Miscellaneous build and test fixes

* Use lodash snapshot, fixes lodashtest.

* Fix underscore test shim.

* Emscripten option updates to make dukweb.js and Emscripten tests
  work again.

* Update emscripten-status.rst.

Makefile

@@ -204,9 +204,9 @@ endif
 # Reducing the TOTAL_MEMORY and TOTAL_STACK values is useful if you run
 # Duktape cmdline with resource limits (i.e. "duk -r test.js").
 #EMCCOPTS = -s TOTAL_MEMORY=2097152 -s TOTAL_STACK=524288 --memory-init-file 0
-EMCCOPTS = -O2 -std=c99 -Wall --memory-init-file 0
+EMCCOPTS = -O2 -std=c99 -Wall --memory-init-file 0 -s WASM=0 -s POLYFILL_OLD_MATH_FUNCTIONS
-EMCCOPTS_DUKVM = -O2 -std=c99 -Wall --memory-init-file 0 -DEMSCRIPTEN
+EMCCOPTS_DUKVM = -O2 -std=c99 -Wall --memory-init-file 0 -DEMSCRIPTEN -s WASM=0
-EMCCOPTS_DUKWEB_EXPORT = -s EXPORTED_FUNCTIONS='["_dukweb_is_open", "_dukweb_open","_dukweb_close","_dukweb_eval"]'
+EMCCOPTS_DUKWEB_EXPORT = -s EXPORTED_FUNCTIONS='["_dukweb_is_open", "_dukweb_open","_dukweb_close","_dukweb_eval"]' -s 'EXTRA_EXPORTED_RUNTIME_METHODS=["ccall","cwrap"]'
 EMDUKOPTS = -s TOTAL_MEMORY=268435456 -DDUK_CMDLINE_PRINTALERT_SUPPORT
 EMDUKOPTS += -DEMSCRIPTEN  # enable stdin workaround in duk_cmdline.c
 
@@ -848,8 +848,10 @@ underscore:
 lodash:
 	# http://lodash.com/
 	# https://github.com/lodash
-	# Master is OK because not a critical dependency
+	# Use pre-built .js file.
-	$(GIT) clone --depth 1 https://github.com/lodash/lodash.git
+	mkdir lodash
+	cd lodash && wget https://raw.githubusercontent.com/lodash/lodash/4.17.10-npm/lodash.js -O lodash.js
+	#$(GIT) clone --depth 1 https://github.com/lodash/lodash.git
 3883a2e9063b0a5f2705bdac3263577a03913c94.zip:
 	# http://test262.ecmascript.org/
 	# https://github.com/tc39/test262

doc/emscripten-status.rst

@@ -7,13 +7,20 @@ Hello world test
 
 Quick hello world test::
 
-  $ ./emcc --memory-init-file 0 tests/hello_world.cpp -o /tmp/test.js
+  $ ./emcc --memory-init-file 0 \
+          -s WASM=0 -s POLYFILL_OLD_MATH_FUNCTIONS=1 \
+          tests/hello_world.cpp -o /tmp/test.js
   $ duk /tmp/test.js
 
 Tweaks needed:
 
 * ``--memory-init-file 0``: don't use an external memory file.
 
+* ``-s WASM=0``: disable WebAssembly support, as Duktape doesn't support it.
+
+* ``-s POLYFILL_OLD_MATH_FUNCTIONS``: don't assume post-ES5.1 Math functions
+  like Math.fround().
+
 Normally this suffices.  If you're running Duktape with a small amount of
 memory (e.g. when running the Duktape command line tool with the ``-r``
 option) you may need to reduce Emscription "virtual memory" size with the

util/underscore-test-shim.js

@@ -198,3 +198,8 @@ delete require;
 
 // ... and the 'window' binding is expected
 var window = new Function('return this;')();
+window.location = {};
+window.location.protocol = 'file:';
+window.location.search = '?';
+window.addEventListener = function nop() {};
+window.removeEventListener = function nop() {};