From bf2f6ee3c44b0d2d21c569328ac733c786c4396b Mon Sep 17 00:00:00 2001
From: Jeremy Howard <github@jhoward.fastmail.fm>
Date: Mon, 31 Aug 2026 09:25:03 +1000
Subject: [PATCH] Separate fast local and optimized distribution builds

---
 .github/workflows/ci.yml |  8 ++++----
 Cargo.toml               | 12 ++++++++++++
 DEV.md                   |  2 +-
 tools/stage_binaries.py  |  5 +++--
 4 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0eda8f8..eaec393 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,13 +38,13 @@ jobs:
       - name: Stage native binary
         if: runner.os != 'Linux'
         run: |
-          cargo build --release --bins
-          python tools/stage_binaries.py
+          cargo build --profile dist --bins
+          python tools/stage_binaries.py dist
       - uses: PyO3/maturin-action@v1
         with:
-          args: --release --out dist -i python3.10 -i python3.11 -i python3.12 -i python3.13 -i python3.14
+          args: --profile dist --out dist -i python3.10 -i python3.11 -i python3.12 -i python3.13 -i python3.14
           manylinux: auto
-          before-script-linux: cargo build --release --bins && python3.10 tools/stage_binaries.py
+          before-script-linux: cargo build --profile dist --bins && python3.10 tools/stage_binaries.py dist
       - uses: actions/upload-artifact@v7
         with:
           name: wheels-${{ matrix.os }}
diff --git a/Cargo.toml b/Cargo.toml
index d49c93e..199efd7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,10 +20,22 @@ path = "src/bin/fbz.rs"
 test = false
 
 [profile.release]
+lto = false
+codegen-units = 16
+
+[profile.release.package.fbz]
+incremental = true
+
+[profile.dist]
+inherits = "release"
 lto = true
+incremental = false
 codegen-units = 1
 strip = true
 
+[profile.dist.package.fbz]
+incremental = false
+
 [dependencies]
 blake3 = "1.8.7"
 clap = { version = "4.6.6", features = ["derive"] }
diff --git a/DEV.md b/DEV.md
index 11ef5c7..96c6c5d 100644
--- a/DEV.md
+++ b/DEV.md
@@ -369,7 +369,7 @@ CI tests and builds Linux on x86-64 and ARM64, and macOS on ARM64. macOS Intel r
 
 The canonical version lives in `Cargo.toml`. `pyproject.toml` gets the Python package version from Cargo via `dynamic = ["version"]`.
 
-The thin PEP 517 backend delegates to Maturin after building and staging the native executable, so repository and editable builds contain the same native CLI as CI-built wheels. Releases publish platform wheels rather than a Python sdist; the Rust source package is published separately to crates.io.
+The thin PEP 517 backend delegates to Maturin after building and staging the native executable, so repository and editable builds contain the same native CLI as CI-built wheels. Ordinary builds use the incremental `release` profile; CI builds distributed wheels and executables with the full-LTO, single-codegen-unit, stripped `dist` profile. Releases publish platform wheels rather than a Python sdist; the Rust source package is published separately to crates.io.
 
 ## Release
 
diff --git a/tools/stage_binaries.py b/tools/stage_binaries.py
index 204040c..2222d62 100644
--- a/tools/stage_binaries.py
+++ b/tools/stage_binaries.py
@@ -1,8 +1,9 @@
-import os, shutil
+import os, shutil, sys
 from pathlib import Path
 
 root = Path(__file__).resolve().parents[1]
-source = root / "target" / "release"
+profile = sys.argv[1] if len(sys.argv) > 1 else "release"
+source = root / "target" / profile
 destination = root / "target" / "wheel-data" / "scripts"
 destination.mkdir(parents=True, exist_ok=True)
 suffix = ".exe" if os.name == "nt" else ""