Merge tag 'glibc-2.22' into baseline

The GNU C Library
=================

The GNU C Library version 2.22 is now available.

The GNU C Library is used as *the* C library in the GNU system and
in GNU/Linux systems, as well as many other systems that use Linux
as the kernel.

The GNU C Library is primarily designed to be a portable
and high performance C library.  It follows all relevant
standards including ISO C11 and POSIX.1-2008.  It is also
internationalized and has one of the most complete
internationalization interfaces known.

The GNU C Library webpage is at http://www.gnu.org/software/libc/

Packages for the 2.22 release may be downloaded from:
        http://ftpmirror.gnu.org/libc/
        http://ftp.gnu.org/gnu/libc/

The mirror list is at http://www.gnu.org/order/ftp.html

NEWS for version 2.22
=====================

* The following bugs are resolved with this release:

  438, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152, 14094,
  14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969, 16159, 16339,
  16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538, 16559, 16560,
  16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293, 17322, 17403,
  17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620, 17621, 17628,
  17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833, 17836, 17841,
  17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965, 17967, 17969,
  17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007, 18019, 18020,
  18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042, 18043, 18046,
  18047, 18049, 18068, 18080, 18093, 18100, 18104, 18110, 18111, 18116,
  18125, 18128, 18134, 18138, 18185, 18196, 18197, 18206, 18210, 18211,
  18217, 18219, 18220, 18221, 18234, 18244, 18245, 18247, 18287, 18319,
  18324, 18333, 18346, 18371, 18383, 18397, 18400, 18409, 18410, 18412,
  18418, 18422, 18434, 18444, 18457, 18468, 18469, 18470, 18479, 18483,
  18495, 18496, 18497, 18498, 18502, 18507, 18508, 18512, 18513, 18519,
  18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536,
  18539, 18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553, 18557,
  18558, 18569, 18583, 18585, 18586, 18592, 18593, 18594, 18602, 18612,
  18613, 18619, 18633, 18641, 18643, 18648, 18657, 18676, 18694, 18696.

* Cache information can be queried via sysconf() function on s390 e.g. with
  _SC_LEVEL1_ICACHE_SIZE as argument.

* A buffer overflow in gethostbyname_r and related functions performing DNS
  requests has been fixed.  If the NSS functions were called with a
  misaligned buffer, the buffer length change due to pointer alignment was
  not taken into account.  This could result in application crashes or,
  potentially arbitrary code execution, using crafted, but syntactically
  valid DNS responses.  (CVE-2015-1781)

* The time zone file parser has been made more robust against crafted time
  zone files, avoiding heap buffer overflows related to the processing of
  the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
  large time zone data files.  Overly long time zone specifiers in the TZ
  variable no longer result in stack overflows and crashes.

* A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
  for LD and GD on x86 and x86-64, has been implemented.  You will need
  binutils-2.24 or later to enable this optimization.

* Character encoding and ctype tables were updated to Unicode 7.0.0, using
  new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
  Hat).  These updates cause user visible changes, such as the fix for bug
  17998.

* CVE-2014-8121 The NSS backends shared internal state between the getXXent
  and getXXbyYY NSS calls for the same database, causing a denial-of-service
  condition in some applications.

* Added vector math library named libmvec with the following vectorized x86_64
  implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
  pow, powf.
  The library can be disabled with --disable-mathvec. Use of the functions is
  enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
  Shared library libmvec.so is linked in as needed when using -lm (no need to
  specify -lmvec explicitly for not static builds).
  Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.

* A new fmemopen implementation has been added with the goal of POSIX
  compliance. The new implementation fixes the following long-standing
  issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
  old implementation is still present for use be by existing binaries.

* The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
  releases.  It has been fixed to match 2.19 and older, but binaries built
  against 2.20 and 2.21 might need to be recompiled.  See BZ#18694.

* Port to Native Client running on ARMv7-A (--host=arm-nacl).
  Contributed by Roland McGrath (Google).

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

Adhemerval Zanella
Alan Modra
Alexandre Oliva
Andreas Schwab
Andrew Senkevich
Andriy Rysin
Arjun Shankar
Aurelien Jarno
Benno Schulenberg
Brad Hubbard
Carlos O'Donell
Chris Metcalf
Christian Schmidt
Chung-Lin Tang
Cong Wang
Cyril Hrubis
Daniel Marjamäki
David S. Miller
Dmitry V. Levin
Eric Rannaud
Evangelos Foutras
Feng Gao
Florian Weimer
Gleb Fotengauer-Malinovskiy
H.J. Lu
Igor Zamyatin
J William Piggott
James Cowgill
James Lemke
John David Anglin
Joseph Myers
Kevin Easton
Khem Raj
Leonhard Holz
Mark Wielaard
Marko Myllynen
Martin Galvan
Martin Sebor
Matthew Fortune
Mel Gorman
Mike Frysinger
Miroslav Lichvar
Nathan Lynch
Ondřej Bílka
Paul Eggert
Paul Pluzhnikov
Pavel Kopyl
Pravin Satpute
Rajalakshmi Srinivasaraghavan
Rical Jasan
Richard Henderson
Roland McGrath
Rüdiger Sonderfeld
Samuel Thibault
Siddhesh Poyarekar
Stefan Liebler
Steve Ellcey
Szabolcs Nagy
Torvald Riegel
Tulio Magno Quites Machado Filho
Vincent Bernat
Wilco Dijkstra
Yaakov Selkowitz
Zack Weinberg

1 files changed, 152 insertions, 224 deletions

diff --git a/configure.ac b/configure.ac
index f3dd87d912..7e9383a7f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,9 +50,18 @@ if test $host != $build; then
 fi
 AC_SUBST(cross_compiling)
 AC_PROG_CPP
+AC_CHECK_TOOL(READELF, readelf, false)
+
 # We need the C++ compiler only for testing.
 AC_PROG_CXX
-AC_CHECK_TOOL(READELF, readelf, false)
+# It's useless to us if it can't link programs (e.g. missing -lstdc++).
+AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
+AC_LANG_PUSH([C++])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+	       [libc_cv_cxx_link_ok=yes],
+	       [libc_cv_cxx_link_ok=no])
+AC_LANG_POP([C++])])
+AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
 
 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
   AC_MSG_ERROR([you must configure in a separate build directory])
@@ -151,18 +160,6 @@ AC_ARG_ENABLE([profile],
 	      [profile=$enableval],
 	      [profile=no])
 
-AC_ARG_ENABLE([oldest-abi],
-	      AC_HELP_STRING([--enable-oldest-abi=ABI],
-			     [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
-	      [oldest_abi=$enableval],
-	      [oldest_abi=no])
-if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
-  oldest_abi=default
-else
-  AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
-fi
-AC_SUBST(oldest_abi)
-
 AC_ARG_ENABLE([hardcoded-path-in-tests],
 	      AC_HELP_STRING([--enable-hardcoded-path-in-tests],
 			     [hardcode newly built glibc path in tests @<:@default=no@:>@]),
@@ -184,6 +181,7 @@ AC_ARG_ENABLE([lock-elision],
 			     [Enable lock elision for pthread mutexes by default]),
 	      [enable_lock_elision=$enableval],
 	      [enable_lock_elision=no])
+AC_SUBST(enable_lock_elision)
 if test "$enable_lock_elision" = yes ; then
   AC_DEFINE(ENABLE_LOCK_ELISION)
 fi
@@ -264,6 +262,13 @@ AC_ARG_ENABLE([all-warnings],
 	      [])
 AC_SUBST(all_warnings)
 
+AC_ARG_ENABLE([werror],
+	      AC_HELP_STRING([--disable-werror],
+			     [do not build with -Werror]),
+	      [enable_werror=$enableval],
+	      [enable_werror=yes])
+AC_SUBST(enable_werror)
+
 AC_ARG_ENABLE([multi-arch],
 	      AC_HELP_STRING([--enable-multi-arch],
 			     [enable single DSO with optimizations for multiple architectures]),
@@ -364,11 +369,10 @@ if test "$build_pt_chown" = yes; then
   AC_DEFINE(HAVE_PT_CHOWN)
 fi
 
-# The way shlib-versions is used to generate soversions.mk uses a
-# fairly simplistic model for name recognition that can't distinguish
-# i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a $host_os
-# of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
-# tell.  This doesn't get used much beyond that, so it's fairly safe.
+# The abi-tags file uses a fairly simplistic model for name recognition that
+# can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
+# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
+# This doesn't get used much beyond that, so it's fairly safe.
 case "$host_os" in
 linux*)
   ;;
@@ -377,6 +381,12 @@ gnu*)
   ;;
 esac
 
+AC_ARG_ENABLE([mathvec],
+	      [AS_HELP_STRING([--enable-mathvec],
+	      [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
+	      [build_mathvec=$enableval],
+	      [build_mathvec=notset])
+
 # We keep the original values in `$config_*' and never modify them, so we
 # can write them unchanged into config.make.  Everything else uses
 # $machine, $vendor, and $os, and changes them whenever convenient.
@@ -397,19 +407,6 @@ vendor=$config_vendor
 os=$config_os
 base_os=''
 
-# config.guess on some IBM machines says `rs6000' instead of `powerpc'.
-# Unify this here.
-if test "$machine" = rs6000; then
-  machine="powerpc"
-fi
-
-# Braindead PowerPC box with absolutely no FPU.
-case "$machine-$host_os" in
-  powerpc*-*soft)
-    with_fp=no
-    ;;
-esac
-
 submachine=
 AC_ARG_WITH([cpu],
 	    AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
@@ -421,12 +418,13 @@ AC_ARG_WITH([cpu],
   esac
 ])
 
+# An preconfigure script can set this when it wants to disable the sanity
+# check below.
+libc_config_ok=no
+
 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 
-# An add-on can set this when it wants to disable the sanity check below.
-libc_config_ok=no
-
 dnl Having this here, though empty, makes sure that if add-ons' fragments
 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 dnl our AC_OUTPUT will actually use it.
@@ -581,48 +579,10 @@ if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
   esac
 fi
 
-dnl We need to use [ and ] for other purposes for a while now.
-changequote(,)dnl
-# Expand the configuration machine name into a subdirectory by architecture
-# type and particular chip.  If an add-on configure fragment already set
-# base_machine, we don't change it.
-test -n "$base_machine" || case "$machine" in
-i[4567]86)	base_machine=i386 machine=i386/$machine ;;
-powerpc64*)	base_machine=powerpc machine=powerpc/powerpc64 ;;
-powerpc*)	base_machine=powerpc machine=powerpc/powerpc32 ;;
-s390)           base_machine=s390 machine=s390/s390-32 ;;
-s390x)          base_machine=s390 machine=s390/s390-64 ;;
-sh3*)		base_machine=sh machine=sh/sh3 ;;
-sh4*)		base_machine=sh machine=sh/sh4 ;;
-sparc | sparcv[67])
-		base_machine=sparc machine=sparc/sparc32 ;;
-sparcv8 | supersparc | hypersparc)
-		base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
-sparcv8plus | sparcv8plusa | sparcv9)
-		base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
-sparcv8plusb | sparcv9b)
-		base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
-sparcv9v)
-		base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
-sparcv9v2)
-		base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
-sparc64)
-		base_machine=sparc machine=sparc/sparc64 ;;
-sparc64b)
-		base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
-sparc64v)
-		base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
-sparc64v2)
-		base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
-*)		base_machine=$machine ;;
-esac
-changequote([,])dnl
+# Set base_machine if not set by a preconfigure fragment.
+test -n "$base_machine" || base_machine=$machine
 AC_SUBST(base_machine)
 
-if test "$base_machine" = "i386"; then
-  AC_DEFINE(USE_REGPARMS)
-fi
-
 # For the multi-arch option we need support in the assembler & linker.
 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 	       libc_cv_ld_gnu_indirect_function, [dnl
@@ -975,19 +935,18 @@ AC_PROG_LN_S
 
 LIBC_PROG_BINUTILS
 
-# Accept binutils 2.20 or newer.
+# Accept binutils 2.22 or newer.
 AC_CHECK_PROG_VER(AS, $AS, --version,
 		  [GNU assembler.* \([0-9]*\.[0-9.]*\)],
-		  [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
+		  [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+		  AS=: critic_missing="$critic_missing as")
 AC_CHECK_PROG_VER(LD, $LD, --version,
 		  [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
-		  [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
+		  [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+		  LD=: critic_missing="$critic_missing ld")
 
 # These programs are version sensitive.
 AC_CHECK_TOOL_PREFIX
-AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
-  [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
-  critic_missing="$critic_missing gcc")
 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
   [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
@@ -998,7 +957,7 @@ AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
   MSGFMT=: aux_missing="$aux_missing msgfmt")
 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
   [GNU texinfo.* \([0-9][0-9.]*\)],
-  [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
+  [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 AC_CHECK_PROG_VER(SED, sed, --version,
   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
@@ -1008,6 +967,16 @@ AC_CHECK_PROG_VER(AWK, gawk, --version,
   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
 
+AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
+AC_TRY_COMPILE([], [
+#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
+#error insufficient compiler
+#endif],
+	       [libc_cv_compiler_ok=yes],
+	       [libc_cv_compiler_ok=no])])
+AS_IF([test $libc_cv_compiler_ok != yes],
+      [critic_missing="$critic_missing compiler"])
+
 AC_CHECK_TOOL(NM, nm, false)
 
 if test "x$maintainer" = "xyes"; then
@@ -1099,29 +1068,6 @@ fi])
 AC_SUBST(libc_cv_gcc_static_libgcc)
 
 AC_PATH_PROG(BASH_SHELL, bash, no)
-if test "$BASH_SHELL" != no &&
-   $BASH_SHELL -c 'test "$BASH_VERSINFO" \
-	     && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
-  libc_cv_have_bash2=yes
-else
-  libc_cv_have_bash2=no
-fi
-AC_SUBST(libc_cv_have_bash2)
-
-dnl We need a ksh compatible shell for tzselect.
-if test "$BASH_SHELL" = no; then
-  AC_PATH_PROG(KSH, ksh, no)
-  if test "$KSH" = no; then
-    libc_cv_have_ksh=no
-  else
-    libc_cv_have_ksh=yes
-  fi
-else
-  KSH="$BASH_SHELL"
-  AC_SUBST(KSH)
-  libc_cv_have_ksh=yes
-fi
-AC_SUBST(libc_cv_have_ksh)
 
 AC_PATH_PROG(PERL, perl, no)
 if test "$PERL" != no &&
@@ -1130,7 +1076,10 @@ if test "$PERL" != no &&
 fi
 AC_PATH_PROG(INSTALL_INFO, install-info, no,
 	     $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
-AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
+AC_CHECK_PROG_VER(BISON, bison, --version,
+		  [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
+		  [2.7*|[3-9].*|[1-9][0-9]*],
+		  BISON=no)
 
 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
 AC_TRY_COMPILE(dnl
@@ -1278,6 +1227,29 @@ EOF
 fi
 
 if test $libc_cv_visibility_attribute = yes; then
+  AC_CACHE_CHECK(linker support for protected data symbol,
+		 libc_cv_protected_data,
+		 [cat > conftest.c <<EOF
+		  int bar __attribute__ ((visibility ("protected"))) = 1;
+EOF
+		  libc_cv_protected_data=no
+		  if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
+		    cat > conftest.c <<EOF
+		    extern int bar;
+		    int main (void) { return bar; }
+EOF
+		    if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
+		      libc_cv_protected_data=yes
+		    fi
+		  fi
+		  rm -f conftest.*
+		 ])
+else
+  libc_cv_protected_data=no
+fi
+AC_SUBST(libc_cv_protected_data)
+
+if test $libc_cv_visibility_attribute = yes; then
   AC_CACHE_CHECK(for broken __attribute__((visibility())),
 		 libc_cv_broken_visibility_attribute,
 		 [cat > conftest.c <<EOF
@@ -1415,73 +1387,6 @@ LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
 		    [libc_cv_z_initfirst=yes],
 		    [AC_MSG_ERROR(linker with -z initfirst support required)])
 
-# Add-on fragments can set these for other machines.
-libc_commonpagesize=${libc_commonpagesize:-no}
-libc_relro_required=${libc_relro_required:-no}
-case "$base_machine" in
-  i[[34567]]86 | x86_64 | powerpc* | s390*)
-    libc_commonpagesize=0x1000
-    libc_relro_required=yes
-    ;;
-  sparc*)
-    libc_commonpagesize=0x2000
-    libc_relro_required=yes
-    ;;
-esac
-
-if test $libc_commonpagesize != no; then
-  AC_CACHE_CHECK(for -z relro option,
-		 libc_cv_z_relro, [dnl
-  libc_cv_z_relro=no
-  AC_LANG_CONFTEST([AC_LANG_SOURCE([[
-int _start (void) { return 42; }
-extern void _exit (int);
-/* Since these pointers are const, they should go in rodata.
-   Since they refer to functions that have to be resolved by
-   dynamic linking, they should instead go in RELRO data.  */
-const void *const relro[] = { &_start, &_exit, 0 };
-/* GNU ld fails to produce RELRO data when it's very small and there is no
-   normal writable data following it, or if only uninitialized (.bss) data
-   follows it, or only very small writable data.  */
-int data[0x10000] = { 1, };
-]])])
-  cat > conftest.awk <<\EOF
-BEGIN {
-  result = "no"
-  commonpagesize = strtonum(commonpagesize)
-}
-{ print "LINE:", $0 > "/dev/stderr" }
-$1 == "GNU_RELRO" {
-  vaddr = strtonum($3)
-  memsz = strtonum($6)
-  end = vaddr + memsz
-  printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
-    vaddr, memsz, end, commonpagesize > "/dev/stderr"
-  result = (end % commonpagesize == 0) ? "yes" : "broken"
-}
-END { print result }
-EOF
-  AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-		    -fPIC -shared -o conftest.so conftest.c
-		    -nostartfiles -nostdlib
-		    -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
-  AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
-  AC_TRY_COMMAND([
-      $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
-	   conftest.ph > conftest.cps
-    ]) &&
-  libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
-  rm -f conftest*])
-  if { test "x$libc_relro_required" = xyes &&
-       test "x$libc_cv_z_relro" != xyes
-     }
-  then
-    AC_MSG_ERROR(linker with -z relro support required)
-  fi
-else
-  AC_MSG_WARN([missing architecture parameter to check for working -z relro])
-fi
-
 AC_CACHE_CHECK(for -Bgroup option,
 	       libc_cv_Bgroup, [dnl
 cat > conftest.c <<EOF
@@ -1756,30 +1661,6 @@ elif test $libc_cv_asm_weakext_directive = yes; then
   AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
 fi
 
-AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
-case $machine in
-  sparc/sparc64*) cfi_offset=2047;;
-  *) cfi_offset=0;;
-esac
-cat > conftest.s <<EOF
-	.text
-	.type   func,%function
-func:
-	.cfi_startproc
-	.cfi_remember_state
-	.cfi_rel_offset 1, $cfi_offset
-	.cfi_endproc
-EOF
-if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
-  libc_cv_asm_cfi_directives=yes
-else
-  libc_cv_asm_cfi_directives=no
-fi
-rm -f conftest*])
-if test $libc_cv_asm_cfi_directives = yes; then
-  AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
-fi
-
 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
 cat > conftest.c <<\EOF
 _start () {}
@@ -1819,18 +1700,6 @@ if test $libc_cv_gcc_exceptions = yes; then
 fi
 AC_SUBST(exceptions)dnl
 
-if test "$host_cpu" = powerpc ; then
-# Check for a bug present in at least versions 2.8.x of GCC
-# and versions 1.0.x of EGCS.
-AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
-AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
-	       libc_cv_c_asmcr0_bug='no',
-	       libc_cv_c_asmcr0_bug='yes')])
-if test "$libc_cv_c_asmcr0_bug" != 'no'; then
-  AC_DEFINE(BROKEN_PPC_ASM_CR0)
-fi
-fi
-
 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
 cat > conftest.c <<\EOF
 void zero (void *x)
@@ -1968,22 +1837,9 @@ else
   # See if we have the SELinux library
   AC_CHECK_LIB(selinux, is_selinux_enabled,
 	       have_selinux=yes, have_selinux=no)
-  # See if we have the SELinux header with the NSCD permissions in it.
-  if test x$have_selinux = xyes ; then
-    AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
-    AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
-		    [#ifdef NSCD__SHMEMHOST
-		     return 0;
-		     #else
-		     #error NSCD__SHMEMHOST not defined
-		     #endif],
-		    have_selinux=yes, have_selinux=no)
-    AC_MSG_RESULT($have_selinux)
-  fi
-
   if test x$with_selinux = xyes ; then
     if test x$have_selinux = xno ; then
-      AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
+      AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
     fi
   fi
 fi
@@ -2065,9 +1921,60 @@ esac],
 ])
 libc_extra_cflags=
 if test $libc_cv_predef_stack_protector = yes; then
-  libc_extra_cflags=-fno-stack-protector
+  libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
+fi
+libc_extra_cppflags=
+
+# Some linkers on some architectures support __ehdr_start but with
+# bugs.  Make sure usage of it does not create relocations in the
+# output (as the linker should resolve them all for us).
+AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
+	       libc_cv_ehdr_start, [
+old_CFLAGS="$CFLAGS"
+old_LDFLAGS="$LDFLAGS"
+old_LIBS="$LIBS"
+CFLAGS="$CFLAGS -fPIC"
+LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
+LIBS=
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+typedef struct {
+  char foo;
+  long val;
+} Ehdr;
+extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
+long ehdr (void) { return __ehdr_start.val; }
+])],
+	       [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
+		  libc_cv_ehdr_start=broken
+		else
+		  libc_cv_ehdr_start=yes
+		fi], [libc_cv_ehdr_start=no])
+CFLAGS="$old_CFLAGS"
+LDFLAGS="$old_LDFLAGS"
+LIBS="$old_LIBS"
+])
+if test "$libc_cv_ehdr_start" = yes; then
+  AC_DEFINE([HAVE_EHDR_START])
+elif test "$libc_cv_ehdr_start" = broken; then
+  AC_MSG_WARN([linker is broken -- you should upgrade])
+fi
+
+AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
+	       libc_cv_builtin_trap, [dnl
+libc_cv_builtin_trap=no
+AC_TRY_COMPILE([], [__builtin_trap ()], [
+libc_undefs=`$NM -u conftest.o |
+  LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
+    2>&AS_MESSAGE_LOG_FD` || {
+  AC_MSG_ERROR([confusing output from $NM -u])
+}
+echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
+if test -z "$libc_undefs"; then
+  libc_cv_builtin_trap=yes
+fi])])
+if test $libc_cv_builtin_trap = yes; then
+  AC_DEFINE([HAVE_BUILTIN_TRAP])
 fi
-AC_SUBST(libc_extra_cflags)
 
 ### End of automated tests.
 ### Now run sysdeps configure fragments.
@@ -2093,6 +2000,14 @@ for dir in $sysnames; do
   fi
 done
 
+if test x"$build_mathvec" = xnotset; then
+  build_mathvec=no
+fi
+LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
+
+AC_SUBST(libc_extra_cflags)
+AC_SUBST(libc_extra_cppflags)
+
 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
 fi
@@ -2160,6 +2075,19 @@ fi
 rm -f conftest.*])
 AC_SUBST(libc_cv_pic_default)
 
+AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
+[libc_cv_pie_default=yes
+cat > conftest.c <<EOF
+#if defined __PIE__ || defined __pie__ || defined PIE || defined pie
+# error PIE is default.
+#endif
+EOF
+if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
+  libc_cv_pie_default=no
+fi
+rm -f conftest.*])
+AC_SUBST(libc_cv_pie_default)
+
 AC_SUBST(profile)
 AC_SUBST(static_nss)