diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 62d8bb907d..3809a42f6e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2008-10-02  Joel Brobecker  <brobecker@adacore.com>
+
+	* configure.ac: On alpha-osf, error out if enable_tui is set to
+	"yes", and set enable_tui to "no" if previously set to "auto".
+	Check for waddstr only if TUI support was requested. Move the
+	part of the configure script that updates various Makefile
+	variables up, together with the check for waddstr.
+	* configure: Regenerate.
+
 2008-10-22  Joel brobecker  <brobecker@adacore.com>
 
 	* gdbtypes.c (copy_type): New function.
diff --git a/gdb/configure b/gdb/configure
index 7f4d2a6d1e..c8fe9dae4a 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -10134,142 +10134,6 @@ done
 fi
 
 
-# For the TUI, we need enhanced curses functionality.
-#
-# FIXME: kettenis/20040905: We prefer ncurses over the vendor-supplied
-# curses library because the latter might not provide all the
-# functionality we need.  However, this leads to problems on systems
-# where the linker searches /usr/local/lib, but the compiler doesn't
-# search /usr/local/include, if ncurses is installed in /usr/local.  A
-# default installation of ncurses on alpha*-dec-osf* will lead to such
-# a situation.
-echo "$as_me:$LINENO: checking for library containing waddstr" >&5
-echo $ECHO_N "checking for library containing waddstr... $ECHO_C" >&6
-if test "${ac_cv_search_waddstr+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  ac_func_search_save_LIBS=$LIBS
-ac_cv_search_waddstr=no
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-/* Override any gcc2 internal prototype to avoid an error.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-/* We use char because int might match the return type of a gcc2
-   builtin and then its argument prototype would still apply.  */
-char waddstr ();
-int
-main ()
-{
-waddstr ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_search_waddstr="none required"
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-if test "$ac_cv_search_waddstr" = no; then
-  for ac_lib in ncurses cursesX curses; do
-    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
-    cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-/* Override any gcc2 internal prototype to avoid an error.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-/* We use char because int might match the return type of a gcc2
-   builtin and then its argument prototype would still apply.  */
-char waddstr ();
-int
-main ()
-{
-waddstr ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_search_waddstr="-l$ac_lib"
-break
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-  done
-fi
-LIBS=$ac_func_search_save_LIBS
-fi
-echo "$as_me:$LINENO: result: $ac_cv_search_waddstr" >&5
-echo "${ECHO_T}$ac_cv_search_waddstr" >&6
-if test "$ac_cv_search_waddstr" != no; then
-  test "$ac_cv_search_waddstr" = "none required" || LIBS="$ac_cv_search_waddstr $LIBS"
-
-fi
-
-
 # On HP/UX we may need libxpdl for dlgetmodinfo (used by solib-pa64.c).
 echo "$as_me:$LINENO: checking for library containing dlgetmodinfo" >&5
 echo $ECHO_N "checking for library containing dlgetmodinfo... $ECHO_C" >&6
@@ -10398,6 +10262,197 @@ if test "$ac_cv_search_dlgetmodinfo" != no; then
 fi
 
 
+# On alpha-osf, it appears that libtermcap and libcurses are not compatible.
+# There is a very specific comment in /usr/include/curses.h explaining that
+# termcap routines built into libcurses must not be used.
+#
+# The symptoms we observed so far is GDB unexpectedly changing
+# the terminal settings when tgetent is called - this is particularly
+# visible as the output is missing carriage returns, and so rapidly
+# becomes very hard to read.
+#
+# The readline configure script has already decided that libtermcap
+# was enough for its purposes, and so decided to build readline using
+# libtermcap.  Since the TUI mode requires curses, building GDB with
+# TUI enabled results in both libraries to be used at the same time,
+# which is not allowed.  This basically means that GDB with TUI is
+# broken on alpha-osf.
+
+case $host_os in
+  alpha*-*-osf* )
+    if "$enable_tui" = "yes"; then
+      { { echo "$as_me:$LINENO: error: Building GDB with TUI mode is not supported on this host" >&5
+echo "$as_me: error: Building GDB with TUI mode is not supported on this host" >&2;}
+   { (exit 1); exit 1; }; }
+    fi
+    if "$enable_tui" = "auto"; then
+      enable_tui=no
+    fi
+    ;;
+esac
+
+# Check whether we should enable the TUI, but only do so if we really
+# can.
+if test x"$enable_tui" != xno; then
+  if test -d $srcdir/tui; then
+    # For the TUI, we need enhanced curses functionality.
+    #
+    # FIXME: kettenis/20040905: We prefer ncurses over the vendor-supplied
+    # curses library because the latter might not provide all the
+    # functionality we need.  However, this leads to problems on systems
+    # where the linker searches /usr/local/lib, but the compiler doesn't
+    # search /usr/local/include, if ncurses is installed in /usr/local.  A
+    # default installation of ncurses on alpha*-dec-osf* will lead to such
+    # a situation.
+    echo "$as_me:$LINENO: checking for library containing waddstr" >&5
+echo $ECHO_N "checking for library containing waddstr... $ECHO_C" >&6
+if test "${ac_cv_search_waddstr+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+ac_cv_search_waddstr=no
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char waddstr ();
+int
+main ()
+{
+waddstr ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_search_waddstr="none required"
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+if test "$ac_cv_search_waddstr" = no; then
+  for ac_lib in ncurses cursesX curses; do
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char waddstr ();
+int
+main ()
+{
+waddstr ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_search_waddstr="-l$ac_lib"
+break
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+  done
+fi
+LIBS=$ac_func_search_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_search_waddstr" >&5
+echo "${ECHO_T}$ac_cv_search_waddstr" >&6
+if test "$ac_cv_search_waddstr" != no; then
+  test "$ac_cv_search_waddstr" = "none required" || LIBS="$ac_cv_search_waddstr $LIBS"
+
+fi
+
+
+    if test "$ac_cv_search_waddstr" != no; then
+      CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_TUI_OBS)"
+      CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_TUI_DEPS)"
+      CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_TUI_SRCS)"
+      ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_TUI_CFLAGS)"
+      CONFIG_ALL="${CONFIG_ALL} all-tui"
+      CONFIG_CLEAN="${CONFIG_CLEAN} clean-tui"
+      CONFIG_INSTALL="${CONFIG_INSTALL} install-tui"
+      CONFIG_UNINSTALL="${CONFIG_UNINSTALL} uninstall-tui"
+    else
+      if test x"$enable_tui" = xyes; then
+	{ { echo "$as_me:$LINENO: error: no enhanced curses library found; disable TUI" >&5
+echo "$as_me: error: no enhanced curses library found; disable TUI" >&2;}
+   { (exit 1); exit 1; }; }
+      else
+	{ echo "$as_me:$LINENO: WARNING: no enhanced curses library found; disabling TUI" >&5
+echo "$as_me: WARNING: no enhanced curses library found; disabling TUI" >&2;}
+      fi
+    fi
+  fi
+fi
+
 # Since GDB uses Readline, we need termcap functionality.  In many
 # cases this will be provided by the curses library, but some systems
 # have a seperate termcap library, or no curses library at all.
@@ -25539,32 +25594,6 @@ echo "${ECHO_T}libraries $x_libraries, headers $x_includes" >&6
 fi
 
 
-# Check whether we should enable the TUI, but only do so if we really
-# can.
-if test x"$enable_tui" != xno; then
-  if test -d $srcdir/tui; then
-    if test "$ac_cv_search_waddstr" != no; then
-      CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_TUI_OBS)"
-      CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_TUI_DEPS)"
-      CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_TUI_SRCS)"
-      ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_TUI_CFLAGS)"
-      CONFIG_ALL="${CONFIG_ALL} all-tui"
-      CONFIG_CLEAN="${CONFIG_CLEAN} clean-tui"
-      CONFIG_INSTALL="${CONFIG_INSTALL} install-tui"
-      CONFIG_UNINSTALL="${CONFIG_UNINSTALL} uninstall-tui"
-    else
-      if test x"$enable_tui" = xyes; then
-	{ { echo "$as_me:$LINENO: error: no enhanced curses library found; disable TUI" >&5
-echo "$as_me: error: no enhanced curses library found; disable TUI" >&2;}
-   { (exit 1); exit 1; }; }
-      else
-	{ echo "$as_me:$LINENO: WARNING: no enhanced curses library found; disabling TUI" >&5
-echo "$as_me: WARNING: no enhanced curses library found; disabling TUI" >&2;}
-      fi
-    fi
-  fi
-fi
-
 # Unlike the sim directory, whether a simulator is linked is controlled by
 # presence of a gdb_sim definition in the target configure.tgt entry.
 # This code just checks for a few cases where we'd like to ignore those
diff --git a/gdb/configure.ac b/gdb/configure.ac
index 677a6ae66d..054d5c274c 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -429,20 +429,70 @@ AC_SEARCH_LIBS(socketpair, socket)
 # Link in zlib if we can.  This allows us to read compressed debug sections.
 AC_SEARCH_LIBS(zlibVersion, z, [AC_CHECK_HEADERS(zlib.h)])
 
-# For the TUI, we need enhanced curses functionality.
-#
-# FIXME: kettenis/20040905: We prefer ncurses over the vendor-supplied
-# curses library because the latter might not provide all the
-# functionality we need.  However, this leads to problems on systems
-# where the linker searches /usr/local/lib, but the compiler doesn't
-# search /usr/local/include, if ncurses is installed in /usr/local.  A
-# default installation of ncurses on alpha*-dec-osf* will lead to such
-# a situation.
-AC_SEARCH_LIBS(waddstr, [ncurses cursesX curses])
-
 # On HP/UX we may need libxpdl for dlgetmodinfo (used by solib-pa64.c).
 AC_SEARCH_LIBS(dlgetmodinfo, [dl xpdl])
 
+# On alpha-osf, it appears that libtermcap and libcurses are not compatible.
+# There is a very specific comment in /usr/include/curses.h explaining that
+# termcap routines built into libcurses must not be used.
+# 
+# The symptoms we observed so far is GDB unexpectedly changing
+# the terminal settings when tgetent is called - this is particularly
+# visible as the output is missing carriage returns, and so rapidly
+# becomes very hard to read.
+#
+# The readline configure script has already decided that libtermcap
+# was enough for its purposes, and so decided to build readline using
+# libtermcap.  Since the TUI mode requires curses, building GDB with
+# TUI enabled results in both libraries to be used at the same time,
+# which is not allowed.  This basically means that GDB with TUI is
+# broken on alpha-osf.
+
+case $host_os in
+  alpha*-*-osf* )
+    if "$enable_tui" = "yes"; then
+      AC_MSG_ERROR([Building GDB with TUI mode is not supported on this host])
+    fi
+    if "$enable_tui" = "auto"; then
+      enable_tui=no
+    fi
+    ;;
+esac
+
+# Check whether we should enable the TUI, but only do so if we really
+# can.
+if test x"$enable_tui" != xno; then
+  if test -d $srcdir/tui; then
+    # For the TUI, we need enhanced curses functionality.
+    #
+    # FIXME: kettenis/20040905: We prefer ncurses over the vendor-supplied
+    # curses library because the latter might not provide all the
+    # functionality we need.  However, this leads to problems on systems
+    # where the linker searches /usr/local/lib, but the compiler doesn't
+    # search /usr/local/include, if ncurses is installed in /usr/local.  A
+    # default installation of ncurses on alpha*-dec-osf* will lead to such
+    # a situation.
+    AC_SEARCH_LIBS(waddstr, [ncurses cursesX curses])
+
+    if test "$ac_cv_search_waddstr" != no; then
+      CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_TUI_OBS)"
+      CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_TUI_DEPS)"
+      CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_TUI_SRCS)"
+      ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_TUI_CFLAGS)"
+      CONFIG_ALL="${CONFIG_ALL} all-tui"
+      CONFIG_CLEAN="${CONFIG_CLEAN} clean-tui"
+      CONFIG_INSTALL="${CONFIG_INSTALL} install-tui"
+      CONFIG_UNINSTALL="${CONFIG_UNINSTALL} uninstall-tui"
+    else
+      if test x"$enable_tui" = xyes; then
+	AC_MSG_ERROR([no enhanced curses library found; disable TUI])
+      else
+	AC_MSG_WARN([no enhanced curses library found; disabling TUI])
+      fi
+    fi
+  fi
+fi
+
 # Since GDB uses Readline, we need termcap functionality.  In many
 # cases this will be provided by the curses library, but some systems
 # have a seperate termcap library, or no curses library at all.
@@ -1748,29 +1798,6 @@ AC_SUBST(GDBTK_SRC_DIR)
 
 AC_PATH_X
 
-# Check whether we should enable the TUI, but only do so if we really
-# can.
-if test x"$enable_tui" != xno; then
-  if test -d $srcdir/tui; then
-    if test "$ac_cv_search_waddstr" != no; then
-      CONFIG_OBS="$CONFIG_OBS \$(SUBDIR_TUI_OBS)"
-      CONFIG_DEPS="$CONFIG_DEPS \$(SUBDIR_TUI_DEPS)"
-      CONFIG_SRCS="$CONFIG_SRCS \$(SUBDIR_TUI_SRCS)"
-      ENABLE_CFLAGS="$ENABLE_CFLAGS \$(SUBDIR_TUI_CFLAGS)"
-      CONFIG_ALL="${CONFIG_ALL} all-tui"
-      CONFIG_CLEAN="${CONFIG_CLEAN} clean-tui"
-      CONFIG_INSTALL="${CONFIG_INSTALL} install-tui"
-      CONFIG_UNINSTALL="${CONFIG_UNINSTALL} uninstall-tui"
-    else
-      if test x"$enable_tui" = xyes; then
-	AC_MSG_ERROR([no enhanced curses library found; disable TUI])
-      else
-	AC_MSG_WARN([no enhanced curses library found; disabling TUI])
-      fi
-    fi
-  fi
-fi
-
 # Unlike the sim directory, whether a simulator is linked is controlled by 
 # presence of a gdb_sim definition in the target configure.tgt entry.  
 # This code just checks for a few cases where we'd like to ignore those