When comparing Ninja vs Bazel, the Slant community recommends Ninja for most people. In the question“What are the best open-source build systems for C/C++?” Ninja is ranked 1st while Bazel is ranked 8th. The most important reason people chose Ninja is:
Once dependencies like maven are installed it is up and running in minutes with one simple command.
Specs
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Pros
Pro Simple set up
Once dependencies like maven are installed it is up and running in minutes with one simple command.
Pro Easy horizontal scaling
Ninja is stateless by design. This makes horizontal scaling very easy and just a matter of adding servers.
Pro Correct and repeatable builds
Builds only use input files that are explicitly declared in the build specification. On Linux, Bazel runs tools in a sandboxed environment that contain only the minimum necessary files required.
Pro Fast even at scale
Even at large scale it's pretty fast (it's based on what Google uses internally for their huge code base).
Pro Can rule shell commands
Pro Handles mixed language builds
Pro High level build descriptions
Pro Build rule errors are informative
When builds fail because of an issue in the build rules, the errors provided are usually very informative and helpful to resolve the issue.
Pro Good IDE support
Pro Standard protocol for remote execution and caching
Pro Remote execution of commands
Cons
Con Little user choice in organization
Since most of the code and folder structure are automatically generated, this leaves little room to the developer on how they will organize their project.
Con Draconian sandboxing, explicit inputs requirement
Requirement to explicitly name all inputs disqualifies Bazel for many workflows, e.g. those relying on tools that scan a directory tree themselves looking for files to process. Sandboxing as implemented in Bazel imposes further restrictions. If a command is successful when you type it in the shell, it should also be successful when pasted verbatim into a rule, but with Bazel it very often isn't.
Con Confusing for beginners
With so many capabilities, trying to implement with a simple project is overkill and unpleasant.