Date: Sat, 3 Nov 2018 19:31:33 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Dimitry Andric <dim@FreeBSD.org>, freebsd-hackers@FreeBSD.org Subject: Re: help with dl module and clang Message-ID: <FA5207CF-3584-4D4E-A21F-AF76A0207729@cs.huji.ac.il> In-Reply-To: <20181103163508.GS5335@kib.kiev.ua> 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> <08A14290-0A6E-4002-892E-D4254EB23076@cs.huji.ac.il> <20181103163508.GS5335@kib.kiev.ua>
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> On 3 Nov 2018, at 18:35, Konstantin Belousov <kostikbel@gmail.com> =
wrote:
>=20
> On Sat, Nov 03, 2018 at 06:11:19PM +0200, Daniel Braniss wrote:
>>=20
>>=20
>>> 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:
>>=20
>> when compiling the main program with flag -pg (gprof)
>> dlopen fails with dlerror: Service unavailable
> This means that your binary is linked statically.
> dlopen(3) is not supported for static linking, ld-elf.so.1 is required
> for dynamic loading to work.
as far as I can tell, it=E2=80=99s NOT statically linked:
l
e-kots-b# ldd /vol/src/libexec/idng/idngd/idngd=20
/vol/src/libexec/idng/idngd/idngd:
libpq.so.5 =3D> /usr/local/lib/libpq.so.5 (0x800932000)
libcrypto.so.8 =3D> /lib/libcrypto.so.8 (0x800c00000)
libldap-2.4.so.2 =3D> /usr/local/lib/libldap-2.4.so.2 =
(0x801070000)
libthr.so.3 =3D> /lib/libthr.so.3 (0x8012b7000)
libintl.so.8 =3D> /usr/local/lib/libintl.so.8 (0x8014df000)
libssl.so.8 =3D> /usr/lib/libssl.so.8 (0x8016ea000)
libc.so.7 =3D> /lib/libc.so.7 (0x80195d000)
liblber-2.4.so.2 =3D> /usr/local/lib/liblber-2.4.so.2 =
(0x801d18000)
e-kots-b# file !$
file /vol/src/libexec/idng/idngd/idngd
/vol/src/libexec/idng/idngd/idngd: ELF 64-bit LSB executable, x86-64, =
version 1 (FreeBSD), dynamically linked, interpreter =
/libexec/ld-elf.so.1, for FreeBSD 11.2 (1102501 <tel:1102501>), =
FreeBSD-style, not stripped
>=20
>>=20
>> what magic is needed now?
>>=20
>> danny
>>=20
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>>=20
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