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Rex Hardin
Rex Hardin

Reputation: 2189

Xcode 10 build phase sequencing

What logic does Xcode's modern build system use to sequence or parallelize build phases? I realize that input/output files can be defined to sequence interdependent build phases, but is that the only consideration?

A few of the more complex projects I work on have as many as 10 run-script build phases. While I'd like to benefit from the fact that some can run in parallel, we previously leveraged the legacy build system's respect for top-down sequencing to ensure things happen in order. Are there any simple ways to ensure sequencing that don't rely on input/output files?

Upvotes: 1

Views: 860

Answers (1)

Rex Hardin
Rex Hardin

Reputation: 2189

Simply put, there's no great way.

I wound up doing a couple of things to reduce complexity:

  1. Consolidate run-script build phases into two: pre-compile, post-compile
  2. Utilize multiprocessing in Python to run groups of scripts in sequence (builds on top of in-house tooling)

I still define "output files" generated during either phase - for instance to ensure that a script-generated (or retrieved) file might be copied into the product bundle. It has reduced overhead, and improved build-times. I still think Apple needs to implement an improved mechanism for sequencing build run-script phases.

Upvotes: 1

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