* sysdeps/generic/ldsodefs.h (_dl_out_of_memory_internal): Remove decl.

	(_dl_out_of_memory): Use rtld_hidden_proto.
	* elf/dl-error.c (_dl_out_of_memory): Use rtld_hidden_data_def.
	(_dl_signal_error): Don't use INTUSE on _dl_out_of_memory.
	* elf/dl-open.c (_dl_open): Likewise.
	* elf/dl-deps.c (_dl_map_object_deps): Likewise.

	* sunrpc/des_impl.c (des_set_key): Make first argument unsigned char *.

	* elf/dl-addr.c (_dl_addr): Add a cast.

	* elf/unload3mod4.c: Declare foo.
	* elf/testobj2.c: Include <stdio.h>.

	* sysdeps/gnu/errlist.awk: Emit NERR macro for _sys_nerr_internal
	value constant, and use it in the defn.
	* sysdeps/gnu/errlist-compat.awk: Use NERR in array decl.
	Use actual size for compat array decls.

	* config.make.in (cc-mtune): New substituted variable.
	* configure.in (libc_cv_cc_mtune): New test for -mtune= switch,
	done only if libc_mtune_example is defined.
	* configure: Regenerated.
	* sysdeps/i386/configure.in (libc_mtune_example): Set it.
	* sysdeps/i386/configure: Regenerated.
	* sysdeps/i386/Makefile (CFLAGS-initfini.s): Use $(cc-mtune).

19 files changed, 149 insertions, 23 deletions

diff --git a/ChangeLog b/ChangeLog
index 445b3ad..1aea4bb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,32 @@
+2005-03-05  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/generic/ldsodefs.h (_dl_out_of_memory_internal): Remove decl.
+	(_dl_out_of_memory): Use rtld_hidden_proto.
+	* elf/dl-error.c (_dl_out_of_memory): Use rtld_hidden_data_def.
+	(_dl_signal_error): Don't use INTUSE on _dl_out_of_memory.
+	* elf/dl-open.c (_dl_open): Likewise.
+	* elf/dl-deps.c (_dl_map_object_deps): Likewise.
+
+	* sunrpc/des_impl.c (des_set_key): Make first argument unsigned char *.
+
+	* elf/dl-addr.c (_dl_addr): Add a cast.
+
+	* elf/unload3mod4.c: Declare foo.
+	* elf/testobj2.c: Include <stdio.h>.
+
+	* sysdeps/gnu/errlist.awk: Emit NERR macro for _sys_nerr_internal
+	value constant, and use it in the defn.
+	* sysdeps/gnu/errlist-compat.awk: Use NERR in array decl.
+	Use actual size for compat array decls.
+
+	* config.make.in (cc-mtune): New substituted variable.
+	* configure.in (libc_cv_cc_mtune): New test for -mtune= switch,
+	done only if libc_mtune_example is defined.
+	* configure: Regenerated.
+	* sysdeps/i386/configure.in (libc_mtune_example): Set it.
+	* sysdeps/i386/configure: Regenerated.
+	* sysdeps/i386/Makefile (CFLAGS-initfini.s): Use $(cc-mtune).
+
 2005-03-05  Jakub Jelinek  <jakub@redhat.com>
 
 	* Makerules ($(inst_libdir)/libc.so): Use $(slibdir) instead of
diff --git a/config.make.in b/config.make.in
index 81cb95b..1115460 100644
--- a/config.make.in
+++ b/config.make.in
@@ -62,6 +62,7 @@ have-selinux = @have_selinux@
 have-cc-with-libunwind = @libc_cv_cc_with_libunwind@
 fno-unit-at-a-time = @fno_unit_at_a_time@
 bind-now = @bindnow@
+cc-mtune = @cc_mtune@
 
 static-libgcc = @libc_cv_gcc_static_libgcc@
 
diff --git a/configure b/configure
index 1e9e50c..f35641a 100755
--- a/configure
+++ b/configure
@@ -313,7 +313,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi bindnow force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os subdirs add_ons base_machine sysnames INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_initfinit_array libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup libc_cv_libgcc_s_suffix libc_cv_as_needed ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_have_initfini no_whole_archive exceptions LIBGD have_selinux EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script gnu_ld gnu_as elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES linux_doors mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi bindnow force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os subdirs add_ons base_machine sysnames INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_initfinit_array libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup libc_cv_libgcc_s_suffix libc_cv_as_needed ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_have_initfini no_whole_archive exceptions LIBGD have_selinux EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script gnu_ld gnu_as elf xcoff static shared pic_default cc_mtune profile omitfp bounded static_nss nopic_initfini DEFINES linux_doors mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
 ac_subst_files=''
 
 # Initialize some variables set by options.
@@ -7615,6 +7615,72 @@ echo "$as_me:$LINENO: result: $pic_default" >&5
 echo "${ECHO_T}$pic_default" >&6
 
 
+# This test comes after sysdeps configure fragments, so that they can
+# define the variable libc_mtune_example to tell us a valid -mtune=value
+# argument that we can test with.
+cc_mtune=-mcpu
+if test "x$libc_mtune_example" != x; then
+  echo "$as_me:$LINENO: checking if compiler supports -mtune option" >&5
+echo $ECHO_N "checking if compiler supports -mtune option... $ECHO_C" >&6
+if test "${libc_cv_cc_mtune+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+      libc_cv_cc_mtune=no
+    save_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -mtune=$libc_mtune_example"
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  libc_cv_cc_mtune=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
+echo "$as_me:$LINENO: result: $libc_cv_cc_mtune" >&5
+echo "${ECHO_T}$libc_cv_cc_mtune" >&6
+  if test "x$libc_cv_cc_mtune" = xyes; then
+    cc_mtune=-mtune
+  fi
+fi
+
 
 
 
@@ -8371,6 +8437,7 @@ s,@xcoff@,$xcoff,;t t
 s,@static@,$static,;t t
 s,@shared@,$shared,;t t
 s,@pic_default@,$pic_default,;t t
+s,@cc_mtune@,$cc_mtune,;t t
 s,@profile@,$profile,;t t
 s,@omitfp@,$omitfp,;t t
 s,@bounded@,$bounded,;t t
diff --git a/configure.in b/configure.in
index 11f78b0..6ec23d5 100644
--- a/configure.in
+++ b/configure.in
@@ -2116,6 +2116,22 @@ fi
 rm -f conftest.*])
 AC_SUBST(pic_default)
 
+# This test comes after sysdeps configure fragments, so that they can
+# define the variable libc_mtune_example to tell us a valid -mtune=value
+# argument that we can test with.
+AC_SUBST(cc_mtune)cc_mtune=-mcpu
+if test "x$libc_mtune_example" != x; then
+  AC_CACHE_CHECK(if compiler supports -mtune option, libc_cv_cc_mtune, [dnl
+    libc_cv_cc_mtune=no
+    save_CFLAGS="$CFLAGS"
+    CFLAGS="$CFLAGS -mtune=$libc_mtune_example"
+    AC_TRY_COMPILE(,,[libc_cv_cc_mtune=yes])
+  ])
+  if test "x$libc_cv_cc_mtune" = xyes; then
+    cc_mtune=-mtune
+  fi
+fi
+
 AC_SUBST(profile)
 AC_SUBST(omitfp)
 AC_SUBST(bounded)
diff --git a/elf/dl-addr.c b/elf/dl-addr.c
index c56736c..6bd7f7b 100644
--- a/elf/dl-addr.c
+++ b/elf/dl-addr.c
@@ -68,7 +68,8 @@ _dl_addr (const void *address, Dl_info *info,
 	  && match->l_type == lt_executable)
 	info->dli_fname = _dl_argv[0];
 
-      const ElfW(Sym) *symtab = D_PTR (match, l_info[DT_SYMTAB]);
+      const ElfW(Sym) *symtab
+	= (const ElfW(Sym) *) D_PTR (match, l_info[DT_SYMTAB]);
       const char *strtab = (const char *) D_PTR (match, l_info[DT_STRTAB]);
 
       ElfW(Word) strtabsize = match->l_info[DT_STRSZ]->d_un.d_val;
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index a1c16d7..a959930 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -1,5 +1,5 @@
 /* Load the dependencies of a mapped object.
-   Copyright (C) 1996-2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 1996-2003, 2004, 2005 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
@@ -307,7 +307,7 @@ _dl_map_object_deps (struct link_map *map,
 		      {
 			/* We are not interested in the error message.  */
 			assert (errstring != NULL);
-			if (errstring != INTUSE(_dl_out_of_memory))
+			if (errstring != _dl_out_of_memory)
 			  free ((char *) errstring);
 
 			/* Simply ignore this error and continue the work.  */
diff --git a/elf/dl-error.c b/elf/dl-error.c
index 0ef76c8..993b7c2 100644
--- a/elf/dl-error.c
+++ b/elf/dl-error.c
@@ -1,5 +1,5 @@
 /* Error handling for runtime dynamic linker.
-   Copyright (C) 1995-2002,2004 Free Software Foundation, Inc.
+   Copyright (C) 1995-2002,2004,2005 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
@@ -45,7 +45,7 @@ struct catch
    variable since we have to avoid freeing it and so have to enable
    a pointer comparison.  See below and in dlfcn/dlerror.c.  */
 const char _dl_out_of_memory[] = "out of memory";
-INTVARDEF(_dl_out_of_memory)
+rtld_hidden_data_def (_dl_out_of_memory)
 
 
 /* This points to a function which is called when an continuable error is
@@ -95,7 +95,7 @@ _dl_signal_error (int errcode, const char *objname, const char *occation,
 	{
 	  /* This is better than nothing.  */
 	  lcatch->objname = "";
-	  lcatch->errstring = INTUSE(_dl_out_of_memory);
+	  lcatch->errstring = _dl_out_of_memory;
 	}
       longjmp (lcatch->env, errcode ?: -1);
     }
diff --git a/elf/dl-open.c b/elf/dl-open.c
index 4de2072..f1fcfbc 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -618,7 +618,7 @@ no more namespaces available for dlmopen()"));
 	  memcpy (local_errstring, errstring, len_errstring);
 	}
 
-      if (errstring != INTUSE(_dl_out_of_memory))
+      if (errstring != _dl_out_of_memory)
 	free ((char *) errstring);
 
       assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
diff --git a/elf/testobj2.c b/elf/testobj2.c
index f00ba9f..7e4b610 100644
--- a/elf/testobj2.c
+++ b/elf/testobj2.c
@@ -1,5 +1,6 @@
 #include <dlfcn.h>
 #include <stdlib.h>
+#include <stdio.h>
 
 #include "testobj.h"
 
diff --git a/elf/unload3mod4.c b/elf/unload3mod4.c
index 4586ff7..52f808e 100644
--- a/elf/unload3mod4.c
+++ b/elf/unload3mod4.c
@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+extern int foo (int x);
+
 int
 bar (int x)
 {
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 90ccb1b..f3531e2 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,7 @@
+2005-03-05  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/i386/Makefile (CFLAGS-initfini.s): Use $(cc-mtune).
+
 2005-03-05  Jakub Jelinek  <jakub@redhat.com>
 
 	* sysdeps/powerpc/tcb-offsets.sym (thread_offsetof): Rework for GCC 4.
diff --git a/linuxthreads/sysdeps/i386/Makefile b/linuxthreads/sysdeps/i386/Makefile
index 418fa5c..70124b3 100644
--- a/linuxthreads/sysdeps/i386/Makefile
+++ b/linuxthreads/sysdeps/i386/Makefile
@@ -1,7 +1,7 @@
 ifeq ($(subdir),linuxthreads)
 # On i686 we must avoid generating the trampoline functions generated
 # to get the GOT pointer.
-CFLAGS-pt-initfini.s += -march=i386 -mcpu=i386
+CFLAGS-pt-initfini.s += -march=i386 $(cc-mtune)=i386
 
 # Most files must not be compiled without frame pointer since we need
 # the frame base address which is stored in %ebp unless the frame pointer
diff --git a/sunrpc/des_impl.c b/sunrpc/des_impl.c
index 702bd02..d0004b9 100644
--- a/sunrpc/des_impl.c
+++ b/sunrpc/des_impl.c
@@ -391,14 +391,14 @@ static const unsigned long des_skb[8][64] =
 static const char shifts2[16] =
 {0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0};
 
-static void des_set_key (char *, unsigned long *) internal_function;
+static void des_set_key (unsigned char *, unsigned long *) internal_function;
 static void des_encrypt (unsigned long *, unsigned long *, int)
      internal_function;
 int _des_crypt (char *, unsigned, struct desparams *);
 
 static void
 internal_function
-des_set_key (char *key, unsigned long *schedule)
+des_set_key (unsigned char *key, unsigned long *schedule)
 {
   register unsigned long c, d, t, s;
   register unsigned char *in;
@@ -406,7 +406,7 @@ des_set_key (char *key, unsigned long *schedule)
   register int i;
 
   k = (unsigned long *) schedule;
-  in = (unsigned char *) key;
+  in = key;
 
   c2l (in, c);
   c2l (in, d);
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 08039e1..a3cef20 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -694,10 +694,7 @@ extern char **_dl_argv_internal attribute_hidden
 
 /* The array with message we print as a last resort.  */
 extern const char _dl_out_of_memory[];
-#ifdef IS_IN_rtld
-/* XXX #ifdef should go away.  */
-extern const char _dl_out_of_memory_internal[] attribute_hidden;
-#endif
+rtld_hidden_proto (_dl_out_of_memory)
 
 /* Flag set at startup and cleared when the last initializer has run.  */
 extern int _dl_starting_up;
diff --git a/sysdeps/gnu/errlist-compat.awk b/sysdeps/gnu/errlist-compat.awk
index db827f3..f357232 100644
--- a/sysdeps/gnu/errlist-compat.awk
+++ b/sysdeps/gnu/errlist-compat.awk
@@ -90,7 +90,7 @@ END {
     n = vcount[old];
     printf "#if SHLIB_COMPAT (libc, %s, %s)\n", old, new;
     printf "# include <bits/wordsize.h>\n";
-    printf "extern const char *const __sys_errlist_%s[];\n", old;
+    printf "extern const char *const __sys_errlist_%s[%d];\n", old, n;
     printf "const int __sys_nerr_%s = %d;\n", old, n;
     printf "strong_alias (_sys_errlist_internal, __sys_errlist_%s)\n", old;
     printf "declare_symbol (__sys_errlist_%s, object, __WORDSIZE/8*%d)\n", \
@@ -99,7 +99,7 @@ END {
       old, old;
     printf "compat_symbol (libc, __sys_nerr_%s, sys_nerr, %s);\n", old, old;
 
-    printf "extern const char *const ___sys_errlist_%s[];\n", old;
+    printf "extern const char *const ___sys_errlist_%s[%d];\n", old, n;
     printf "extern const int __sys_nerr_%s;\n", old;
     printf "strong_alias (__sys_errlist_%s, ___sys_errlist_%s)\n", old, old;
     printf "strong_alias (__sys_nerr_%s, ___sys_nerr_%s)\n", old, old;
@@ -110,10 +110,11 @@ END {
   }
 
   printf "\
-extern const char *const __sys_errlist_internal[];\n\
+extern const char *const __sys_errlist_internal[NERR];\n\
 extern const int __sys_nerr_internal;\n\
 strong_alias (_sys_errlist_internal, __sys_errlist_internal)\n\
 strong_alias (_sys_nerr_internal, __sys_nerr_internal)\n\
+extern const char *const sys_errlist[NERR];\n\
 versioned_symbol (libc, _sys_errlist_internal, sys_errlist, %s);\n\
 versioned_symbol (libc, __sys_errlist_internal, _sys_errlist, %s);\n\
 versioned_symbol (libc, _sys_nerr_internal, sys_nerr, %s);\n\
diff --git a/sysdeps/gnu/errlist.awk b/sysdeps/gnu/errlist.awk
index 3f074ed..365ac81 100644
--- a/sysdeps/gnu/errlist.awk
+++ b/sysdeps/gnu/errlist.awk
@@ -1,4 +1,4 @@
-# Copyright (C) 1991-1999,2002,2004 Free Software Foundation, Inc.
+# Copyright (C) 1991-1999,2002,2004,2005 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
@@ -106,8 +106,9 @@ errnoh == 4 \
 END {
   print "  };";
   print "";
-  print "const int _sys_nerr_internal";
-  print "  = sizeof _sys_errlist_internal / sizeof _sys_errlist_internal [0];";
+  print "#define NERR \\";
+  print "  (sizeof _sys_errlist_internal / sizeof _sys_errlist_internal [0])";
+  print "const int _sys_nerr_internal = NERR;"
   print "";
   print "#if !defined NOT_IN_libc && !ERRLIST_NO_COMPAT";
   print "# include <errlist-compat.c>";
diff --git a/sysdeps/i386/Makefile b/sysdeps/i386/Makefile
index ece94f3..24d09c7 100644
--- a/sysdeps/i386/Makefile
+++ b/sysdeps/i386/Makefile
@@ -8,7 +8,7 @@ long-double-fcts = yes
 ifeq ($(subdir),csu)
 # On i686 we must avoid generating the trampoline functions generated
 # to get the GOT pointer.
-CFLAGS-initfini.s += -march=i386 -mcpu=i386
+CFLAGS-initfini.s += -march=i386 $(cc-mtune)=i386
 endif
 
 ifeq ($(subdir),gmon)
diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure
index d1d4dc1..ecba166 100755
--- a/sysdeps/i386/configure
+++ b/sysdeps/i386/configure
@@ -52,3 +52,6 @@ if test $libc_cv_cpp_asm_debuginfo = yes; then
 _ACEOF
 
 fi
+
+# Tell top-level configure to try -mtune=i386.
+libc_mtune_example=i386
diff --git a/sysdeps/i386/configure.in b/sysdeps/i386/configure.in
index 028e1ae..93b62b6 100644
--- a/sysdeps/i386/configure.in
+++ b/sysdeps/i386/configure.in
@@ -33,3 +33,6 @@ rm -f conftest*])AC_SUBST(libc_cv_cpp_asm_debuginfo)
 if test $libc_cv_cpp_asm_debuginfo = yes; then
   AC_DEFINE(HAVE_CPP_ASM_DEBUGINFO)
 fi
+
+# Tell top-level configure to try -mtune=i386.
+libc_mtune_example=i386