[Bug]: Fyne doesn't compile on termux.

[DuilioPerez]

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

I've followed the instructions from your getting start page to install fyne in Termux, but I've found some issues:
1 - It can't compile programs directly for Termux:
2 - Android API level used is too low:

How to reproduce

1: Run go build in the firs example app
2: Install an app

Screenshots

1:

2:

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

fyne cli version: (devel)

Go compiler version

go version go1.23.1 android/arm64

Operating system and version

Android 11

Additional Information

No response

[andydotxyz]

Fyne version

fyne cli version: (devel)

Please list the library version not the cli.

More info:

Please share what is at line 136 of /usr/include/EGL/egl.h - the specification states that it is implementation specific but obviously for many platforms it is working, so we need to see what yours is expecting.

[andydotxyz]

Correcting title as this is compile specific. If you compiled the android app elsewhere and copied it on then it would execute as far as I can see.

[andydotxyz]

Oh, hold on - isn't termux a linux emulator for Android? In that case you should probably try "fyne package -os linux" because it's trying to build an android app from a linux terminal.

[DuilioPerez]

Oh, hold on - isn't termux a linux emulator for Android? In that case you should probably try "fyne package -os linux" because it's trying to build an android app from a linux terminal.

That command have the same error. Termux is an Android Linux emulator, but it uses bionic instead of glibc. It's default compiles for linux-android.

The content of line 136 is:
EGLAPI EGLSurface EGLAPIENTRY eglCreateWindowSurface (EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint *attrib_list);

[DuilioPerez]

And the other issue is about Android API Level too low

[DuilioPerez]

Fyne version is 2.5.1

[andydotxyz]

The content of line 136 is:
EGLAPI EGLSurface EGLAPIENTRY eglCreateWindowSurface (EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint *attrib_list);

Thanks, and what is the definition of EGLNativeWindowType on that platform (also, where is it defined?)

And the other issue is about Android API Level too low

Google Play Protect hates our backwards compatibility - it is not a problem, just a nuisance.

[DuilioPerez]

There is a related issue, maybe that information can help:
hajimehoshi/ebiten#3057

[DuilioPerez]

And with the issue related to API Level, it could be usefull to have a way to use a API Level which allow external distributions. Maybe an option on the CLI tool.

[andydotxyz]

it could be usefull to have a way to use a API Level which allow external distributions.

It is not clear what distribution is blocked by our backwards compatibility.

[DuilioPerez]

Well, it seems google play blocks apps according to the used target sdk. So isn't the minimun API Level what needs to be updated but the target sdk, acording to the Android SDK documentation, which is updated every year, so that's the only which need to be updated.

[andydotxyz]

It is not blocked - it is a warning that you can accept.

Our target SDK is above the minimum required. If it wasn't then Google would have removed the listing from the store.

"Google Play Protect" is a level above what is required by the store if I understand it correctly. Apps using the latest fyne should always be compliant with the published policies.

[andydotxyz]

That command have the same error. Termux is an Android Linux emulator, but it uses bionic instead of glibc. It's default compiles for linux-android.

Then please try setting GOOS=linux. I can tell it is compiling for
Android because it is linking to the mobile driver...