cgo：体系结构 x86_64 的未定义符号

Question

我想从 C 函数空间调用 go func，但程序抛出构建错误。例子.gopackage main/*#include "test.c"*/import "C"import "fmt"func Example() {    fmt.Println("this is go")    fmt.Println(C.GoString(C.myprint(C.CString("go!!"))))}// export receiveC              (remove the extra space between // and export)func receiveC(msg *C.char) {    fmt.Println(C.GoString(msg))}func main() {    Example()}测试.c#include <stdio.h>extern void receiveC(char *msg);char* myprint(char *msg) {    receiveC(msg);  // calling the exported go function    return msg;         }当我执行命令来运行/构建（go build或go run example.go或go build example.go）程序时，它会抛出错误：# github.com/subh007/goodl/cgoUndefined symbols for architecture x86_64:  "_receiveC", referenced from:      _myprint in example.cgo2.o      __cgo_6037ec60b2ba_Cfunc_myprint in example.cgo2.o      _myprint in test.old: symbol(s) not found for architecture x86_64clang: error: linker command failed with exit code 1 (use -v to see invocation)我正在按照cgo 幻灯片编写程序。请让我知道这里的任何错误。编辑 1：我使用的是 OS-X 10.9 操作系统。EDIT2：我之间的一个额外的空间// export，应该有之间没有空格//和export。但是现在我在构建时遇到以下错误：# github.com/subh007/goodl/cgoduplicate symbol _myprint in:    $WORK/github.com/subh007/goodl/cgo/_obj/_cgo_export.o    $WORK/github.com/subh007/goodl/cgo/_obj/example.cgo2.oduplicate symbol _receiver_go in:    $WORK/github.com/subh007/goodl/cgo/_obj/_cgo_export.o    $WORK/github.com/subh007/goodl/cgo/_obj/example.cgo2.oduplicate symbol _myprint in:    $WORK/github.com/subh007/goodl/cgo/_obj/_cgo_export.o    $WORK/github.com/subh007/goodl/cgo/_obj/test.oduplicate symbol _receiver_go in:    $WORK/github.com/subh007/goodl/cgo/_obj/_cgo_export.o    $WORK/github.com/subh007/goodl/cgo/_obj/test.old: 4 duplicate symbols for architecture x86_64clang: error: linker command failed with exit code 1 (use -v to see invocation)