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From: nathan@gcc.gnu.org To: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, hubbard@ilm.com, jyost@ilm.com, kainz@ilm.com, nathan@gcc.gnu.org Subject: Re: libstdc++/4993: dynamic_cast incorrectly returns 0 Date: Fri, 07 Dec 2001 13:50:00 -0000 [thread overview] Message-ID: <20011207215005.892.qmail@sources.redhat.com> (raw) Synopsis: dynamic_cast incorrectly returns 0 State-Changed-From-To: analyzed->closed State-Changed-By: nathan State-Changed-When: Fri Dec 7 13:50:04 2001 State-Changed-Why: User error. Not only must you specify RTDL_GLOBAL when loading the dso, you must export symbols from the main program. Do this by giving the -E (--export-dynamic) flag to the linker. (Remember to say -Wl,-E, as otherwise you'll get confused like I did for 30 seconds until you realise a naked -E means something else). Refer the ld's man page for the meaning of -E. I will prepare a FAQ patch describing this. I've also attached a sample program (taken from your bug report) which now prints the expected result. http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4993&database=gcc
next reply other threads:[~2001-12-07 21:50 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2001-12-07 13:50 nathan [this message] -- strict thread matches above, loose matches on Subject: below -- 2001-12-07 16:16 Florian Kainz 2001-12-07 13:56 nathan 2001-12-03 15:46 nathan 2001-12-03 15:42 nathan 2001-12-03 15:16 nathan 2001-12-03 15:10 nathan 2001-12-03 12:26 kainz
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