fix(darwin): update minimum macOS version from 10.15 to 12.0

[leaanthony]

Description

Updates the minimum macOS deployment target from 10.15 (Catalina) to 12.0 (Monterey) in build templates and example projects.

Since Go 1.25, the linker embeds LC_BUILD_VERSION with minos 12.0 into Mach-O binaries. This means apps built with Go 1.25+ physically cannot run on macOS < 12. The mismatch between LSMinimumSystemVersion (10.15) and the actual binary minimum (12.0) caused apps to silently crash on older macOS with no error dialog.

Setting LSMinimumSystemVersion to 12.0 ensures macOS shows a clear dialog: "MyApp" requires macOS 12 or later.

Files updated:

• updatable_build_assets/darwin/Info.plist.tmpl + Info.dev.plist.tmpl (LSMinimumSystemVersion)
• build_assets/darwin/Taskfile.yml (CGO_CFLAGS, CGO_LDFLAGS, MACOSX_DEPLOYMENT_TARGET)
• All example project build files for consistency

Not changed: Runtime @available(macOS 10.15, *) guards and the version name map in os_darwin.go — these are feature detection checks, not minimum version declarations.

Fixes #5161

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Verified only template/build files were modified, not runtime feature checks
• Confirmed no remaining 10.15 references in plist/yml files

Checklist:

• My code follows the general coding style of this project
• My changes generate no new warnings

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a844677b-056c-4bca-8a22-64d5b6a47b5a

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/5161-mac-min-build-version

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}