scons: wrap python invocations with helper script that attempts to find a non-3.x python

SVN-Revision: 31742

tools/scons/Makefile

@@ -23,7 +23,12 @@ define Host/Compile
 endef
 
 define Host/Install
-	python $(HOST_BUILD_DIR)/setup.py install --prefix=$(STAGING_DIR_HOST)
+	./files/pywrap.sh $(HOST_BUILD_DIR)/setup.py install --prefix=$(STAGING_DIR_HOST)
+	rm -f $(STAGING_DIR_HOST)/bin/scons*.py
+	for bin in $(STAGING_DIR_HOST)/bin/scons*; do \
+		mv "$$$$bin" "$$$$bin.py";                \
+		cp ./files/pywrap.sh "$$$$bin";           \
+	done
 endef
 
 $(eval $(call HostBuild))

tools/scons/files/pywrap.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+case "${0##*/}" in
+	pywrap.sh) arg1="";;
+	*) arg1="$0.py" ;;
+esac
+
+for bin in python2.7 python2.6 python2.5 python2.4 python2 python; do
+    case "$($bin -V 2>&1)" in
+        "Python 2"*) exec $bin $arg1 "$@" ;;
+    esac
+done
+
+echo "Unable to find a Python 2.x interpreter for executing ${arg1:+$arg1 }$@ !" >&2
+exit 1