Merge pull request #3824 from ruby/reduce-wasm-size

Reduce size of the WASM file (2M->480K)

Author: kddnewton

Makefile

@@ -43,7 +43,13 @@ build/libprism.a: $(STATIC_OBJECTS)
 
 javascript/src/prism.wasm: Makefile $(SOURCES) $(HEADERS)
 	$(ECHO) "building $@"
-	$(Q) $(WASI_SDK_PATH)/bin/clang --sysroot=$(WASI_SDK_PATH)/share/wasi-sysroot/ $(DEBUG_FLAGS) -DPRISM_EXPORT_SYMBOLS -D_WASI_EMULATED_MMAN -lwasi-emulated-mman $(CPPFLAGS) $(CFLAGS) -Wl,--export-all -Wl,--no-entry -mexec-model=reactor -o $@ $(SOURCES)
+	$(Q) $(WASI_SDK_PATH)/bin/clang --sysroot=$(WASI_SDK_PATH)/share/wasi-sysroot/ \
+		$(DEBUG_FLAGS) \
+		-DPRISM_EXPORT_SYMBOLS -DPRISM_EXCLUDE_PRETTYPRINT -DPRISM_EXCLUDE_JSON -DPRISM_EXCLUDE_PACK \
+		-D_WASI_EMULATED_MMAN -lwasi-emulated-mman $(CPPFLAGS) $(CFLAGS) \
+		-Wl,--export-all -Wl,--gc-sections -Wl,--strip-all -Wl,--lto-O3 -Wl,--no-entry -mexec-model=reactor \
+		-Oz -g0 -flto -fdata-sections -ffunction-sections \
+		-o $@ $(SOURCES)
 
 java-wasm/src/test/resources/prism.wasm: Makefile $(SOURCES) $(HEADERS)
 	$(ECHO) "building $@"