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Re: RFC: ld.so: Add DT_FLAGS_2 and DF_2_GNU_IFUNC [BZ #20019]
On Fri, May 25, 2018 at 2:52 PM, Florian Weimer <fweimer@redhat.com> wrote:
> On 05/25/2018 10:26 PM, H.J. Lu wrote:
>>
>> +$(objpfx)tst-relocmod1b.so: $(objpfx)tst-relocmod1b.os \
>> + $(objpfx)tst-relocmod1a.so
>> + $(LINK.o) -nostdlib -nostartfiles -shared -o $@ -Wl,-z,now \
>> + $(filter-out $(shlib-lds),$^)
>
>
> Does this still link against libc.so.6? If not, then this is the bug.
It is not linked against libc.so.6 and it is done on purpose.
>
>> diff --git a/elf/tst-relocmod1a.c b/elf/tst-relocmod1a.c
>> new file mode 100644
>> index 0000000000..be9f8832b8
>> --- /dev/null
>> +++ b/elf/tst-relocmod1a.c
>> @@ -0,0 +1,23 @@
>> +/* Shared module to test for relocation over with IFUNC symbols.
>> + Copyright (C) 2018 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> +<http://www.gnu.org/licenses/>. */
>> +
>> +void
>> +bar (char *dst, const char *src, unsigned int size)
>> +{
>> + __builtin_memmove (dst, src, size);
>> +}
>
>
> What happens if you add an IFUNC resolver here? Doesn't the problem return
> as before?
https://sourceware.org/bugzilla/show_bug.cgi?id=23240
--
H.J.