ld: warning: ignoring duplicate libraries: '-lobjc'

[prologic]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

Running through the latest Fyne "Hello World" example I noticed this warning during build:

$ go build .
# hello-fyne
ld: warning: ignoring duplicate libraries: '-lobjc'

How to reproduce

1. Follow the Getting Started guide
2. Run go build .
3. Observe the ld warning

Screenshots

Example code

package main

import (
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/widget"
)

func main() {
	a := app.New()
	w := a.NewWindow("Hello World")

	w.SetContent(widget.NewLabel("Hello World!"))
	w.ShowAndRun()
}

Fyne version

2.4.3

Go compiler version

1.21.4

Operating system and version

macOS Ventura 13.6.1

Additional Information

No response

[r00tc0d3]

Same here using macOS Sonoma 14.2.1 (23C71) go version go1.21.5 darwin/arm64 using Fyne develop

[andydotxyz]

This seems to be related to Go 1.21 not Sonoma (as it does not happen with 1.20 or earlier)

[CryoByte33]

I am having the same issue on MacOS 14.3.1, Go version 1.22 and Fyne version 2.4.4.

I found this thread and this post that said it's a MacOS Sonoma linker change, and this one that lists it as a possible homebrew issue, but neither the linker flags or reinstalling every brew package on my system was able to get my Fyne project to build.

Edit: I was able to finally build properly using the following:

go run -ldflags="-extldflags=-Wl,-ld_classic,-no_warn_duplicate_libraries,-v" .

It's no longer throwing errors and I was able to start my Fyne project.

[andydotxyz]

It is just a warning and will not have stopped your project from building (that's partly why it's not been a high priority).
If you had a build error it was something else in the output than this which was the problem.

[skplunkerin]

Same issue here on my Apple M2 Pro:

MacOS Version:
Sonoma 14.3 (23D56)

Go Version:
go1.21.4 darwin/arm64

Fyne Version:
v2.4.4

[andydotxyz]

Just confirming - for you too it is just a warning and does not break the compilation or any functionality?

[skplunkerin]

Just confirming - for you too it is just a warning and does not break the compilation or any functionality?

Correct, just an unnerving warning that doesn't prevent me from using Fyne :)

[CryoByte33]

It is just a warning and will not have stopped your project from building (that's partly why it's not been a high priority). If you had a build error it was something else in the output than this which was the problem.

I replicated and you were right, it looks unrelated to my previous issue which was caused by another package's update. My bad! The message here persists without the flags posted above, though.

[XinCaoZ]

Same issue here on my Apple M3 Pro:

MacOS Version:
Sonoma 14.4 (23E214)

Go Version:
go1.22.1 darwin/arm64

Fyne Version:
v2.4.4

[XinCaoZ]

Just confirming - for you too it is just a warning and does not break the compilation or any functionality?

But I hate the error message when I compile the project.😵‍💫

[andydotxyz]

Agreed, but I think the issue is in the Go compiler, so not sure what we can do.
"-lobjc" is added by the Go compiler not the Fyne source code...