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Add support for doing incremental builds

Chandan Singh requested to merge bloomberg/bst/buildstream:incremental-build into master

This functionality is only supported for sources which have an open workspace. When such sources are present, the workspace directory will be mounted directly inside the sandbox. As opposed to the default behavior, which is to copy files inside the sandbox.

This will save time when building large projects as only those files will need be re-compiled that have been modified during two consecutive builds (assuming the underlying build system supports such behavior).

A few things to note regarding this behavior:

  • If there are any configure-commands present, they will run only once for each open workspace. If an element has multiple workspaces and any one of them is opened/closed, they will be executed again on the next run. But, modifying the contents of a workspace will not trigger the configure-commands to be executed on the next run.

  • Workspaced builds still leverage the cache. So, if no changes are made to the workspace, i.e. no files are modified, then it will not force a rebuild.

Fixes #192 (closed).

Edited by Chandan Singh

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