examples: wamr example program

wasm-base/Dockerfile

@@ -29,5 +29,9 @@ RUN apt-get update \
  && apt-get clean
 
 COPY --from=wamr-builder /wasm-micro-runtime/product-mini/platforms/linux/build /opt/wasm-micro-runtime
+RUN pwd
+COPY ./examples /home/ubuntu/examples
+
+WORKDIR /home/ubuntu/examples
 
 ENV PATH="$PATH:/opt/wasi-sdk/bin:/opt/wasm-micro-runtime"

wasm-base/examples/Makefile

@@ -0,0 +1,20 @@
+WASI_SDK := /opt/wasi-sdk
+CLANG    := $(WASI_SDK)/bin/clang
+SYSROOT  := $(WASI_SDK)/share/wasi-sysroot
+
+CFLAGS   :=	--target=wasm32-wasi \
+			--sysroot=$(SYSROOT) \
+			-O2
+
+SRCS     := $(wildcard *.c)
+WASMS    := $(SRCS:.c=.wasm)
+
+.PHONY: build-examples clean
+
+build-examples: $(WASMS)
+
+%.wasm: %.c
+	$(CLANG) $(CFLAGS) $< -o $@
+
+clean:
+	rm -f *.wasm

wasm-base/examples/test.c

@@ -0,0 +1,24 @@
+// https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/doc/build_wasm_app.md#user-content-build-wasm-applications-with-wasi-sdk
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv) {
+  char *buf;
+
+  printf("Hello world!\n");
+
+  buf = malloc(1024);
+  if (!buf) {
+    printf("malloc buf failed\n");
+    return -1;
+  }
+
+  printf("buf ptr: %p\n", buf);
+
+  sprintf(buf, "%s", "1234\n");
+  printf("buf: %s", buf);
+
+  free(buf);
+  return 0;
+}