remove CMakeCache before building

[pfgithub]

So it doesn't cache flags that are passed to the build

[robobun]

^{Updated 8:14 PM PT - Nov 21st, 2025}

❌ @pfgithub, your commit ed2f4aa has 3 failures in Build #32217 (All Failures):

• test/js/bun/ffi/cc.test.ts - 1 failing on 🍎 13 aarch64
• test/integration/next-pages/test/dev-server.test.ts - 1 failing on 🍎 14 aarch64
• test/v8/v8.test.ts - 1 failing on 🐧 12 x64-asan

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🧪   To try this PR locally:

bunx bun-pr 24860

That installs a local version of the PR into your bun-24860 executable, so you can run:

bun-24860 --bun

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Modifications to build configuration logic in both build.zig and scripts/build.mjs. The changes adjust object linking behavior based on OS and LLVM flags, and introduce a CMake cache cleanup step before configuration.

Changes

Cohort / File(s)	Summary
Build Configuration Logic build.zig	Modified obj.no_link_obj logic in configureObj to conditionally disable object linking based on both OS (non-Windows) and no_llvm flag state.
Build Script Pre-configuration scripts/build.mjs	Added pre-configure step to attempt deletion of buildPath/CMakeCache.txt before CMake Configure, ensuring fresh configuration state.

Possibly related PRs

• Faster linux zig build #23075: Modifies the same configureObj logic for obj.no_link_obj control flow.

Suggested reviewers

• Jarred-Sumner
• nektro
• taylordotfish

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Reviewing files that changed from the base of the PR and between 9ed5328 and ed2f4aa.

📒 Files selected for processing (2)

• build.zig (1 hunks)
• scripts/build.mjs (1 hunks)

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