sharkdp/fd

Set use-jemalloc conditionally instead of ignoring it for some targets

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#1822 opened on Oct 31, 2025

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 (2 comments) (0 reactions) (0 assignees)Rust (42,984 stars) (1,059 forks)batch import
feature-requesthelp wantedpackaging/tooling

Description

src/main.rs and Cargo.toml include a complex expression to not use jemalloc on some targets even when use-jemalloc has been set explicitly. As far as I can tell most of the cases where jemalloc is disabled is due to build failures. Since cargo can be configured to use a system provided jemalloc these build failures can be avoided on some targets (in my case on 32-bit musl and riscv64). Therefor it would be nice to conditionally have use-jemalloc in the default features instead of force disabling it on some targets.

Contributor guide

Tech stack
rust
Domain
build system
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
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
RustCargo featuresconditional compilation
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Review src/main.rs and Cargo.toml to understand the current conditional disabling of jemalloc. Investigate how to define `use jemalloc` as a default feature only for targets where it builds successfully, perhaps using cfg attributes. Check existing Cargo.toml for similar conditional dependencies.