So everyone is talking about bazel now, but migration to it isn't automated (gradle is better in this regard when migrating from maven). So I don't want to invest time into manually converting any repository to it.
But I can't find any information about build speed difference between recent versions of gradle (5.6 >) and bazel (1.0).
Can anyone share a link or his own experience? I'm mostly interested in incremental builds where just a couple of files have changed.
Okay, I've migrated closed source project containing ~100_000 loc of Java to Bazel.
As I've said my interest is about developer productivity and hence about incremental builds.
I've used the following in BUILD for Bazel so I haven't used most granular approach because I don't think it's really maintainable and that anybody except big companies with a lot of DevOps could use that. And in any case I see the fact that I would need to do this manually to improve build speed as a downside of Bazel.
java_binary(
srcs = glob(["src/main/java/**/*.java"]),
resources = glob(["src/main/resources/**"]),
...
)
I've tried that multiple times and each time Gradle was significantly faster. I haven't tested incremental build when more than one or two files have been changed, maybe in that scenario Bazel would be the same or faster than Gradle.
So speed-wise Gradle seems to be the winner for developer productivity. Bazel have more safe defaults (error-prone is on by default) in Gradle you have to enable it yourself, but IMHO the flexibility of Gradle outweighs more safe defaults of Gazel.