Date: Sat, 3 Nov 2018 18:11:19 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: Dimitry Andric <dim@FreeBSD.org> Cc: freebsd-hackers@FreeBSD.org Subject: Re: help with dl module and clang Message-ID: <08A14290-0A6E-4002-892E-D4254EB23076@cs.huji.ac.il> In-Reply-To: <2E58B6A3-B3E4-4266-9B40-5F3D64433460@cs.huji.ac.il> References: <4B8101F4-9A89-4486-8DF3-93DC799EF6D4@cs.huji.ac.il> <E3B4CDF3-2DE9-4785-963C-9158105C263E@FreeBSD.org> <2E58B6A3-B3E4-4266-9B40-5F3D64433460@cs.huji.ac.il>
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> On 3 Nov 2018, at 17:58, Daniel Braniss <danny@cs.huji.ac.il> wrote: >=20 >=20 >=20 >> On 3 Nov 2018, at 17:47, Dimitry Andric <dim@FreeBSD.org> wrote: >>=20 >> On 3 Nov 2018, at 15:51, Daniel Braniss <danny@cs.huji.ac.il> wrote: >>>=20 >>> I have a program that loads some modules via dlopen(), these = modules call some routines >>> which are in the main program, this works when using gcc, but with = cc it does not. >>>=20 >>> when compiling the main program I use -export-dynamic, and the = modules link fine when compiled with >>> gcc, but when compiling with clang/cc i get dlerror: ...Undefined = symbol =E2=80=A6 >>> BTW, when linking the main program with cc I get >>> /usr/bin/ld: warning: cannot find entry symbol xport-dynamic; = defaulting to 0000000000402140 >>=20 >> Instead of using -export-dynamic (which is a linker flag) as a flag = to >> cc, try using -Wl,-export-dynamic instead. Now, the linker = interprets >> this as the -e flag, which is something totally different. >>=20 >=20 > i had tried that before but i had -WI (upper case i) but re-reading = the manual > it should be-Wl (lower case l as in lima :-))!!!!! >=20 > thanks!!!!!! >=20 > and now have to try profiling (gprof) which started this mess, >=20 > thanks again!! >=20 > danny >=20 >=20 >> I think this will also help with the exporting of the symbols of your >> main program. >>=20 >> -Dimitry >>=20 >=20 ok, new problem, it also happens with gcc: when compiling the main program with flag -pg (gprof) dlopen fails with dlerror: Service unavailable what magic is needed now? danny > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to = "freebsd-hackers-unsubscribe@freebsd.org"
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