acinclude.m4: Use -Wl,-z,relro if possible.

2006-01-11  Benjamin Kosnik  <bkoz@redhat.com>

	* acinclude.m4: Use -Wl,-z,relro if possible.
	* configure: Regenerate.

From-SVN: r109618

3 files changed, 169 insertions, 1 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 9f5713e..a1e662c 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2006-01-11  Benjamin Kosnik  <bkoz@redhat.com>
+
+	* acinclude.m4: Use -Wl,-z,relro if possible.
+	* configure: Regenerate.
+
 2006-01-10  Paolo Carlini  <pcarlini@suse.de>
 
 	* include/tr1/complex: New file, hosts the additions to header
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 716dab5..6c84ca7 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -187,7 +187,7 @@ dnl safe (like an empty string).
 dnl
 dnl Defines:
 dnl  SECTION_LDFLAGS='-Wl,--gc-sections' if possible
-dnl  OPT_LDFLAGS='-Wl,-O1' if possible
+dnl  OPT_LDFLAGS='-Wl,-O1' and '-z,relro' if possible
 dnl  LD (as a side effect of testing)
 dnl Sets:
 dnl  with_gnu_ld
@@ -267,6 +267,19 @@ AC_DEFUN([GLIBCXX_CHECK_LINKER_FEATURES], [
     AC_MSG_RESULT($ac_sectionLDflags)
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    AC_MSG_CHECKING([for ld that supports -Wl,-z,relro])
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    AC_MSG_RESULT($ac_ld_relro)
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index b5fbb5b..bcd04af 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -8279,6 +8279,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -53103,6 +53118,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -74420,6 +74450,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -75900,6 +75945,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -77256,6 +77316,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -79399,6 +79474,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -80708,6 +80798,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -82066,6 +82171,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -83804,6 +83924,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
@@ -85875,6 +86010,21 @@ fi
 echo "${ECHO_T}$ac_sectionLDflags" >&6
   fi
 
+  # Set -z,relro.
+  # Note this is only for shared objects
+  ac_ld_relro=no
+  if test x"$with_gnu_ld" = x"yes"; then
+    echo "$as_me:$LINENO: checking for ld that supports -Wl,-z,relro" >&5
+echo $ECHO_N "checking for ld that supports -Wl,-z,relro... $ECHO_C" >&6
+    cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
+    if test -n "$cxx_z_relo"; then
+      OPT_LDFLAGS="-Wl,-z,relro"
+      ac_ld_relro=yes
+    fi
+    echo "$as_me:$LINENO: result: $ac_ld_relro" >&5
+echo "${ECHO_T}$ac_ld_relro" >&6
+  fi
+
   # Set linker optimization flags.
   if test x"$with_gnu_ld" = x"yes"; then
     OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"