From 6421a3ea12cf519b165afc3700a86058bdcc381d Mon Sep 17 00:00:00 2001
From: Julien Rioux <julien.rioux@gmail.com>
Date: Tue, 16 Jul 2013 22:42:32 +0200
Subject: [PATCH] Support for testing min and max versions of Python.

---
 aclocal.m4 | 53 +++++++++++++++++++++++++++++++++++------------------
 1 file changed, 35 insertions(+), 18 deletions(-)

diff --git a/aclocal.m4 b/aclocal.m4
index 85febc0d85..87d8474316 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -885,7 +885,7 @@ AC_DEFUN(STEPMAKE_INIT, [
     fi
     AC_SUBST(SHELL)
 
-    STEPMAKE_PYTHON(REQUIRED, 1.5)
+    STEPMAKE_PYTHON(REQUIRED, 1.5, 3.0)
 
     if expr "$MAKE" : '.*\(echo\)' >/dev/null; then
  	$MAKE -v 2> /dev/null | grep GNU > /dev/null
@@ -1031,33 +1031,49 @@ AC_DEFUN(STEPMAKE_PERL, [
 ])
 
 
+# Check for python, between minimum ($2) and maximum version ($3).
+# If missing, add entry to missing-list ($1, one of 'OPTIONAL', 'REQUIRED')
 AC_DEFUN(STEPMAKE_PYTHON, [
-    unset pv
     AC_MSG_CHECKING([for python])
-    for python in $PYTHON python python2 python2.4 python2.3 python2.2 python2.1 python2.0; do
-	AC_MSG_RESULT([$python])
-	if ! $python -V > /dev/null 2>&1 ; then
-	    #AC_MSG_WARN([cannot execute $python])
-	    PYTHON='echo no python'
+    python="python"
+    found="no"
+    for r in $PYTHON python python3 python3.3 python3.2 python3.1 python3.0 python2 python2.7 python2.6 python2.5 python2.4 python2.3 python2.2 python2.1 python2.0; do
+	exe=`STEPMAKE_GET_EXECUTABLE($r)`
+	if ! $exe -V > /dev/null 2>&1 ; then
+	    continue
+	fi
+	ver=`STEPMAKE_GET_VERSION($exe)`
+	num=`STEPMAKE_NUMERIC_VERSION($ver)`
+	req=`STEPMAKE_NUMERIC_VERSION($2)`
+	sup=`STEPMAKE_NUMERIC_VERSION($3)`
+	if test -n "$2" && test "$num" -lt "$req"; then
+	    python=["$r >= $2 (installed: $ver)"]
+	    continue
 	else
-	    unset pv
-	    STEPMAKE_CHECK_VERSION(python, pv, $2)
-	    if test -z "$pv"; then
-		PYTHON=$python
+	    if test -n "$3" && test "$num" -ge "$sup"; then
+		python=["$r < $3 (installed: $ver)"]
+		continue
+	    else
+		python=$r
+		found=$r
 		break
 	    fi
 	fi
     done
-    if test -n "$pv"; then
-	STEPMAKE_ADD_ENTRY($1, $pv)
+    AC_MSG_RESULT([$found])
+    if test "$found" != "no"; then
+	AC_MSG_CHECKING([$python version])
+	AC_MSG_RESULT([$ver])
+	PYTHON=$found
+    else
+	STEPMAKE_ADD_ENTRY($1, $python)
     fi
-    # clear cached value since arg 2 might point us to a new binary
-    unset ac_cv_path_PYTHON
-
     AC_PATH_PROG(PYTHON, $PYTHON)
     AC_SUBST(PYTHON)
 ])
 
+# Check for python-config, between minimum ($2) and maximum version ($3).
+# If missing, add entry to missing-list ($1, one of 'OPTIONAL', 'REQUIRED')
 AC_DEFUN(STEPMAKE_PYTHON_DEVEL, [
     AC_ARG_WITH(python-include,
 	[AS_HELP_STRING([--with-python-include=DIR],
@@ -1078,8 +1094,9 @@ AC_DEFUN(STEPMAKE_PYTHON_DEVEL, [
 	    LDFLAGS="$LDFLAGS -l${withval}"
 	fi
     ])
-    
-    AC_CHECK_PROGS(PYTHON_CONFIG, python-config, no)
+
+    STEPMAKE_PYTHON($1, $2, $3)
+    AC_CHECK_PROGS(PYTHON_CONFIG, `basename $PYTHON`-config, no)
 
     if test -z "$PYTHON_CFLAGS" -a "$PYTHON_CONFIG" != "no"; then
         # Clean out junk: http://bugs.python.org/issue3290
-- 
2.39.2