My global config.toml setup for ultra fast Rust compile times

config.toml

[unstable]
codegen-backend = true

[profile]
incremental = true

[profile.dev]
codegen-backend = "cranelift"
# If you want to attach a debugger, set this to true
debug = "line-tables-only"

# Consider compiling deps with cranelift if you want cold-compilation to be faster
[profile.dev.package."*"]
codegen-backend = "llvm"

# cranelift is `panic = abort`, so you need to compile with llvm to get `#[should_panic]` working
[profile.test.package."*"]
codegen-backend = "llvm"

# Disable cranelift for release profile
[profile.release]
codegen-backend = "llvm"

# cranelift cannot build wasm32-unknown-unknown out of the box
[profile.web]
codegen-backend = "llvm"

[build]
# Requires setting `CARGO=$(rustup which --toolchain nightly-2025-06-26 cargo)` or it breaks `Bevy CLI`:
# https://github.com/TheBevyFlock/bevy_cli/blob/main/docs/src/linter/troubleshooting.md#using-with-sccache
rustc-wrapper = "/home/hhh/.cargo/bin/sccache"
# Using a global target dir allows all projects to share incremental compilation results,
# vastly speeding up cold-compilation of new projects.
target-dir = "/home/hhh/.cargo/global-target"

[target.x86_64-unknown-linux-gnu]
linker = "clang"
rustflags = [
    "-Clink-arg=-fuse-ld=mold",

    # Nightly
    "-Zshare-generics=y",
    "-Zthreads=8",
]
rustdocflags = [
    "-Clink-arg=-fuse-ld=mold",
    # Nightly
    "-Zshare-generics=y",
    "-Zthreads=8",
]

[target.wasm32-unknown-unknown]
# We cannot really change the linker for wasm32-unknown-unknown
rustflags = [
    "--cfg",
    "getrandom_backend=\"wasm_js\"",
    # Nightly
    "-Zshare-generics=y",
    "-Zthreads=8",
]
rustdocflags = [
    "--cfg",
    "getrandom_backend=\"wasm_js\"",
    # Nightly
    "-Zshare-generics=y",
    "-Zthreads=8",
]

requires

• Linux
• nightly
• cranelift
• sccache
• mold
• clang