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cmd/cgo: cgo package call C system function error #20816

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dzhwinter opened this issue Jun 27, 2017 · 1 comment

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@dzhwinter
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commented Jun 27, 2017

throw an exception of

could not determine kind of name for C.memcpy

here is the source code to reproduce the bug

package main

/*
#include <string.h>
#include <stdlib.h>
*/

import "C"

import (
  "fmt"
  "unsafe"
)

func main() {
  record := (**C.uchar)(unsafe.Pointer(uintptr(0)))
  // var record **C.uchar
  buf := []byte{1, 2, 3}
  fmt.Println(buf)
  size := C.int(len(buf))
  *record = (*C.uchar)(C.malloc(C.size_t(len(buf))))
  fmt.Println(*record)
  C.memcpy(unsafe.Pointer(*record), unsafe.Pointer(&buf[0]), C.size_t(len(buf)))

}
go version go1.8.3 darwin/amd64
macos Sierra
10.12 (16A323)
@bradfitz

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commented Jun 27, 2017

Remove the blank line between your import "C" and the comment preceding it.

See https://golang.org/pkg/cmd/cgo/

@bradfitz bradfitz closed this Jun 27, 2017

@mikioh mikioh changed the title [cgo] cgo package call C system function error cmd/cgo: cgo package call C system function error Aug 2, 2017

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