5f2cff973a
Fixes: https://bugs.busybox.net/show_bug.cgi?id=9756 Signed-off-by: Waldemar Brodkorb <wbx@openadk.org> [Thomas: rework patches as Git formatted patches, fix numbering.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
57 lines
2.3 KiB
Diff
57 lines
2.3 KiB
Diff
From dbb9ecfaac8db022292791936733e0841a0aa447 Mon Sep 17 00:00:00 2001
|
|
From: Alexey Neyman <stilor@att.net>
|
|
Date: Wed, 8 Feb 2017 16:00:57 -0200
|
|
Subject: [PATCH] sh: Fix building with gcc5/6
|
|
|
|
Build glibc for sh4-unknown-linux-gnu currently fails if one's
|
|
using GCC5/6: in dl-conflict.c, the elf_machine_rela() function
|
|
is called with NULL as its 3rd argument, sym. The implementation
|
|
of that function in sysdeps/sh/dl-machine.h dereferences that pointer:
|
|
|
|
const Elf32_Sym *const refsym = sym;
|
|
...
|
|
if (map == &GL(dl_rtld_map))
|
|
value -= map->l_addr + refsym->st_value + reloc->r_addend;
|
|
|
|
GCC discovers a null pointer dereference, and in accordance with
|
|
-fdelete-null-pointer-checks (which is enabled in -O2) replaces this
|
|
code with a trap - which, as SH does not implement a trap pattern in
|
|
GCC, evaluates to an abort() call. This abort() call pulls many more
|
|
objects from libc_nonshared.a, eventually resulting in link failure
|
|
due to multiple definitions for a number of symbols.
|
|
|
|
As far as I see, the conditional before this code is always false in
|
|
rtld: _dl_resolve_conflicts() is called with main_map as the first
|
|
argument, not GL(_dl_rtld_map), but since that call is in yet another
|
|
compilation unit, GCC does not know about it. Patch that wraps this
|
|
conditional into !defined RESOLVE_CONFLICT_FIND_MAP attached.
|
|
|
|
* sysdeps/sh/dl-machine.h (elf_machine_rela): The condition
|
|
in R_SH_DIR32 case is always false when inlined from
|
|
dl-conflict.c. Ifdef out to prevent GCC from insertin an
|
|
abort() call.
|
|
|
|
[Waldemar: backport of
|
|
https://sourceware.org/git/?p=glibc.git;a=commit;h=d40dbe722f004f999b589de776f7e57e564dda01.]
|
|
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
|
|
---
|
|
sysdeps/sh/dl-machine.h | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
diff --git a/sysdeps/sh/dl-machine.h b/sysdeps/sh/dl-machine.h
|
|
index 5bb37d0..6509055 100644
|
|
--- a/sysdeps/sh/dl-machine.h
|
|
+++ b/sysdeps/sh/dl-machine.h
|
|
@@ -389,7 +389,7 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
|
|
break;
|
|
case R_SH_DIR32:
|
|
{
|
|
-#ifndef RTLD_BOOTSTRAP
|
|
+#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
|
|
/* This is defined in rtld.c, but nowhere in the static
|
|
libc.a; make the reference weak so static programs can
|
|
still link. This declaration cannot be done when
|
|
--
|
|
2.7.4
|
|
|