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Partial backport. Only the i686 piece is needed in glibc 2.17, and
the x86_64 piece doesn't apply anyway because we lack the multiarch
implementations present in upstream. Instead the the x86_64 piece
is fixed by glibc-rh1447808-2.patch.
commit e826574c985a15a500262f2fbd21c7e9259d3d11 (origin/master, origin/HEAD)
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Jun 12 15:00:33 2018 +0200
x86: Make strncmp usable from rtld
Due to the way the conditions were written, the rtld build of strncmp
ended up with no definition of the strncmp symbol at all: The
implementations were renamed for use within an IFUNC resolver, but the
IFUNC resolver itself was missing (because rtld does not use IFUNCs).
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Index: glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/strncmp-c.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/i686/multiarch/strncmp-c.c
+++ glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/strncmp-c.c
@@ -1,4 +1,4 @@
-#ifdef SHARED
+#if defined (SHARED) && IS_IN (libc)
# define STRNCMP __strncmp_ia32
# undef libc_hidden_builtin_def
# define libc_hidden_builtin_def(name) \