Date: Fri, 30 Nov 2007 19:02:01 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Alejandro Pulver <alepulver@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: dlopen: resolving external library symbols to calling program Message-ID: <20071130170201.GK83121@deviant.kiev.zoral.com.ua> In-Reply-To: <20071130132858.1e4290a0@deimos.mars.bsd> References: <20071130132858.1e4290a0@deimos.mars.bsd>
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--lRF4gxo9Z9M++D0O Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 30, 2007 at 01:28:58PM -0300, Alejandro Pulver wrote: > Hello. >=20 > When I was updating the games/deng port, I found it failed at runtime > with the following error: >=20 > % doomsday > While opening dynamic library > /usr/local/lib/libdropengl.so: > /usr/local/lib/libdropengl.so: Undefined symbol "ArgExists" > DD_InitDGL: Loading of libdropengl.so failed. > (null). >=20 > The function is defined in m_args.c which is included in both > "doomsday" and "libdropengl.so". But nm(1) reports it as undefined for > "libdropengl.so". Also, it is loaded with RTLD_NOW. >=20 > % nm `which doomsday` | grep ArgExists > 080d9ef0 T ArgExists You are looking at the wrong symbol table. ELF objects have the dynamic symbol table that is used during run-time linking, and symbol table used by the static linker ld. The former table is shown by nm -D. I suspect that you need to link the doomsday binary with the --export-dynamic flag. See the info ld for details. >=20 > % nm /usr/local/lib/libdropengl.so | grep ArgExists > U ArgExists >=20 > The files are linked with the "-flat namespace" and "-undefined > suppress" flags in Mac OS X (don't know if it's relevant here). >=20 > I think the simplest solution (if possible, of course) would be to make > dlopen() resolve these symbols to the main executable. I tried to do > this with RTLD_GLOBAL without success. >=20 > The port is available here (note that the application uses cmake to > build): > ftp://ftp.alepulver.com.ar/deng.tar.bz2 >=20 > If you need any other information just ask me. I will appreciate any > help. >=20 > Thanks and Best Regards, > Ale --lRF4gxo9Z9M++D0O Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFHUEIJC3+MBN1Mb4gRAuj7AJ4wvGFK6cliYiVXlq6aeVyZ2Bbl6wCfTB4C 4wXfAwP6uTV3+CIL8DxxnUQ= =aXCW -----END PGP SIGNATURE----- --lRF4gxo9Z9M++D0O--
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