What version of Go are you using (go version)?

$ go version
go version go1.14 linux/amd64

$ gcc --version
gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0

Does this issue reproduce with the latest release?

Yes, this issue appears since Go 1.14, but did not happen with Go 1.13.8.

What operating system and processor architecture are you using (go env)?

I have Ubuntu 18.04 on a server with Xeon Gold 6240 CPU.

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/user/.cache/go-build"
GOENV="/home/user/config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/user/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build148938248=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I am executing go tool cgo -godefs x.go command on the following input:

// +build ignore

package demo

/*
#include <stdbool.h>
#include <stdint.h>
#include <sys/queue.h>

typedef struct A A;

typedef TAILQ_ENTRY(A) N;

struct A
{
  N n;
};

typedef struct B
{
  A* a;
} B;
*/
import "C"

type N C.N

type A C.A

type B C.B

What did you expect to see?

I expect to see this output. This was the output from Go 1.13.8.

// Code generated by cmd/cgo -godefs; DO NOT EDIT.
// cgo -godefs x.go

package demo

type N struct {
	Next	*A
	Prev	**A
}

type A struct {
	N N
}

type B struct {
	A *A
}

What did you see instead?

I see this output instead. Notice that in type B, the variable A has type *_Ctype_struct_A, instead of the expected type *A.

// Code generated by cmd/cgo -godefs; DO NOT EDIT.
// cgo -godefs x.go

package demo

type N struct {
	Next	*A
	Prev	**A
}

type A struct {
	N N
}

type B struct {
	A *_Ctype_struct_A
}

Further information

It seems that this problem is correlated to TAILQ_ENTRY macro. If type A does not contain a variable of a type defined by this macro, the problem does not occur.

If I manually expand the macro into the snippet below, the problem persists.

typedef struct N {
  struct A* tqe_next;
  struct A** tqe_prev;
} N;
// Go 1.14 does not work with this version.

However, if I remove struct like the snippet below, the problem disappears.

typedef struct N {
  A* tqe_next;
  A** tqe_prev;
} N;
// Go 1.14 works with this version.