Sync toplevel files from GCC.

/:
        Sync from GCC:

        2010-05-05  Sebastian Pop  <sebastian.pop@amd.com>
        * configure.ac: Allow all the versions greater than 0.10 of PPL.
        * configure: Regenerated.

        2010-04-20  Eric Botcazou  <ebotcazou@adacore.com>
        * configure.ac (BUILD_CONFIG): Redirect output to /dev/null.
        * configure: Regenerate.

        2010-04-17  Ralf Corsépius  <ralf.corsepius@rtems.org>
        * configure.ac (*-*-rtems*): Add target-libiberty to $skipdirs.
        * configure: Regenerate.

        2010-04-16  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
        * configure.ac: Check for elf_getshdrstrndx or elf_getshstrndx
        separately.
        * configure: Regenerate.

        2010-04-13  Steve Ellcey  <sje@cup.hp.com>
        * configure: Regenerate after change to elf.m4.

        2010-04-02  Sebastian Pop  <sebastian.pop@amd.com>
        * configure.ac: Add brackets around AC_TRY_COMPILE alternative.
        * configure: Regenerated.

        2010-04-02  Sebastian Pop  <sebastian.pop@amd.com>
        * configure.ac: Print "buggy but acceptable" when CLooG
        revision is less than 9.
        * configure: Regenerated.

config/:
        Sync from GCC:

        2010-04-13  Steve Ellcey  <sje@cup.hp.com>
        * elf.m4: Add hppa[12]*-*-hpux* to list of non-elf platforms.

        2010-01-05  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
        * stdint.m4 (GCC_HEADER_STDINT): Don't typedef uint8_t etc. if
        corresponding macros already exist.

bfd/:
        * configure: Regenerate.

ChangeLog

@@ -1,3 +1,36 @@
+2010-06-01  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
+	Sync from GCC:
+
+	2010-05-05  Sebastian Pop  <sebastian.pop@amd.com>
+	* configure.ac: Allow all the versions greater than 0.10 of PPL.
+	* configure: Regenerated.
+
+	2010-04-20  Eric Botcazou  <ebotcazou@adacore.com>
+	* configure.ac (BUILD_CONFIG): Redirect output to /dev/null.
+	* configure: Regenerate.
+
+	2010-04-17  Ralf Cors<E9>pius  <ralf.corsepius@rtems.org>
+	* configure.ac (*-*-rtems*): Add target-libiberty to $skipdirs.
+	* configure: Regenerate.
+
+	2010-04-16  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+	* configure.ac: Check for elf_getshdrstrndx or elf_getshstrndx
+	separately.
+	* configure: Regenerate.
+
+	2010-04-13  Steve Ellcey  <sje@cup.hp.com>
+	* configure: Regenerate after change to elf.m4.
+
+	2010-04-02  Sebastian Pop  <sebastian.pop@amd.com>
+	* configure.ac: Add brackets around AC_TRY_COMPILE alternative.
+	* configure: Regenerated.
+
+	2010-04-02  Sebastian Pop  <sebastian.pop@amd.com>
+	* configure.ac: Print "buggy but acceptable" when CLooG
+	revision is less than 9.
+	* configure: Regenerated.
+
 2010-05-26  Dave Korn  <dave.korn.cygwin@gmail.com>
 
 	Merge from gcc:

config/ChangeLog

@@ -1,3 +1,14 @@
+2010-06-01  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
+	Sync from GCC:
+
+	2010-04-13  Steve Ellcey  <sje@cup.hp.com>
+	* elf.m4: Add hppa[12]*-*-hpux* to list of non-elf platforms.
+
+	2010-01-05  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+	* stdint.m4 (GCC_HEADER_STDINT): Don't typedef uint8_t etc. if
+	corresponding macros already exist.
+
 2010-02-15  Nick Clifton  <nickc@redhat.com>
 
 	* elf.m4: Import from gcc mainline.

config/elf.m4

@@ -15,7 +15,7 @@ target_elf=no
 case $target in
   *-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
   *-msdosdjgpp* | *-netware* | *-vms* | *-wince* | *-*-pe* | \
-  alpha*-dec-osf* | *-interix*)
+  alpha*-dec-osf* | *-interix* | hppa[[12]]*-*-hpux*)
     target_elf=no
     ;;
   *)

config/stdint.m4

@@ -234,49 +234,61 @@ if test "$acx_cv_header_stdint" = stddef.h; then
     #define _UINT8_T
     #ifndef __uint8_t_defined
     #define __uint8_t_defined
+    #ifndef uint8_t
     typedef unsigned $acx_cv_type_int8_t uint8_t;
     #endif
     #endif
+    #endif
 
     #ifndef _UINT16_T
     #define _UINT16_T
     #ifndef __uint16_t_defined
     #define __uint16_t_defined
+    #ifndef uint16_t
     typedef unsigned $acx_cv_type_int16_t uint16_t;
     #endif
     #endif
+    #endif
 
     #ifndef _UINT32_T
     #define _UINT32_T
     #ifndef __uint32_t_defined
     #define __uint32_t_defined
+    #ifndef uint32_t
     typedef unsigned $acx_cv_type_int32_t uint32_t;
     #endif
     #endif
+    #endif
 
     #ifndef _INT8_T
     #define _INT8_T
     #ifndef __int8_t_defined
     #define __int8_t_defined
+    #ifndef int8_t
     typedef $acx_cv_type_int8_t int8_t;
     #endif
     #endif
+    #endif
 
     #ifndef _INT16_T
     #define _INT16_T
     #ifndef __int16_t_defined
     #define __int16_t_defined
+    #ifndef int16_t
     typedef $acx_cv_type_int16_t int16_t;
     #endif
     #endif
+    #endif
 
     #ifndef _INT32_T
     #define _INT32_T
     #ifndef __int32_t_defined
     #define __int32_t_defined
+    #ifndef int32_t
     typedef $acx_cv_type_int32_t int32_t;
     #endif
     #endif
+    #endif
 EOF
 elif test "$ac_cv_type_u_int32_t" = yes; then
   sed 's/^ *//' >> tmp-stdint.h <<EOF
@@ -296,25 +308,31 @@ elif test "$ac_cv_type_u_int32_t" = yes; then
     #define _UINT8_T
     #ifndef __uint8_t_defined
     #define __uint8_t_defined
+    #ifndef uint8_t
     typedef u_int8_t uint8_t;
     #endif
     #endif
+    #endif
 
     #ifndef _UINT16_T
     #define _UINT16_T
     #ifndef __uint16_t_defined
     #define __uint16_t_defined
+    #ifndef uint16_t
     typedef u_int16_t uint16_t;
     #endif
     #endif
+    #endif
 
     #ifndef _UINT32_T
     #define _UINT32_T
     #ifndef __uint32_t_defined
     #define __uint32_t_defined
+    #ifndef uint32_t
     typedef u_int32_t uint32_t;
     #endif
     #endif
+    #endif
 EOF
 else
   sed 's/^ *//' >> tmp-stdint.h <<EOF
@@ -364,9 +382,11 @@ elif test "$ac_cv_type_u_int64_t" = yes; then
     #define _UINT64_T
     #ifndef __uint64_t_defined
     #define __uint64_t_defined
+    #ifndef uint64_t
     typedef u_int64_t uint64_t;
     #endif
     #endif
+    #endif
 EOF
 elif test -n "$acx_cv_type_int64_t"; then
   sed 's/^ *//' >> tmp-stdint.h <<EOF
@@ -374,15 +394,19 @@ elif test -n "$acx_cv_type_int64_t"; then
     /* architecture has a 64-bit type, $acx_cv_type_int64_t */
     #ifndef _INT64_T
     #define _INT64_T
+    #ifndef int64_t
     typedef $acx_cv_type_int64_t int64_t;
     #endif
+    #endif
     #ifndef _UINT64_T
     #define _UINT64_T
     #ifndef __uint64_t_defined
     #define __uint64_t_defined
+    #ifndef uint64_t
     typedef unsigned $acx_cv_type_int64_t uint64_t;
     #endif
     #endif
+    #endif
 EOF
 else
   sed 's/^ *//' >> tmp-stdint.h <<EOF
@@ -392,13 +416,17 @@ else
     #ifndef _INT64_T
     #define _INT64_T
     #ifndef __int64_t_defined
+    #ifndef int64_t
     typedef long long int64_t;
     #endif
     #endif
+    #endif
     #ifndef _UINT64_T
     #define _UINT64_T
+    #ifndef uint64_t
     typedef unsigned long long uint64_t;
     #endif
+    #endif
 
     #elif defined __GNUC__ && defined (__STDC__) && __STDC__-0
     /* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and
@@ -410,24 +438,32 @@ else
 
     # ifndef _INT64_T
     # define _INT64_T
+    # ifndef int64_t
     __extension__ typedef long long int64_t;
     # endif
+    # endif
     # ifndef _UINT64_T
     # define _UINT64_T
+    # ifndef uint64_t
     __extension__ typedef unsigned long long uint64_t;
     # endif
+    # endif
 
     #elif !defined __STRICT_ANSI__
     # if defined _MSC_VER || defined __WATCOMC__ || defined __BORLANDC__
 
     #  ifndef _INT64_T
     #  define _INT64_T
+    #  ifndef int64_t
     typedef __int64 int64_t;
     #  endif
+    #  endif
     #  ifndef _UINT64_T
     #  define _UINT64_T
+    #  ifndef uint64_t
     typedef unsigned __int64 uint64_t;
     #  endif
+    #  endif
     # endif /* compiler */
 
     #endif /* ANSI version */
@@ -440,11 +476,15 @@ if test "$ac_cv_type_uintptr_t" != yes; then
 
     /* Define intptr_t based on sizeof(void*) = $ac_cv_sizeof_void_p */
     #ifndef __uintptr_t_defined
+    #ifndef uintptr_t
     typedef u$acx_cv_type_intptr_t uintptr_t;
     #endif
+    #endif
     #ifndef __intptr_t_defined
+    #ifndef intptr_t
     typedef $acx_cv_type_intptr_t  intptr_t;
     #endif
+    #endif
 EOF
 fi
 
@@ -496,16 +536,20 @@ if test "$ac_cv_type_uintmax_t" != yes; then
   sed 's/^ *//' >> tmp-stdint.h <<EOF
 
     /* Define intmax based on what we found */
+    #ifndef intmax_t
     #ifdef _INT64_T
     typedef int64_t       intmax_t;
     #else
     typedef long          intmax_t;
     #endif
+    #endif
+    #ifndef uintmax_t
     #ifdef _UINT64_T
     typedef uint64_t      uintmax_t;
     #else
     typedef unsigned long uintmax_t;
     #endif
+    #endif
 EOF
 fi
 

configure

@@ -3311,6 +3311,7 @@ case "${target}" in
     noconfigdirs="$noconfigdirs target-newlib target-libiberty target-libgloss ${libgcj} target-libmudflap"
     ;;
   *-*-rtems*)
+    skipdirs="${skipdirs} target-libiberty"
     noconfigdirs="$noconfigdirs target-libgloss ${libgcj}"
     ;;
     # The tpf target doesn't support gdb yet.
@@ -5493,7 +5494,8 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
   # Check for the recommended and required versions of GMP.
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for the correct version of gmp.h" >&5
 $as_echo_n "checking for the correct version of gmp.h... " >&6; }
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include "gmp.h"
 int
@@ -5511,8 +5513,7 @@ main ()
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <gmp.h>
 int
@@ -5800,8 +5801,6 @@ fi
 
 
 # Check for PPL
-ppl_major_version=0
-ppl_minor_version=10
 ppllibs=" -lppl_c -lppl -lgmpxx"
 pplinc=
 
@@ -5858,8 +5857,8 @@ fi
 if test "x$with_ppl" != "xno" -a "${ENABLE_PPL_CHECK}" = "yes"; then
   saved_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS $pplinc $gmpinc"
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for version $ppl_major_version.$ppl_minor_version of PPL" >&5
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for version 0.10 (or later revision) of PPL" >&5
-$as_echo_n "checking for version $ppl_major_version.$ppl_minor_version of PPL... " >&6; }
+$as_echo_n "checking for version 0.10 (or later revision) of PPL... " >&6; }
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include "ppl_c.h"
@@ -5867,7 +5866,7 @@ int
 main ()
 {
 
-  #if PPL_VERSION_MAJOR != $ppl_major_version || PPL_VERSION_MINOR != $ppl_minor_version
+  #if PPL_VERSION_MAJOR != 0 || PPL_VERSION_MINOR < 10
   choke me
   #endif
 
@@ -5970,9 +5969,30 @@ main ()
   return 0;
 }
 _ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include "cloog/cloog.h"
+int
+main ()
+{
+
+  #if CLOOG_VERSION_MAJOR != 0 || CLOOG_VERSION_MINOR != 15 || CLOOG_VERSION_REVISION < 9
+  choke me
+  #endif
+
+  ;
+  return 0;
+}
+_ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: buggy but acceptable" >&5
+$as_echo "buggy but acceptable" >&6; }
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }; clooglibs= ; clooginc=
@@ -6400,7 +6420,7 @@ target_elf=no
 case $target in
   *-darwin* | *-aix* | *-cygwin* | *-mingw* | *-aout* | *-*coff* | \
   *-msdosdjgpp* | *-netware* | *-vms* | *-wince* | *-*-pe* | \
-  alpha*-dec-osf* | *-interix*)
+  alpha*-dec-osf* | *-interix* | hppa[12]*-*-hpux*)
     target_elf=no
     ;;
   *)
@@ -6561,7 +6581,6 @@ main ()
       elf_nextscn (0, 0);
       elf_strptr (0, 0, 0);
       elf_getident (0, 0);
-      elf_getshdrstrndx (0, 0);
       elf_begin (0, 0, 0);
       elf_ndxscn (0);
       elf_end (0);
@@ -6581,6 +6600,61 @@ fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 
+    # Check for elf_getshdrstrndx or elf_getshstrndx.  The latter's flavor
+    # is determined in gcc/configure.ac.
+    if test x"$enable_lto" = x"yes" ; then
+      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for elf_getshdrstrndx" >&5
+$as_echo_n "checking for elf_getshdrstrndx... " >&6; }
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <libelf.h>
+int
+main ()
+{
+
+	elf_getshdrstrndx (0, 0);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; };
+	 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for elf_getshstrndx" >&5
+$as_echo_n "checking for elf_getshstrndx... " >&6; }
+         cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <libelf.h>
+int
+main ()
+{
+
+	   elf_getshstrndx (0, 0);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }; enable_lto=no; libelflibs= ; libelfinc=
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+    fi
+
     # If we couldn't enable LTO and the user forced it, emit an error.
     if test x"$enable_lto" = x"no" \
        && test x"$default_enable_lto" != x"yes" ; then
@@ -7619,7 +7693,7 @@ else
        mv conftest.o conftest.o.g0 &&
        ${CC} -c -g conftest.c &&
        mv conftest.o conftest.o.g &&
-       ${srcdir}/contrib/compare-debug conftest.o.g0 conftest.o.g; then
+       ${srcdir}/contrib/compare-debug conftest.o.g0 conftest.o.g > /dev/null 2>&1; then
       :
     else
       BUILD_CONFIG=

configure.ac

@@ -548,6 +548,7 @@ case "${target}" in
     noconfigdirs="$noconfigdirs target-newlib target-libiberty target-libgloss ${libgcj} target-libmudflap"
     ;;
   *-*-rtems*)
+    skipdirs="${skipdirs} target-libiberty"
     noconfigdirs="$noconfigdirs target-libgloss ${libgcj}"
     ;;
     # The tpf target doesn't support gdb yet.
@@ -1374,13 +1375,13 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
   #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,2,0)
   choke me
   #endif
-  ], AC_TRY_COMPILE([#include <gmp.h>],[
+  ], [AC_TRY_COMPILE([#include <gmp.h>],[
   #define GCC_GMP_VERSION_NUM(a,b,c) (((a) << 16L) | ((b) << 8) | (c))
   #define GCC_GMP_VERSION GCC_GMP_VERSION_NUM(__GNU_MP_VERSION,__GNU_MP_VERSION_MINOR,__GNU_MP_VERSION_PATCHLEVEL)
   #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,2)
   choke me
   #endif
-  ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])]),
+  ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])])],
    [AC_MSG_RESULT([no]); have_gmp=no])
 
   # If we have GMP, check the MPFR version.
@@ -1392,12 +1393,12 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
     #if MPFR_VERSION < MPFR_VERSION_NUM(2,3,1)
     choke me
     #endif
-    ], AC_TRY_COMPILE([#include <gmp.h>
+    ], [AC_TRY_COMPILE([#include <gmp.h>
     #include <mpfr.h>],[
     #if MPFR_VERSION < MPFR_VERSION_NUM(2,4,2)
     choke me
     #endif
-    ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])]),
+    ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])])],
      [AC_MSG_RESULT([no]); have_gmp=no])
   fi
 
@@ -1409,11 +1410,11 @@ if test -d ${srcdir}/gcc && test "x$have_gmp" = xno; then
     #if MPC_VERSION < MPC_VERSION_NUM(0,8,0)
     choke me
     #endif
-    ], AC_TRY_COMPILE([#include <mpc.h>],[
+    ], [AC_TRY_COMPILE([#include <mpc.h>],[
     #if MPC_VERSION < MPC_VERSION_NUM(0,8,1)
     choke me
     #endif
-    ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])]),
+    ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])])],
      [AC_MSG_RESULT([no]); have_gmp=no])
   fi
 
@@ -1530,8 +1531,6 @@ AC_ARG_WITH(boot-ldflags,
 AC_SUBST(poststage1_ldflags)
 
 # Check for PPL
-ppl_major_version=0
-ppl_minor_version=10
 ppllibs=" -lppl_c -lppl -lgmpxx"
 pplinc=
 
@@ -1572,9 +1571,9 @@ ENABLE_PPL_CHECK=yes)
 if test "x$with_ppl" != "xno" -a "${ENABLE_PPL_CHECK}" = "yes"; then
   saved_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS $pplinc $gmpinc"
-  AC_MSG_CHECKING([for version $ppl_major_version.$ppl_minor_version of PPL])
+  AC_MSG_CHECKING([for version 0.10 (or later revision) of PPL])
   AC_TRY_COMPILE([#include "ppl_c.h"],[
-  #if PPL_VERSION_MAJOR != $ppl_major_version || PPL_VERSION_MINOR != $ppl_minor_version
+  #if PPL_VERSION_MAJOR != 0 || PPL_VERSION_MINOR < 10
   choke me
   #endif
   ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]); ppllibs= ; pplinc= ; with_ppl=no ])
@@ -1637,7 +1636,12 @@ if test "x$with_cloog" != "xno" -a "${ENABLE_CLOOG_CHECK}" = "yes"; then
   #if CLOOG_VERSION_MAJOR != 0 || CLOOG_VERSION_MINOR != 15 || CLOOG_VERSION_REVISION < 5
   choke me
   #endif
-  ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]); clooglibs= ; clooginc= ])
+  ], [AC_TRY_COMPILE([#include "cloog/cloog.h"],[
+  #if CLOOG_VERSION_MAJOR != 0 || CLOOG_VERSION_MINOR != 15 || CLOOG_VERSION_REVISION < 9
+  choke me
+  #endif
+  ], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([buggy but acceptable])])],
+  [AC_MSG_RESULT([no]); clooglibs= ; clooginc= ])
   CFLAGS="$saved_CFLAGS"
 fi
 
@@ -1741,7 +1745,6 @@ ACX_ELF_TARGET_IFELSE([if test x"$enable_lto" = x"yes" ; then
       elf_nextscn (0, 0);
       elf_strptr (0, 0, 0);
       elf_getident (0, 0);
-      elf_getshdrstrndx (0, 0);
       elf_begin (0, 0, 0);
       elf_ndxscn (0);
       elf_end (0);
@@ -1750,6 +1753,27 @@ ACX_ELF_TARGET_IFELSE([if test x"$enable_lto" = x"yes" ; then
       [AC_MSG_RESULT([no]); enable_lto=no; libelflibs= ; libelfinc= ]
     )
 
+    # Check for elf_getshdrstrndx or elf_getshstrndx.  The latter's flavor
+    # is determined in gcc/configure.ac.
+    if test x"$enable_lto" = x"yes" ; then
+      AC_MSG_CHECKING([for elf_getshdrstrndx])
+      AC_TRY_LINK(
+        [#include <libelf.h>],[
+	elf_getshdrstrndx (0, 0);
+        ],
+        [AC_MSG_RESULT([yes]);],
+        [AC_MSG_RESULT([no]);
+	 AC_MSG_CHECKING([for elf_getshstrndx])
+         AC_TRY_LINK(
+           [#include <libelf.h>],[
+	   elf_getshstrndx (0, 0);
+           ],
+           [AC_MSG_RESULT([yes]);],
+           [AC_MSG_RESULT([no]); enable_lto=no; libelflibs= ; libelfinc= ]
+         )]
+      )
+    fi
+
     # If we couldn't enable LTO and the user forced it, emit an error.
     if test x"$enable_lto" = x"no" \
        && test x"$default_enable_lto" != x"yes" ; then
@@ -2723,7 +2747,7 @@ else
        mv conftest.o conftest.o.g0 &&
        ${CC} -c -g conftest.c &&
        mv conftest.o conftest.o.g &&
-       ${srcdir}/contrib/compare-debug conftest.o.g0 conftest.o.g; then
+       ${srcdir}/contrib/compare-debug conftest.o.g0 conftest.o.g > /dev/null 2>&1; then
       :
     else
       BUILD_CONFIG=