JuliaLang/PackageCompiler.jl

Add option to log which statement is being precompiled

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#867 opened on Oct 13, 2023

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Description

We're seeing a hang during create_app (https://github.com/JuliaLang/julia/issues/51603) for which we suspected a hang during type inference for a precompile(...) statement.

It these cases, it'd be helpful to be able to turn on a verbose/debug option to print which statement is being precompiled

There's a commented-out println in the code for this, so it'd just be turning that into a proper debug option https://github.com/JuliaLang/PackageCompiler.jl/blob/846292c50a7177ea27f1fdb607be8c42174e030e/src/PackageCompiler.jl#L343

Contributor guide

Tech stack
None
Domain
build systemtooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JuliaPackageCompiler.jldebug logging pattern
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
85
Research direction
The issue asks to add a debug option to log which statement is being precompiled. A commented out `println` exists at line 343 in src/PackageCompiler.jl. The contributor should implement a proper debug flag (e.g., environment variable or command line option) and conditionally print the statement. They can follow existing patterns for debug output in the codebase.