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

$ go version
go version go1.14.2 linux/amd64

Does this issue reproduce with the latest release?

The issue is reproduced on any go1.14+ and not reproduced on go1.13.10 and below

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

$ go env
GO111MODULE=""

GOARCH="amd64"

GOBIN=""

GOCACHE="/home/yalegko/.cache/go-build"

GOENV="/home/yalegko/.config/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOINSECURE=""

GONOPROXY=""

GONOSUMDB=""

GOOS="linux"

GOPATH="/home/yalegko/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-build064772607=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Use a typedef on anonymous struct in cgo:

package main

/*
	typedef struct {
		int i;
	} A, *PA;
*/
import "C"
import "fmt"

func main() {
	var a C.PA = &C.A{
		i: 1,
	}
	fmt.Printf("%#v\n", a)
}

Then just build it:

go build -a .

What did you expect to see?

Nothing and successfully compiled binary

What did you see instead?

# _/tmp/tst
./tst.go:12:6: cannot use &_Ctype_struct___0 literal (type *_Ctype_struct___0) as type _Ctype_PA in assignment

Additional info

According to _cgo_gotypes.go it looks like compiler can't understand that *A and PA is the same type and generates 2 identically structures for them.

The issue is not reproduced neither for named strucutres, e.g.

typedef struct a {
	int i;
} A, *PA;

nor for 2 separate typedefs:

typedef struct a {
	int i;
} A;
typedef A *PA;