From 1f5edf45f0b8c8b2ed196acb076a42ada55e2332 Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@dbsgeo.com>
Date: Tue, 10 Feb 2009 17:59:49 +0000
Subject: [PATCH] scons: Use implicit caching of deps if SCONS_CACHE is
 requested which should double or triple the speed at which the 'scons:
 Building targets ...' step will run. Hint: use the --implicit-deps-unchanged
 flag for even quicker target checking

---
 SConstruct | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/SConstruct b/SConstruct
index 802bfabed..5fa9120e8 100644
--- a/SConstruct
+++ b/SConstruct
@@ -226,12 +226,16 @@ color_print (4,"Building on %s in *%s*..." % (env['PLATFORM'],mode))
 Help(opts.GenerateHelpText(env))
 
 if env['SCONS_CACHE']:
-    pass # caching is 'auto' by default in SCons
+    # caching is 'auto' by default in SCons
+    # But let's also cache implicit deps...
+    SetOption('implicit_cache', 1)
+    
 else:
     # Set the cache mode to 'force' unless requested, avoiding hidden caching of Scons 'opts' in '.sconsign.dblite'
     # This allows for a SCONS_LOCAL_CONFIG, if present, to be used as the primary means of storing paths to successful build dependencies
     from SCons.SConf import SetCacheMode
     SetCacheMode('force')
+    
 
 thread_suffix = 'mt'
 if env['PLATFORM'] == 'FreeBSD':