[aiuto]

Being written in Java is essentially a non-issue. Bazel ships as a binary that self-extracts a JRE for its own use. You don't have to install Java unless you want to build Java apps.

The real issue for highly reusable products like Qt is portability of the build tool. CMake works on the long tail of OSes, some of which do not have any usable JRE available. That limits the ability to use Bazel as the only build tool.

For Bazel to be useful to projects like Qt (and other horizontal libraries like openssl, ICU, curl, ...) one would need a system for generating CMakefiles from BUILD files. The developers of those apps could use Bazel to improve build and test scaling, and then generate CMake (or other build tool) files as part of their packaging and distribution. I don't propose that this is an easy thing to do - all rules would need translation into other languages - just that it is a path which may benefit some projects.