Build the PS1 target soft-float

[rixnobis]

The PS1 has no FPU, but the psx target is built hard-float, so string.format's %f/%e/%g path does mtc1/cvt.d.w. On a SCPH-5501 a string.format("%f", 1) probe stops dead there; built -msoft-float it runs to the end. Linking needs the soft-float libgcc, which pcsx-redux/nugget handles on its side.

Summary by CodeRabbit

• Compatibility
  • PlayStation builds now support floating-point operations on hardware without a floating-point unit, improving compatibility with the original console’s hardware. This change affects how floating-point operations are handled in the build and does not add or remove any user-facing features.

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📝 Walkthrough

Walkthrough

The PSX build adds -msoft-float to ARCHFLAGS. A comment describes software handling of %f, %e, and %g formatting.

Changes

PSX build configuration

Layer / File(s)	Summary
PSX floating-point compilation src/Makefile	Adds -msoft-float to ARCHFLAGS and documents software handling of %f, %e, and %g formatting.

Priority: ➖ Normal

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

Change: Bug fix

Merge Risk: 🔵 Low · up to 360b1

The PSX executable may link against the wrong floating-point support library. Pass the flag through the final link before merging, or confirm that the selected library is compatible.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 360b1

The change addresses floating-point formatting on PS1 hardware and does not appear to expand privileges or access to data. The matching runtime link has not been verified here, so the build integration retains some uncertainty.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The visible effect is scoped to the PSX target’s compiled floating-point behavior; downstream artifact construction and deployment exposure are not established.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: enabling soft-float for the PS1 target.
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.

✨ Finishing Touches

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/Makefile:
- Line 32: Update the `psx-luac` link configuration so the final `luac.ps-exe`
link receives `-msoft-float`; add the flag to `LDFLAGS` before including
`common.mk`, rather than relying on the library build’s `ARCHFLAGS`.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 702c2d87-eabd-4d99-bb62-d87677e9f297

📥 Commits

Reviewing files that changed from the base of the PR and between 93102f9 and 360b1cb.

📒 Files selected for processing (1)

• src/Makefile

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