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Re: RFC: ld.so: Add DT_FLAGS_2 and DF_2_GNU_IFUNC [BZ #20019]
- From: Florian Weimer <fweimer at redhat dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Fri, 25 May 2018 23:52:03 +0200
- Subject: Re: RFC: ld.so: Add DT_FLAGS_2 and DF_2_GNU_IFUNC [BZ #20019]
- References: <20180525202634.GA23760@intel.com>
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.
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?
Thanks,
Florian