Index: configure
===================================================================
--- configure	(revision 62480)
+++ configure	(working copy)
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 62447 .
+# From configure.in Revision: 62451 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 2.6.
 #
@@ -4532,6 +4532,67 @@
     then
       BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"
     fi
+
+    # The gcc -mieee option provides full IEEE 754 support (modulo
+    # correct treatment of the 'inexact' flag) on some machines that
+    # only provide partial hardware support for IEEE 754; for example,
+    # on alpha.  Use -mieee if it's supported.
+    { echo "$as_me:$LINENO: checking whether $CC accepts -mieee" >&5
+echo $ECHO_N "checking whether $CC accepts -mieee... $ECHO_C" >&6; }
+     ac_save_cc="$CC"
+     CC="$CC -mieee"
+     if test "$cross_compiling" = yes; then
+  ac_cv_mieee_ok=no
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+int main() { return 0; }
+_ACEOF
+rm -f conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_mieee_ok=yes
+else
+  echo "$as_me: program exited with status $ac_status" >&5
+echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+( exit $ac_status )
+ac_cv_mieee_ok=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+fi
+
+
+     CC="$ac_save_cc"
+    { echo "$as_me:$LINENO: result: $ac_cv_mieee_ok" >&5
+echo "${ECHO_T}$ac_cv_mieee_ok" >&6; }
+    if test $ac_cv_mieee_ok = yes
+    then
+      BASECFLAGS="$BASECFLAGS -mieee"
+    fi
+
     case $ac_sys_system in
 	SCO_SV*)
 	    BASECFLAGS="$BASECFLAGS -m486 -DSCO5"
Index: configure.in
===================================================================
--- configure.in	(revision 62480)
+++ configure.in	(working copy)
@@ -817,6 +817,25 @@
     then
       BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"
     fi
+
+    # The gcc -mieee option provides full IEEE 754 support (modulo
+    # correct treatment of the 'inexact' flag) on some machines that
+    # only provide partial hardware support for IEEE 754; for example,
+    # on alpha.  Use -mieee if it's supported.
+    AC_MSG_CHECKING(whether $CC accepts -mieee)
+     ac_save_cc="$CC"
+     CC="$CC -mieee"
+     AC_TRY_RUN([int main() { return 0; }],
+     ac_cv_mieee_ok=yes,
+     ac_cv_mieee_ok=no,
+     ac_cv_mieee_ok=no)
+     CC="$ac_save_cc"
+    AC_MSG_RESULT($ac_cv_mieee_ok)
+    if test $ac_cv_mieee_ok = yes
+    then
+      BASECFLAGS="$BASECFLAGS -mieee"
+    fi
+
     case $ac_sys_system in
 	SCO_SV*)
 	    BASECFLAGS="$BASECFLAGS -m486 -DSCO5"