Can't set custom CGO_CFLAGS and CGO_LDFLAGS with "fyne package" on darwin

[cra1nbow]

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

in Darwin, can't custom CGO_CFLAGS and CGO_LDFLAGS

go run and go build works well

How to reproduce

1. clone https://github.com/zergon321/reisen
2. install ffmpeg brew install ffmpeg --build-from-source
3. CGO_CFLAGS="-I/opt/homebrew/Cellar/ffmpeg/5.1.1/include" CGO_LDFLAGS="-L/opt/homebrew/Cellar/ffmpeg/5.1.1/lib/" go run examples/player/main.go working well
4. CGO_CFLAGS="-I/opt/homebrew/Cellar/ffmpeg/5.1.1/include" CGO_LDFLAGS="-L/opt/homebrew/Cellar/ffmpeg/5.1.1/lib/" fyne package doesn't work (because fyne overwrite CGO_CFLAGS and CGO_LDFLAGS)

Screenshots

No response

Example code

https://github.com/zergon321/reisen

Fyne version

2.2.3

Go compiler version

1.19

Operating system

macOS

Operating system version

MacOSX Ventura 13.0

Additional Information

fyne/cmd/fyne/internal/commands/build.go

Line 197 in 638ae24

env = append(env, "CGO_CFLAGS=-mmacosx-version-min=10.11", "CGO_LDFLAGS=-mmacosx-version-min=10.11")

[Aklscc]

Hi, I use an CGO_LDFLAGS on windows in Makefile:

build:
	CGO_LDFLAGS="-H=windowsgui" \
	go build -x -o $(EXE) .

And then, I got an error:
gcc.exe: error: unrecognized command line option '-H=windowsgui'; did you mean ' -mwindows'?

But If I put it in go build, run successfully.
go build -ldflags -H=windowsgui -o main.exe .

What's the difference between them?
@cra1nbow

[cra1nbow]

Hi, I use an CGO_LDFLAGS on windows in Makefile:

build:
	CGO_LDFLAGS="-H=windowsgui" \
	go build -x -o $(EXE) .

And then, I got an error: gcc.exe: error: unrecognized command line option '-H=windowsgui'; did you mean ' -mwindows'?

But If I put it in go build, run successfully. go build -ldflags -H=windowsgui -o main.exe .

What's the difference between them? @cra1nbow

I think ldflags in go build is option for golang, not CGO
CGO_LDFLAGS is injected in gcc command, -ldflags is injected in go build command

hiding windows is controlled by golang compiler, so if you want to hide gui, use -ldflags

build: go build -ldflags -H=widnowsgui -x -o $(EXE) .

[andydotxyz]

Also the windows hiding issue is completely handled by fyne package so you don't have to learn the details https://developer.fyne.io/started/packaging

[andydotxyz]

Fixed on develop ready for next release, thanks @PucklaMotzer09