[Memory64] new 64-bit related command-line flags

Author: aardappel

embuilder.py

@@ -127,6 +127,8 @@ def main():
                       help='build relocatable objects for suitable for dynamic linking')
   parser.add_argument('--force', action='store_true',
                       help='force rebuild of target (by removing it first)')
+  parser.add_argument('--wasm64', action='store_true',
+                      help='use wasm64 architecture')
   parser.add_argument('operation', help='currently only "build" is supported')
   parser.add_argument('targets', nargs='+', help='see below')
   args = parser.parse_args()
@@ -147,6 +149,9 @@ def main():
   if args.pic:
     settings.RELOCATABLE = 1
 
+  if args.wasm64:
+    settings.MEMORY64 = 2
+
   if args.force:
     force = True
 

emscripten.py

@@ -127,6 +127,9 @@ def update_settings_glue(metadata, DEBUG):
 
   # start with the MVP features, and add any detected features.
   settings.BINARYEN_FEATURES = ['--mvp-features'] + metadata['features']
+  # ensure '--enable-memory64' is set exactly once:
+  if settings.MEMORY64 and '--enable-memory64' not in settings.BINARYEN_FEATURES:
+    settings.BINARYEN_FEATURES += ['--enable-memory64']
   if settings.USE_PTHREADS:
     assert '--enable-threads' in settings.BINARYEN_FEATURES
   if settings.MEMORY64: