_name") in one of my own dynamically loaded
> modules fails to find "symbol_name" in the loading process, contrary to
> the man page and previous behaviour.
This has been answered in the mailing lists zillions of times. Your
port is out of date, I suspect. You have to add "--export-dynamic" to
the linker command line when building the main executable. All of the
ports have been updated to do that already, as far as I know.
> Similarly I find that I now don't need a leading underscore before
> the symbol name to resolve symbols in the module being loaded from
> the loading process, again contrary to the man page and previous
> behaviour.
You're right about the man page -- it's out of date. Thanks for
pointing that out. "Previous behavior" has actually accepted the
symbol with or without the underscore for probably close to a year by
now.
> Is this all part of the transition to elf ?
Yes.
> Do I need to add -elf to CFLAGS ?
No, it should already be the default on your system. Type
"objformat" and see what it says.
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Nobody ever went broke underestimating the taste of the American public."
-- H. L. Mencken
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