Bazel is a build system that focuses on sources and dependencies rather than build instructions. It uses a high-level language to declaratively describe builds in terms of inputs and outputs, and a low-level language to encode compiler knowledge. Bazel performs reproducible, hermetic, and fast builds across platforms by executing everything in a sandboxed environment.

1. Introduction to Bazel
@mt165
mt165.co.ukMatt Turner

2. Bazel is a build system 💤

3. 🔍 Focus on your sources and their
dependencies, not build instructions

4. ☁ High-level language for declaratively
describing builds in terms of inputs and
desired outputs

5. 🕳 Low-level language (Starlark) for
encoding the knowledge of compilers

6. ⛱ Everything happens in a hermetic
sandbox

7. ♊ Byte-for-byte reproducible builds

8. ✅ Correct (re)builds

9. 🏎 Fast

11. 🚉 Great cross-platform support

12. 💻 A minimal example

13. Labels
@repo//path/to/pkg:target

14. Labels
@repo//path/to/pkg:target

15. Labels
@repo//path/to/pkg:target

16. Labels
@repo//path/to/pkg:target

17. Packages
./BUILD
./hello.go
./img/logo.png
./tests/BUILD
./tests/hello_test.go
./tests/testdata/input.txt
./tests/testdata/correct_output.txt

18. Labels
@repo//path/to/pkg:target

19. Labels
@helloworld//tests:hello_test.go

20. Labels
@helloworld//tests:test_data/input.txt

21. Labels
@helloworld//tests:helloworld_binary

22. 💻 A minimal example

23. ⬆ Upgrade golang

24. Thanks!
@mt165
Slides
Videos
Demo code
mt165.co.uk