cmd/gomobile: fall back to $ANDROID_NDK_HOME for the NDK path

After trying $ANDROID_HOME/ndk-bundle, we also try $ANDROID_NDK_HOME.

ANDROID_NDK_HOME is advised in this NDK sample code wiki:
https://github.com/googlesamples/android-ndk/wiki
Mentioned in the Bazel buildsystem Android app tutorial:
https://docs.bazel.build/versions/master/tutorial/android-app.html

On Ubuntu, the google-android-ndk-installer leaves the NDK in
/usr/lib/android-ndk, and it seems to be up to the user to set
ANDROID_NDK_HOME.

On Arch Linux, the android-ndk package installs the NDK into /opt/android-ndk
and sets ANDROID_NDK_HOME to there using an /etc/profile.d/file

Fixes golang/go#31461

Change-Id: I9f7f7e24b19e0047419f9725b67bd6daf2b1d328
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/171938
Run-TryBot: Elias Naur <mail@eliasnaur.com>
Reviewed-by: Elias Naur <mail@eliasnaur.com>
2 files changed
tree: e009a2f6b97dd2129726eb9b74480bfdd0ca2589
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. app/
  10. asset/
  11. bind/
  12. cmd/
  13. codereview.cfg
  14. doc/
  15. event/
  16. example/
  17. exp/
  18. geom/
  19. gl/
  20. go.mod
  21. go.sum
  22. internal/
  23. testdata/
README.md

Go support for Mobile devices

The Go mobile repository holds packages and build tools for using Go on mobile platforms.

Package documentation as a starting point:

Caution image

The Go Mobile project is experimental. Use this at your own risk. While we are working hard to improve it, neither Google nor the Go team can provide end-user support.

This is early work and installing the build system requires Go 1.5. Follow the instructions on golang.org/wiki/Mobile to install the gomobile command, build the basic and the bind example apps.


Contributions to Go are appreciated. See https://golang.org/doc/contribute.html.