Refactor the wasm graphic layer (wgl) and the gui sample (#231)

samples/gui/wasm-apps/increase/Makefile

@@ -0,0 +1,34 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+CC = /opt/wasi-sdk/bin/clang
+APP_DIR = ${shell pwd}
+IWASM_DIR = ../../../../core/iwasm
+APP_FRAMEWORK_DIR = ../../../../core/app-framework
+DEPS_DIR = ../../../../core/deps
+
+CFLAGS += -O3 \
+	  -Wno-int-conversion \
+	  -I$(APP_DIR)/src \
+	  -I$(APP_FRAMEWORK_DIR)/base/app \
+	  -I$(APP_FRAMEWORK_DIR)/app-native-shared \
+	  -I$(APP_FRAMEWORK_DIR)/sensor/app \
+	  -I$(APP_FRAMEWORK_DIR)/wgl/app \
+	  -I$(APP_FRAMEWORK_DIR)/connection/app \
+	  -I${DEPS_DIR}
+
+SRCS += $(APP_DIR)/src/main.c
+
+# For app size consideration, not all but necessary app libs are included
+SRCS += $(APP_FRAMEWORK_DIR)/base/app/timer.c
+SRCS += $(APP_FRAMEWORK_DIR)/wgl/app/src/*.c
+
+all:
+	@$(CC) $(CFLAGS) $(SRCS) \
+    --target=wasm32 -O3 -z stack-size=2048 -Wl,--initial-memory=65536 \
+    -Wl,--allow-undefined \
+    -Wl,--no-threads,--strip-all,--no-entry -nostdlib \
+    -Wl,--export=on_init -Wl,--export=on_timer_callback \
+    -Wl,--export=on_widget_event \
+    -Wl,--export=__heap_base,--export=__data_end \
+    -o ui_app.wasm