Run bazel clean without cleaning the external dependencies.

[Break Yang]

Hi all,

We currently have a huge third party dependencies called `pcl`, which takes more than 10 minutes to build. We expect it to be built once and be there for good. The problem is that when `bazel clean` is called, `pcl` (or its build status) gets cleaned as well so the next time we build something depending on it, we need to wait another 10+ minute.

In general, since external dependencies do not change (or do not change that often), is there a way to do `bazel clean` without touching them, to save some unnecessary rebuild?

Thanks a lot!

Best,

-Break

[Dmitry Lomov]

We do not have that. 

Why do you need to do `bazel clean` at all? Our aim is to make sure you never need to do bazel clean, so if you do, something is wrong.

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[Break Yang]

Thanks Dimitry! I think what we should do is trying not to use `bazel clean` at all :)

On Monday, August 28, 2017 at 3:28:15 PM UTC-7, Dmitry Lomov wrote:

We do not have that. 

Why do you need to do `bazel clean` at all? Our aim is to make sure you never need to do bazel clean, so if you do, something is wrong.

On Mon, Aug 28, 2017 at 11:43 PM, Break Yang <bre...@gmail.com> wrote:

Hi all,

We currently have a huge third party dependencies called `pcl`, which takes more than 10 minutes to build. We expect it to be built once and be there for good. The problem is that when `bazel clean` is called, `pcl` (or its build status) gets cleaned as well so the next time we build something depending on it, we need to wait another 10+ minute.

In general, since external dependencies do not change (or do not change that often), is there a way to do `bazel clean` without touching them, to save some unnecessary rebuild?

Thanks a lot!

Best,

-Break

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