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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.

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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.

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