cgo: cannot use C reference variable created by one package in another

[gucio321]

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

$ go version
go version go1.20.2 linux/amd64

Does this issue reproduce with the latest release?

yes

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/gucio/.cache/go-build"
GOENV="/home/gucio/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/gucio/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/gucio/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"
GOVCS=""
GOVERSION="go1.20.2"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1985314571=/tmp/go-build -gno-record-gcc-switches"

What did you do?

hi
cgo is an awesome tool.
sometimes however it is really confusing 😕
I'm trying to make a generic package used to convert GO types into C types.
The problem is that package, where I'm using converted type complains about them not being of the same type...

wrapper reference: https://github.com/gucio321/cimgui-go/blob/wrapper-extract/internal/wrapper/type_wrapper.go
project ref: gttps://github.com/gucio321/cimgui-go/tree-wrapper-extract

What did you expect to see?

as C is treated as pseudo-package (import "C") C.char/C.int should (in my opinion) be equal, shouldn't they?

What did you see instead?

cannot use text_beginArg (variable of type *wrapper._Ctype_char) as *_Ctype_char value in variable declaration

[gucio321]

here is a quick example: https://github.com/gucio321/cgo-bug

[seankhliao]

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For questions please refer to https://github.com/golang/go/wiki/Questions

[gucio321]

Unlike many projects, the Go project does not use GitHub Issues for general discussion or asking questions. GitHub Issues are used for tracking bugs and proposals only.

For questions please refer to https://github.com/golang/go/wiki/Questions

@seankhliao I know it may be a bit subjective, but I consider this a bug anyway.

[ianlancetaylor]

Dup of #13467.