build scripts: Made minor modifications to reduce build overhead time.

1. --implicit-cache behavior is default.
2. makeEnv in src/SConscript is conditionally called.
3. decider set to MD5-timestamp
4. NO_HTML build option changed to SLICC_HTML (defaults to False)

1 files changed, 2 insertions, 0 deletions

diff --git a/SConstruct b/SConstruct
index f5a46286c..19bc6e41b 100755
--- a/SConstruct
+++ b/SConstruct
@@ -192,6 +192,8 @@ for key,val in os.environ.iteritems():
         use_env[key] = val
 
 main = Environment(ENV=use_env)
+main.Decider('MD5-timestamp')
+main.SetOption('implicit_cache', 1)
 main.root = Dir(".")         # The current directory (where this file lives).
 main.srcdir = Dir("src")     # The source directory