Merge GDB 7.5.1

libiberty/configure

Index: libiberty/configure
diff --git a/libiberty/configure b/libiberty/configure
index c798937deecfd8c6da2c634a9b5652fdb9b0004f..6e98352f356ffdc22ecdba010b6378a1d307b659 100755
--- a/libiberty/configure
+++ b/libiberty/configure
@@ -3920,8 +3920,14 @@ 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 $option" >&5
@@ -3953,11 +3959,13 @@ eval ac_res=\$$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 $CC supports -pedantic ... " >&6; }
@@ -4859,7 +4867,7 @@ case "${host}" in
 	;;
     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.
 	;;
@@ -4891,9 +4899,6 @@ case "${host}" in
     m68k-*-*)
 	PICFLAG=-fpic
 	;;
-    s390*-*-*)
-	PICFLAG=-fpic
-	;;
     # FIXME: Override -fPIC default in libgcc only?
     sh-*-linux* | sh[2346lbe]*-*-linux*)
 	PICFLAG=-fpic
@@ -6816,7 +6821,7 @@ if test "${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.  */