feat: add go-ffi demo

src/core_ffi/go_ffi/demo.c

@@ -0,0 +1,7 @@
+#include "demo.h"
+
+#include <stdio.h>
+
+void hello() {
+    printf("hello from c\n");
+}

src/core_ffi/go_ffi/demo.cc

@@ -0,0 +1,7 @@
+#include "demo.h"
+
+#include <iostream>
+
+void hello() {
+    std::cout << "hello from c++" << std::endl;
+}

src/core_ffi/go_ffi/demo.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void hello();
+
+#ifdef __cplusplus
+}
+#endif

src/core_ffi/go_ffi/klotski.go

@@ -0,0 +1,13 @@
+package main
+
+/*
+#cgo LDFLAGS: -L${SRCDIR}/ -ldemo -lstdc++
+#include "demo.h"
+*/
+import "C"
+import "fmt"
+
+func main() {
+    fmt.Println("hello from go")
+    C.hello()
+}

src/core_ffi/go_ffi/test_c.sh

@@ -0,0 +1,7 @@
+gcc -O3 -c demo.c -o demo.o
+ar rcs libdemo.a demo.o
+rm -f demo.o
+ranlib libdemo.a
+
+go run klotski.go
+rm -f libdemo.a

src/core_ffi/go_ffi/test_cpp.sh

@@ -0,0 +1,7 @@
+g++ -O3 -c demo.cc -o demo.o
+ar rcs libdemo.a demo.o
+rm -f demo.o
+ranlib libdemo.a
+
+go run klotski.go
+rm -f libdemo.a