app: resolve build warnings

iOS builders fail to build the mobile repository because of compile
warnings.

1. "go build golang.org/x/mobile/app" can result in build error because
   of the warning "missing [super prepareOpenGL] call".

2. "null passed to a callee that requires a non-null argument" because
   argv is expected to not be a null argument.

Resolve these warnings.

Change-Id: I86130abc3a104be388475f5c316f5c3aef13aa92
Reviewed-on: https://go-review.googlesource.com/c/mobile/+/387094
Reviewed-by: Hajime Hoshi <hajimehoshi@gmail.com>
Trust: Hajime Hoshi <hajimehoshi@gmail.com>
Run-TryBot: Changkun Ou <mail@changkun.de>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
2 files changed
tree: 28862bcb61ee7d7fe3449e294beea59768403ec1
  1. app/
  2. asset/
  3. bind/
  4. cmd/
  5. doc/
  6. event/
  7. example/
  8. exp/
  9. geom/
  10. gl/
  11. internal/
  12. testdata/
  13. .gitattributes
  14. .gitignore
  15. AUTHORS
  16. codereview.cfg
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. go.mod
  20. go.sum
  21. LICENSE
  22. PATENTS
  23. README.md
README.md

Go support for Mobile devices

Go Reference

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.