Merge GDB 7.5.1

libiberty/configure

 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.64.
 #
 # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
 # 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software
 # Foundation, Inc.
 #
 # This configure script is free software; the Free Software Foundation
 # gives unlimited permission to copy, distribute and modify it.
@@ skipping 3902 matching lines @@
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 ac_c_preproc_warn_flag=yes
 
 ac_libiberty_warn_cflags=
 save_CFLAGS="$CFLAGS"
-for option in -W -Wall -Wwrite-strings -Wc++-compat \
+for real_option in -W -Wall -Wwrite-strings -Wc++-compat \
                           -Wstrict-prototypes; do
+  # Do the check with the no- prefix removed since gcc silently
+  # accepts any -Wno-* option on purpose
+  case $real_option in
+    -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
+    *) option=$real_option ;;
+  esac
   as_acx_Woption=`$as_echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $option" >&5
 $as_echo_n "checking whether $CC supports $option... " >&6; }
 if { as_var=$as_acx_Woption; eval "test \"\${$as_var+set}\" = set"; }; then :
   $as_echo_n "(cached) " >&6
 else
   CFLAGS="$option"
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ skipping 11 matching lines @@
 else
   eval "$as_acx_Woption=no"
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 fi
 eval ac_res=\$$as_acx_Woption
                { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
   if test `eval 'as_val=${'$as_acx_Woption'};$as_echo "$as_val"'` = yes; then :
-  ac_libiberty_warn_cflags="$ac_libiberty_warn_cflags${ac_libiberty_warn_cflags:+ }$option"
+  ac_libiberty_warn_cflags="$ac_libiberty_warn_cflags${ac_libiberty_warn_cflags:+ }$real_option"
 fi
   done
 CFLAGS="$save_CFLAGS"
 
+# Do the check with the no- prefix removed from the warning options
+# since gcc silently accepts any -Wno-* option on purpose
 if test "$GCC" = yes; then :
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -pedantic " >&5
 $as_echo_n "checking whether $CC supports -pedantic ... " >&6; }
 if test "${acx_cv_prog_cc_pedantic_+set}" = set; then :
   $as_echo_n "(cached) " >&6
 else
   save_CFLAGS="$CFLAGS"
 CFLAGS="-pedantic "
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ skipping 881 matching lines @@
         PICFLAG=-fno-common
         ;;
     alpha*-dec-osf5*)
         # PIC is the default.
         ;;
     hppa*64*-*-hpux*)
         # PIC is the default for 64-bit PA HP-UX.
         ;;
     i[34567]86-*-cygwin* | i[34567]86-*-mingw* | x86_64-*-mingw*)
         ;;
-    i[34567]86-*-interix3*)
+    i[34567]86-*-interix[3-9]*)
         # Interix 3.x gcc -fpic/-fPIC options generate broken code.
         # Instead, we relocate shared libraries at runtime.
         ;;
     i[34567]86-*-nto-qnx*)
         # QNX uses GNU C++, but need to define -shared option too, otherwise
         # it will coredump.
         PICFLAG='-fPIC -shared'
         ;;
     i[34567]86-pc-msdosdjgpp*)
         # DJGPP does not support shared libraries at all.
@@ skipping 11 matching lines @@
         ;;
 
     # Some targets support both -fPIC and -fpic, but prefer the latter.
     # FIXME: Why?
     i[34567]86-*-* | x86_64-*-*)
         PICFLAG=-fpic
         ;;
     m68k-*-*)
         PICFLAG=-fpic
         ;;
-    s390*-*-*)
-        PICFLAG=-fpic
-        ;;
     # FIXME: Override -fPIC default in libgcc only?
     sh-*-linux* | sh[2346lbe]*-*-linux*)
         PICFLAG=-fpic
         ;;
     # FIXME: Simplify to sh*-*-netbsd*?
     sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
       sh64-*-netbsd* | sh64l*-*-netbsd*)
         PICFLAG=-fpic
         ;;
     # Default to -fPIC unless specified otherwise.
@@ skipping 1902 matching lines @@
 rm -f conftest.mmap
 
 fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working strncmp" >&5
 $as_echo_n "checking for working strncmp... " >&6; }
 if test "${ac_cv_func_strncmp_works+set}" = set; then :
   $as_echo_n "(cached) " >&6
 else
   if test "$cross_compiling" = yes; then :
-  ac_cv_func_strncmp_works=no
+  ac_cv_func_strncmp_works=yes
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
 /* Test by Jim Wilson and Kaveh Ghazi.
    Check whether strncmp reads past the end of its string parameters. */
 #include <sys/types.h>
 
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
@@ skipping 1428 matching lines @@
   exec 5>>config.log
   # Use ||, not &&, to avoid exiting from the if with $? = 1, which
   # would make configure fail if this is the last instruction.
   $ac_cs_success || as_fn_exit $?
 fi
 if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
 fi