From b0e2b4c52f2464041f71bf3a78e53d8ecc5dc0df Mon Sep 17 00:00:00 2001
From: Mark Dickinson <dickinsm@gmail.com>
Date: Sat, 26 Apr 2008 20:48:56 +0000
Subject: [PATCH] Merged revisions 62499 via svnmerge from
 svn+ssh://pythondev@svn.python.org/python/trunk

........
  r62499 | mark.dickinson | 2008-04-25 12:11:04 -0400 (Fri, 25 Apr 2008) | 7 lines

  Issue #1496032.  Add -mieee to BASECFLAGS on alpha, when gcc is
  the compiler.  This should(?) help to fix failures in test_math
  and test_cmath on Linux/alpha.

  Also add configure message reporting the result of uname -m, as
  a debugging aid.
........
---
 Misc/NEWS    |  2 ++
 configure    | 18 +++++++++++++++++-
 configure.in | 14 ++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/Misc/NEWS b/Misc/NEWS
index 0ac400dbcf7..5c3b875a69a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -47,6 +47,8 @@ Library
 Build
 -----
 
+- Issue #1496032: On alpha, use -mieee when gcc is the compiler.
+
 - "make install" is now an alias for "make altinstall", to prevent
   accidentally overwriting a Python 2.x installation.
   Use "make fullinstall" to force Python 3.0 to be installed as
diff --git a/configure b/configure
index 86d4c46c28f..295f4350868 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 62146 .
+# From configure.in Revision: 62451 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 3.0.
 #
@@ -2153,6 +2153,12 @@ echo "${ECHO_T}$EXTRAPLATDIR" >&6; }
 CONFIGURE_MACOSX_DEPLOYMENT_TARGET=
 EXPORT_MACOSX_DEPLOYMENT_TARGET='#'
 
+{ echo "$as_me:$LINENO: checking machine type as reported by uname -m" >&5
+echo $ECHO_N "checking machine type as reported by uname -m... $ECHO_C" >&6; }
+ac_sys_machine=`uname -m`
+{ echo "$as_me:$LINENO: result: $ac_sys_machine" >&5
+echo "${ECHO_T}$ac_sys_machine" >&6; }
+
 # checks for alternative programs
 
 # compiler flags are generated in two sets, BASECFLAGS and OPT.  OPT is just
@@ -4503,6 +4509,16 @@ echo "${ECHO_T}$ac_cv_no_strict_aliasing_ok" >&6; }
     then
       BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"
     fi
+
+    # if using gcc on alpha, use -mieee to get (near) full IEEE 754
+    # support.  Without this, treatment of subnormals doesn't follow
+    # the standard.
+    case $ac_sys_machine in
+         alpha*)
+                BASECFLAGS="$BASECFLAGS -mieee"
+                ;;
+    esac
+
     case $ac_sys_system in
 	SCO_SV*)
 	    BASECFLAGS="$BASECFLAGS -m486 -DSCO5"
diff --git a/configure.in b/configure.in
index a1c044f3a68..43d6ae0ee4a 100644
--- a/configure.in
+++ b/configure.in
@@ -333,6 +333,10 @@ AC_SUBST(EXPORT_MACOSX_DEPLOYMENT_TARGET)
 CONFIGURE_MACOSX_DEPLOYMENT_TARGET=
 EXPORT_MACOSX_DEPLOYMENT_TARGET='#'
 
+AC_MSG_CHECKING(machine type as reported by uname -m)
+ac_sys_machine=`uname -m`
+AC_MSG_RESULT($ac_sys_machine)
+
 # checks for alternative programs
 
 # compiler flags are generated in two sets, BASECFLAGS and OPT.  OPT is just
@@ -792,6 +796,16 @@ yes)
     then
       BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"
     fi
+
+    # if using gcc on alpha, use -mieee to get (near) full IEEE 754
+    # support.  Without this, treatment of subnormals doesn't follow
+    # the standard.
+    case $ac_sys_machine in
+         alpha*)
+                BASECFLAGS="$BASECFLAGS -mieee"
+                ;;
+    esac
+
     case $ac_sys_system in
 	SCO_SV*)
 	    BASECFLAGS="$BASECFLAGS -m486 -DSCO5"