Migrate to Bazel

[lupino3]

Bazel (http://bazel.io) is a fast multi-platform build system which is easier to use than Gradle/Ant.

I am trying it out in the bazel-migration branch. If it can fully supersede Gradle+Ant, we should adopt it and get rid of Gradle and Ant.

[lupino3]

Getting proper build-time variables in the manifest depends on bazelbuild/bazel#2009 being fixed.

[lupino3]

Missing features to consider the migration complete:

• build-time variables support (git revision, build timestamp)
• building the documentation
• adding Travis CI support to exercise the build
• building -nodeps JAR
• add splash screen support
• update documentation

Optional:

• adding support for building the Web UI with gwtc
• build CLI JAR

[pviotti]

@lupino3 please consider adopting a building system that is more commonly known and has better tooling support (IDEs, CI/CD, etc).
I've set up the building configuration for Gradle in this branch: https://github.com/pviotti/edumips64/tree/gradle-build
It works pretty well, doesn't need Ant, and all the configuration needed so far is gradle.build.
Currently missing features (AFAIK):

• Travis is failing on the latex to pdf task for some reason (but it works on my machine!;)
• git version stamping
• splash screen support (?)
• web ui support

[lupino3]

Hi Paolo, thanks for the bug reports and the initial code.

I like the work you did with Gradle: I think it's a better choice than Bazel at this point for a java-based desktop application like EduMIPS64.

Would you be willing to finalize the work on the Gradle build file and send a complete pull request to also remove Bazel at the same time?

Regarding the documentation: currently, the Travis build is working (https://travis-ci.org/lupino3/edumips64/builds/479339732), so the docs should build if everything is installed.

I think we should move the discussion to Issue #225, which you opened. Thanks!