fix(link): pass -lm on the Linux application-dylib link

[proggeramlug]

LLVM lowers Math.floor/Math.log10 in application code to libm calls (floor, log10). Perry's --output-type dylib link on Linux does not add -lm (its executable link does — link/build_and_run.rs), and macOS never notices because libSystem carries libm. On the fresh Linux box the Next fixture's link died with

undefined reference to 'floor'   (perry_closure_…route_js__149, …jsonwebtoken…, …app_page_runtime…)
undefined reference to 'log10'

after every other symbol resolved — it surfaced the moment PerryTS/perry#8942 removed the duplicate string-constant definitions. The tiny fixture the Linux proof compiles calls no libm function, which is why CI never saw it.

Coop's cc shim now passes -lm on the Linux shared-library branch. The compiler-side fix (add the system libraries to Perry's Linux -shared link, as its executable link already does) is being added to PerryTS/perry#8942; this shim change is the defensive half and stays correct either way.

Verified on the Linux box: with this change (and PerryTS/perry#8942's string-constant fix) the fixture links and publishes (app.so, 362 s end to end). The three-app in_process table is not yet possible there: the daemon SIGSEGVs during the app's module init (js_throw → _Unwind_RaiseException, independent of these link flags) — tracked separately.

https://claude.ai/code/session_01UZJbhb2FTuakurTHPAKQgd

Summary by CodeRabbit

• Bug Fixes
  • Fixed Linux builds involving mathematical operations such as floor and log10.
  • Improved shared-library linking so required math functions resolve correctly.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 39727ada-f4f5-4f27-9c7a-c134bc3ba7f0

📥 Commits

Reviewing files that changed from the base of the PR and between 3bb8e3d and dcebf48.

📒 Files selected for processing (1)

• scripts/compiler-wrappers/cc

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📝 Walkthrough

Walkthrough

The Linux compiler wrapper now adds -lm when linking shared libraries. The macOS branch remains unchanged.

Changes

Linux shared-library linking

Layer / File(s)	Summary
Add libm to the Linux link command scripts/compiler-wrappers/cc	The Linux shared-library link passes -lm before the --no-as-needed and --as-needed provider arguments. This resolves LLVM-emitted math symbols such as floor and log10.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to dcebf

This change adds libm when building Linux shared libraries so application math functions link correctly. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding -lm to the Linux application dynamic-library link.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/linux-app-link-libm

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