Adam Perry @ OpenAI 0b08bbb9d9 [codex] Provide ARM64 MinGW powl compatibility support (#27323) ...

## Why

Windows ARM64 uses 64-bit `long double`, but the LLVM MinGW Bazel
configuration omits the upstream `powl` compatibility source and does
not link the `mingwex` archive that owns it. Cross-linking the release
binary therefore fails with an unresolved `powl` symbol.

## What changed

Patch the LLVM module to compile `math/arm-common/powl.c` into the ARM64
MinGW extension sources and add `-lmingwex` to the Windows toolchain
defaults.

## Validation

- `just bazel-lock-check`

Stack: 3 of 6. Depends on #27322.

2026-06-11 11:21:47 -07:00

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