BuildEnv: Eliminate RUBY as build environment variable

This patch replaces RUBY with PROTOCOL in all the SConscript files as
the environment variable that decides whether or not certain components
of the simulator are compiled.

SConstruct

@@ -979,11 +979,6 @@ for variant_path in variant_paths:
     if env['USE_SSE2']:
         env.Append(CCFLAGS=['-msse2'])
 
-    if env['PROTOCOL'] != 'None':
-        env['RUBY'] = True
-    else:
-        env['RUBY'] = False
-
     # The src/SConscript file sets up the build rules in 'env' according
     # to the configured variables.  It returns a list of environments,
     # one for each variant build (debug, opt, etc.)

src/cpu/testers/directedtest/SConscript

@@ -35,7 +35,7 @@ Import('*')
 # When this dependency is removed, the ruby tester should be compiled
 # independently from Ruby
 #
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('RubyDirectedTester.py')

src/cpu/testers/rubytest/SConscript

@@ -35,7 +35,7 @@ Import('*')
 # When this dependency is removed, the ruby tester should be compiled
 # independently from Ruby
 #
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('RubyTester.py')

src/mem/protocol/SConscript

@@ -38,7 +38,7 @@ from SCons.Scanner import Classic
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 protocol_dir = Dir('.')

src/mem/ruby/SConscript

@@ -40,7 +40,7 @@ Import('*')
 if env['TARGET_ISA'] == 'no':
     Return()
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 def do_embed_text(target, source, env):

src/mem/ruby/buffers/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('MessageBuffer.cc')

src/mem/ruby/common/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('Address.cc')

src/mem/ruby/eventqueue/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('RubyEventQueue.cc')

src/mem/ruby/filters/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('BlockBloomFilter.cc')

src/mem/ruby/network/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('BasicLink.py')

src/mem/ruby/network/garnet/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('BaseGarnetNetwork.py')

src/mem/ruby/network/garnet/fixed-pipeline/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('GarnetLink_d.py')

src/mem/ruby/network/garnet/flexible-pipeline/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('GarnetLink.py')

src/mem/ruby/network/orion/Allocator/SConscript

@@ -28,7 +28,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('Arbiter.cc')

src/mem/ruby/network/orion/Buffer/SConscript

@@ -28,7 +28,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('AmpUnit.cc')

src/mem/ruby/network/orion/Crossbar/SConscript

@@ -28,7 +28,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('Crossbar.cc')

src/mem/ruby/network/orion/SConscript

@@ -27,7 +27,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 Source('NetworkPower.cc')

src/mem/ruby/network/simple/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('SimpleLink.py')

src/mem/ruby/network/topologies/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 PySource('', 'Crossbar.py')

src/mem/ruby/profiler/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('Profiler.py')

src/mem/ruby/recorder/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('Tracer.py')

src/mem/ruby/slicc_interface/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('Controller.py')

src/mem/ruby/system/SConscript

@@ -30,7 +30,7 @@
 
 Import('*')
 
-if not env['RUBY']:
+if env['PROTOCOL'] == 'None':
     Return()
 
 SimObject('Cache.py')

tests/SConscript

@@ -288,7 +288,7 @@ else:
                 'simple-atomic-mp', 'simple-timing-mp', 'o3-timing-mp',
                 'inorder-timing', 'rubytest']
 
-if env['RUBY']:
+if env['PROTOCOL'] != 'None':
     if env['PROTOCOL'] == 'MI_example':
         configs += [c + "-ruby" for c in configs]
     else: