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Nightly: fix Mac ARM64 build by targeting macOS 13.3 for std::format (#10075)

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The Nightly **Mac ARM64 Build** job fails on current Xcode/libc++
because `std::format` pulls floating-point formatting paths that require
`std::to_chars` availability from macOS 13.3+. The job was still
compiling with a 13.0 deployment target.

- **Root cause**
  - ARM64 nightly job used:
    - `MACOSX_DEPLOYMENT_TARGET=13.0`
    - `mk_unix_dist.py --os=osx-13.0`
- This mismatched the effective libc++ requirements in the runner
toolchain.

- **Workflow change**
  - Updated only `.github/workflows/nightly.yml` for `mac-build-arm64`:
    - `MACOSX_DEPLOYMENT_TARGET: "13.0" -> "13.3"`
    - `--os=osx-13.0 -> --os=osx-13.3`

- **Resulting behavior**
- ARM64 nightly build target now aligns with the minimum OS level
required by the formatting code paths used by current compilation units.

```yaml
# .github/workflows/nightly.yml (mac-build-arm64)
env:
  MACOSX_DEPLOYMENT_TARGET: "13.3"

- name: Build
  run: python scripts/mk_unix_dist.py --dotnet-key=$GITHUB_WORKSPACE/resources/z3.snk --arch=arm64 --os=osx-13.3
```

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
This commit is contained in:
Copilot 2026-07-09 08:45:51 -07:00 • committed by GitHub
parent 2c16f44c0a
commit 5a55ed7cfb
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.github/workflows/nightly.yml vendored
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@ -72,7 +72,7 @@ jobs:
runs-on: macos-latest
timeout-minutes: 90
env:
MACOSX_DEPLOYMENT_TARGET: "13.0"
MACOSX_DEPLOYMENT_TARGET: "13.3"
steps:
- name: Checkout code
uses: actions/checkout@v7.0.0
@ -83,7 +83,7 @@ jobs:
python-version: '3.x'
- name: Build
run: python scripts/mk_unix_dist.py --dotnet-key=$GITHUB_WORKSPACE/resources/z3.snk --arch=arm64 --os=osx-13.0
run: python scripts/mk_unix_dist.py --dotnet-key=$GITHUB_WORKSPACE/resources/z3.snk --arch=arm64 --os=osx-13.3
- name: Validate libz3.dylib and z3 architecture (must be arm64)
run: |