Default to --with-default-link=no (bug 25812)

This is necessary to place the libio vtables into the RELRO segment.
New tests elf/tst-relro-ldso and elf/tst-relro-libc are added to
verify that this is what actually happens.

The new tests fail on ia64 due to lack of (default) RELRO support
inbutils, so they are XFAILed there.

1 files changed, 1 insertions, 64 deletions

diff --git a/configure b/configure
index d2f413d..650bfd9 100755
--- a/configure
+++ b/configure
@@ -3375,7 +3375,7 @@ fi
 if test "${with_default_link+set}" = set; then :
   withval=$with_default_link; use_default_link=$withval
 else
-  use_default_link=default
+  use_default_link=no
 fi
 
 
@@ -6184,69 +6184,6 @@ fi
 $as_echo "$libc_cv_hashstyle" >&6; }
 
 
-# The linker's default -shared behavior is good enough if it
-# does these things that our custom linker scripts ensure that
-# all allocated NOTE sections come first.
-if test "$use_default_link" = default; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sufficient default -shared layout" >&5
-$as_echo_n "checking for sufficient default -shared layout... " >&6; }
-if ${libc_cv_use_default_link+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-    libc_cv_use_default_link=no
-  cat > conftest.s <<\EOF
-	  .section .note.a,"a",%note
-	  .balign 4
-	  .long 4,4,9
-	  .string "GNU"
-	  .string "foo"
-	  .section .note.b,"a",%note
-	  .balign 4
-	  .long 4,4,9
-	  .string "GNU"
-	  .string "bar"
-EOF
-  if { ac_try='  ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&5'
-  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; } &&
-       ac_try=`$READELF -S conftest.so | sed -n \
-	 '${x;p;}
-	  s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
-	  t a
-	  b
-	  : a
-	  H'`
-  then
-    libc_seen_a=no libc_seen_b=no
-    set -- $ac_try
-    while test $# -ge 2 -a "$1" = NOTE; do
-      case "$2" in
-      .note.a) libc_seen_a=yes ;;
-      .note.b) libc_seen_b=yes ;;
-      esac
-      shift 2
-    done
-    case "$libc_seen_a$libc_seen_b" in
-    yesyes)
-      libc_cv_use_default_link=yes
-      ;;
-    *)
-      echo >&5 "\
-$libc_seen_a$libc_seen_b from:
-$ac_try"
-      ;;
-    esac
-  fi
-  rm -f conftest*
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_use_default_link" >&5
-$as_echo "$libc_cv_use_default_link" >&6; }
-  use_default_link=$libc_cv_use_default_link
-fi
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GLOB_DAT reloc" >&5
 $as_echo_n "checking for GLOB_DAT reloc... " >&6; }
 if ${libc_cv_has_glob_dat+:} false; then :