Use mimalloc when targeting musl

Cargo.lock

@@ -2223,6 +2223,16 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "libmimalloc-sys"
+version = "0.1.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23aa6811d3bd4deb8a84dde645f943476d13b248d818edcf8ce0b2f37f036b44"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "libredox"
 version = "0.0.2"
@@ -2339,6 +2349,15 @@ dependencies = [
  "paste",
 ]
 
+[[package]]
+name = "mimalloc"
+version = "0.1.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68914350ae34959d83f732418d51e2427a794055d0b9529f48259ac07af65633"
+dependencies = [
+ "libmimalloc-sys",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -2849,6 +2868,7 @@ dependencies = [
  "crossterm",
  "enable-ansi-support",
  "memmap2",
+ "mimalloc",
  "objdiff-core",
  "prost",
  "ratatui",

objdiff-cli/Cargo.toml

@@ -28,3 +28,6 @@ supports-color = "3.0"
 time = { version = "0.3", features = ["formatting", "local-offset"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+[target.'cfg(target_env = "musl")'.dependencies]
+mimalloc = "0.1"

objdiff-cli/src/main.rs

@@ -2,6 +2,12 @@ mod argp_version;
 mod cmd;
 mod util;
 
+// musl's allocator is very slow, so use mimalloc when targeting musl.
+// Otherwise, use the system allocator to avoid extra code size.
+#[cfg(target_env = "musl")]
+#[global_allocator]
+static ALLOC: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
 use std::{env, ffi::OsStr, fmt::Display, path::PathBuf, str::FromStr};
 
 use anyhow::{Error, Result};