我在构建一个非常简单的通过 cgo 调用 c 代码的 go 程序时遇到了问题。 我的设置:
$: echo $GOPATH
/go
$: pwd
/go/src/main
$: ls
ctest.c ctest.h test.go
test.go 包含: 包主
// #include "ctest.c"
// #include <stdlib.h>
import "C"
import "unsafe"
import "fmt"
func main() {
cs := C.ctest(C.CString("c function"))
defer C.free(unsafe.Pointer(cs))
index := "hello from go: " + C.GoString(cs)
fmt.Println(index)
}
ctest.h 包含:
char* ctest (char*);
ctest.c 包含:
#include "ctest.h"
char* ctest (char* input) {
return input;
};
当我运行 go build test.go
时,我得到一个二进制文件,test
,我可以运行它打印预期的 hello from go: c function
但是,当我运行 go build
时,出现错误:
# main
/tmp/go-build599750908/main/_obj/ctest.o: In function `ctest':
./ctest.c:3: multiple definition of `ctest'
/tmp/go-build599750908/main/_obj/test.cgo2.o:/go/src/main/ctest.c:3: first defined here
collect2: error: ld returned 1 exit status
不在 go build test.go
中的 go build
发生了什么导致了错误?
最佳答案
仔细阅读您的代码。阅读错误消息。更正错误:
// #include "ctest.h"
test.go
:
package main
// #include "ctest.h"
// #include <stdlib.h>
import "C"
import "unsafe"
import "fmt"
func main() {
cs := C.ctest(C.CString("c function"))
defer C.free(unsafe.Pointer(cs))
index := "hello from go: " + C.GoString(cs)
fmt.Println(index)
}
ctest.h
:
char* ctest (char*);
ctest.c
:
#include "ctest.h"
char* ctest (char* input) {
return input;
};
输出:
$ rm ./test
$ ls
ctest.c ctest.h test.go
$ go build
$ ls
ctest.c ctest.h test test.go
$ ./test
hello from go: c function
$
关于go - `go build` 与 `go build file.go`,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48456009/