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79 lines
2.6 KiB
Bash
Executable File
79 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Opt-in local build speedup for contributors (Linux x86_64):
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# - lld as the linker (via clang), instead of the default GNU ld/gold
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# - sccache as the rustc wrapper, to reuse compiled objects across
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# `cargo clean` and branch switches
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#
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# Measured on this crate (~700 dependencies): clean build 3m18s -> ~2m15s,
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# incremental single-crate rebuild 46s -> 21s.
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#
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# This only writes rust/.cargo/config.toml, which is gitignored on purpose
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# (it assumes clang/lld/sccache are installed — a bare `cargo build` must
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# keep working for anyone without them). Run this script once per machine.
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set -euo pipefail
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cd "$(dirname "${BASH_SOURCE[0]}")/.."
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CONFIG_DIR=".cargo"
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CONFIG_FILE="$CONFIG_DIR/config.toml"
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if [[ -f "$CONFIG_FILE" ]]; then
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echo "note: $CONFIG_FILE already exists — leaving it untouched."
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echo " delete it first if you want this script to regenerate it."
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exit 0
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fi
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missing=()
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if ! command -v clang >/dev/null 2>&1; then
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missing+=("clang")
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fi
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# clang echoes the tool name back unchanged (not empty) when it can't
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# resolve it internally, so "found" means the output differs from the input.
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if command -v clang >/dev/null 2>&1; then
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lld_probe="$(clang -print-prog-name=ld.lld 2>/dev/null || true)"
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if [[ "$lld_probe" == "ld.lld" ]] && ! command -v ld.lld >/dev/null 2>&1; then
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missing+=("lld")
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fi
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fi
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if (( ${#missing[@]} > 0 )); then
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echo "Missing: ${missing[*]}"
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echo "Install on Debian/Ubuntu/Kali:"
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echo " sudo apt-get install -y ${missing[*]}"
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echo "Then re-run this script."
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exit 1
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fi
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if ! command -v sccache >/dev/null 2>&1; then
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echo "sccache not found — installing via cargo (no sudo needed)..."
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cargo install sccache --locked
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fi
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if ! command -v sccache >/dev/null 2>&1; then
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cargo_bin="$HOME/.cargo/bin"
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echo "warning: sccache was installed but isn't on PATH."
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echo " Add this to your shell rc: export PATH=\"$cargo_bin:\$PATH\""
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fi
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mkdir -p "$CONFIG_DIR"
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cat > "$CONFIG_FILE" <<'EOF'
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# Generated by scripts/setup-fast-build.sh — safe to delete and regenerate.
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# lld links noticeably faster than GNU ld/gold on this crate's size (700+
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# dependency graph); clang is used as the link driver since gcc's collect2
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# can fail to locate GNU ld directly on some systems, but reliably finds lld.
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[target.x86_64-unknown-linux-gnu]
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linker = "clang"
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rustflags = ["-C", "link-arg=-fuse-ld=lld"]
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# Caches compiled objects across `cargo clean` / branch switches. No effect
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# on plain incremental rebuilds (already covered by cargo's own incremental
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# compilation + lld above). Relies on `sccache` being on PATH.
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[build]
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rustc-wrapper = "sccache"
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EOF
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echo "Wrote $CONFIG_FILE"
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echo "Try it: cargo clean && cargo build"
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