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I thought Google was all about Bazel these days. Anyone know why Google is pushing two apparently competing build systems?

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Only two? There are more than that. For example, Android Studio uses Gradle. Go and Dart have their own build systems as well.

It might be because Google is a big company doing many things in many languages, Bazel was only open sourced recently, and so on.

Don't forget Chromium which itself has two meta build systems (gyp and gn - similar to bazel/cmake/etc.) along with an underlying build system (ninja) which can target multiple compilers and runtimes on different platforms.

P.S. Chromium is in the middle of a transition from gyp to gn[1] which is why it has two build systems.

[1] https://chromium.googlesource.com/chromium/src/+/master/tool...

Also google doesn't give a shit about the developers that have to use the tools.

Good to hear the move away from gyp. The hand tuned build scripts (VS/nmake/make) before gyp were better.

Bazel is blaze released to the public. Android never used blaze because it had to be built by people outside Google. Different worlds.

Right, but Bazel is public, so why not use that?

because ninja launched years before blaze, and the team didn't want to switch again?

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