Mono/C#: WebAssembly support

modules/mono/config.py

@@ -1,10 +1,11 @@
 def can_build(env, platform):
-    if platform in ['javascript']:
-        return False # Not yet supported
     return True
 
 
 def configure(env):
+    if env['platform'] not in ['windows', 'osx', 'x11', 'server', 'android', 'haiku', 'javascript']:
+        raise RuntimeError('This module does not currently support building for this platform')
+
     env.use_ptrcall = True
     env.add_module_version_string('mono')
 
@@ -18,6 +19,13 @@ def configure(env):
     envvars.Add(BoolVariable('xbuild_fallback', 'If MSBuild is not found, fallback to xbuild', False))
     envvars.Update(env)
 
+    if env['platform'] == 'javascript':
+        # Mono wasm already has zlib builtin, so we need this workaround to avoid symbol collisions
+        print('Compiling with Mono wasm disables \'builtin_zlib\'')
+        env['builtin_zlib'] = False
+        thirdparty_zlib_dir = "#thirdparty/zlib/"
+        env.Prepend(CPPPATH=[thirdparty_zlib_dir])
+
 
 def get_doc_classes():
     return [