`dx serve --hot-patch` fails on Windows with `linker = "rust-lld.exe"` set

[Runi-c]

Problem

Explicitly opting into lld on Windows (a practice recommended, for example, by Bevy's getting started guide) causes dx serve to fail consistently with the following errors (verbose logging):

01:16:36 [dev] Linker warnings: Linker error:
lld is a generic driver.
Invoke ld.lld (Unix), ld64.lld (macOS), lld-link (Windows), wasm-ld (WebAssembly) instead
 
01:16:36 [dev] Failed to generate fat binary: lld is a generic driver.
Invoke ld.lld (Unix), ld64.lld (macOS), lld-link (Windows), wasm-ld (WebAssembly) instead
01:16:36 [dev] Fat linking completed in 146771us
01:16:36 [dev] Setting builder to failed state
01:16:36 [dev] Build failed: The system cannot find the file specified. (os error 2)

The first error seems to suggest that rust-lld.exe isn't being called with the right semantics (to inform it what linker flavor we want).

Steps To Reproduce

Steps to reproduce the behavior:

• ensure you have rust-lld.exe:

cargo install -f cargo-binutils
rustup component add llvm-tools-preview

• create a skeleton project:

cargo new repro
cd repro

• add a .cargo/config.toml using rust-lld.exe for windows:

[target.x86_64-pc-windows-msvc]
linker = "rust-lld.exe"

• run with dx serve --hot-patch

Expected behavior

No error should occur.

Environment:

• Dioxus version: dioxus 0.7.0-rc.0 (a519fba)
• Rust version: rustc 1.90.0 (1159e78c4 2025-09-14)
• OS info: Windows 10
• App platform: desktop