Add an ambuild configure option to disable auto versioning.

AMBuildScript

@@ -73,7 +73,7 @@ class SMConfig(object):
     self.versionlib = None
 
   def use_auto_versioning(self):
-    return builder.backend == 'amb2'
+    return builder.backend == 'amb2' and not builder.options.disable_auto_versioning
 
   @property
   def tag(self):

configure.py

@@ -31,4 +31,6 @@ run.options.add_option('-s', '--sdks', default='all', dest='sdks',
                             'comma-delimited list of engine names (default: %default)')
 run.options.add_option('--breakpad-dump', action='store_true', dest='breakpad_dump',
 											 default=False, help='Dump and upload breakpad symbols')
+run.options.add_option('--disable-auto-versioning', action='store_true', dest='disable_auto_versioning',
+                       default=False, help='Disable the auto versioning script')
 run.Configure()

plugins/AMBuilder

@@ -51,7 +51,7 @@ def build_plugin(script_path, smx_file):
     argv = argv,
     outputs = outputs,
     dep_type = 'msvc',
-    weak_inputs = SM.generated_headers
+    weak_inputs = SM.generated_headers or []
   )
   SM.smx_files[smx_file] = smx_entry
 

tools/buildbot/PackageScript

@@ -51,10 +51,12 @@ for cxx_task in SM.extensions:
   builder.AddCopy(cxx_task.binary, folder_map['addons/sourcemod/extensions'])
 builder.AddCopy(SM.spcomp.binary, folder_map['addons/sourcemod/scripting'])
 
-# Copy version_auto.inc.
-for header in SM.generated_headers:
-  if 'version_auto.inc' in header.path:
-    builder.AddCopy(header, folder_map['addons/sourcemod/scripting/include'])
+
+if SM.use_auto_versioning():
+  # Copy version_auto.inc.
+  for header in SM.generated_headers:
+    if 'version_auto.inc' in header.path:
+      builder.AddCopy(header, folder_map['addons/sourcemod/scripting/include'])
 
 # Export PDB files. We write to a file in the build folder which is pretty
 # verboten, but it's okay if it's in the root since AMBuild will never try