From 5fcf442f4f0d85c5f3fcf6bfd4ecbf37a1f3f4c9 Mon Sep 17 00:00:00 2001
From: Ali Saidi <Ali.Saidi@ARM.com>
Date: Mon, 8 Nov 2010 13:58:24 -0600
Subject: [PATCH] scons: add a parameter to configure SCons' build cache

---
 SConstruct | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/SConstruct b/SConstruct
index 850c122ca..b265c50af 100644
--- a/SConstruct
+++ b/SConstruct
@@ -312,6 +312,7 @@ global_sticky_vars.AddVariables(
     ('CXX', 'C++ compiler', environ.get('CXX', main['CXX'])),
     ('BATCH', 'Use batch pool for build and tests', False),
     ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
+    ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
     ('EXTRAS', 'Add Extra directories to the compilation', '',
      PathListAllExist, PathListMakeAbsolute),
     )
@@ -549,6 +550,12 @@ py_libs.append(py_version)
 main.Append(CPPPATH=py_includes)
 main.Append(LIBPATH=py_lib_path)
 
+# Cache build files in the supplied directory.
+if main['M5_BUILD_CACHE']:
+    print 'Using build cache located at', main['M5_BUILD_CACHE']
+    CacheDir(main['M5_BUILD_CACHE'])
+
+
 # verify that this stuff works
 if not conf.CheckHeader('Python.h', '<>'):
     print "Error: can't find Python.h header in", py_includes