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Use ICF in macOS release builds to reduce binary sizes #19615

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Merged
zanieb merged 10 commits into from
Jun 9, 2026
+12 −0
Merged

Use ICF in macOS release builds to reduce binary sizes #19615

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7f8abba
Use ICF in release builds
zanieb May 29, 2026
c206ad3
Move Linux ICF flags into release matrix
zanieb May 29, 2026
808b2e5
Drop Linux ICF without size improvement
zanieb May 29, 2026
26a7b49
Use bundled LLD for Linux ICF
zanieb Jun 1, 2026
b584604
Scope Linux ICF flags to release target
zanieb Jun 1, 2026
05e88e7
Temporarily disable ICF for baseline measurement
zanieb Jun 2, 2026
0d38a8e
Revert "Temporarily disable ICF for baseline measurement"
zanieb Jun 2, 2026
b568ed9
Scope ICF to macOS release builds
zanieb Jun 8, 2026
f22e8e1
Clarify macOS ICF comments
zanieb Jun 8, 2026
c91cff9
Refine macOS ICF size comments
zanieb Jun 8, 2026
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12 changes: 12 additions & 0 deletions .github/workflows/build-release-binaries.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,9 @@ jobs:
args: --release --locked --out dist --features self-update --compatibility pypi
env:
CARGO: ${{ github.workspace }}/scripts/cargo.sh
# Use Rust's bundled Mach-O LLD, which supports ICF.
# ICF reduces the macOS x86_64 uv binary size by ~2%.
RUSTFLAGS: "-C linker=rust-lld -C linker-flavor=ld64.lld -C link-arg=--icf=safe"
- name: "Upload wheels"
uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
with:
Expand Down Expand Up @@ -145,6 +148,9 @@ jobs:
args: --profile minimal-size --locked --out crates/uv-build/dist -m crates/uv-build/Cargo.toml --compatibility pypi
env:
CARGO: ${{ github.workspace }}/scripts/cargo.sh
# Use Rust's bundled Mach-O LLD, which supports ICF.
# ICF reduces the macOS x86_64 uv-build binary size by ~0.7%.
RUSTFLAGS: "-C linker=rust-lld -C linker-flavor=ld64.lld -C link-arg=--icf=safe"
- name: "Upload wheels uv-build"
uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
with:
Expand Down Expand Up @@ -179,6 +185,9 @@ jobs:
args: --release --locked --out dist --features self-update --compatibility pypi
env:
CARGO: ${{ github.workspace }}/scripts/cargo.sh
# Use Rust's bundled Mach-O LLD, which supports ICF.
# ICF reduces the macOS aarch64 uv binary size by ~1.4%.
RUSTFLAGS: "-C linker=rust-lld -C linker-flavor=ld64.lld -C link-arg=--icf=safe"
- name: "Test wheel - aarch64"
run: |
pip install ${PACKAGE_NAME} --no-index --find-links dist/ --force-reinstall
Expand Down Expand Up @@ -218,6 +227,9 @@ jobs:
args: --profile minimal-size --locked --out crates/uv-build/dist -m crates/uv-build/Cargo.toml --compatibility pypi
env:
CARGO: ${{ github.workspace }}/scripts/cargo.sh
# Use Rust's bundled Mach-O LLD, which supports ICF.
# ICF reduces the macOS aarch64 uv-build binary size by ~0.7%.
RUSTFLAGS: "-C linker=rust-lld -C linker-flavor=ld64.lld -C link-arg=--icf=safe"
- name: "Test wheel - aarch64"
run: |
pip install ${PACKAGE_NAME}_build --no-index --find-links crates/uv-build/dist --force-reinstall
Expand Down
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