Windows 11 compilation configurations

[will-hart]

I've had a bit of trouble getting hot reload to work in Windows 11, with a relatively empty bevy app. I tried lots of different configurations and I think I have a working configuration. I thought I'd share in case anybody else finds it useful. I'm not sure if any of these issues represent dx bugs (maybe error 2?).

rustc	linker override	flags	Cargo Config	Initial Compile	Hot Patch Compile
1.89	none specified	-Zshare-generics=n -Zthreads=0	codegen-units = 1	Succeeds	Succeeds
1.89	rust-lld	-Zshare-generics=n -Zthreads=0	-	Fail, #4191	N/A
1.89	rust-lld	-	codegen-units = 1	Fail, Error 1	N/A
1.89	lld-link	-Zshare-generics=n -Zthreads=0	-	Fail, #4191	N/A
1.89	lld-link	-Zshare-generics=n -Zthreads=0	codegen-units = 1	Succeeds	Fail, Error 2
1.86	rust-lld	-	codegen-units = 1	Fail, Error 1	N/A
1.86	lld-link	-	codegen-units = 1	Succeeds	Fail, Error 2

Error 1

[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
[dev] Build failed: I/O Error: The system cannot find the file specified. (os error 2)

Error 2

[dev] Linker warnings: Linker error:
lld-link: error: could not open '/NOLOGO

I may have gotten some of the settings wrong, but at 10-15 minutes per test I don't want to repeat any 😁

Initial compilation takes about 8 minutes and recompilation on change takes about 1 minute. The times are pretty similar with cargo run.

Environment:

[email protected]

nightly

rustc 1.89.0-nightly (1bbd62e54 2025-05-29)
binary: rustc
commit-hash: 1bbd62e547ba5cc08ccb44c27def3d33195d2dd5
commit-date: 2025-05-29
host: x86_64-pc-windows-msvc
release: 1.89.0-nightly
LLVM version: 20.1.5

and stable

rustc 1.86.0 (05f9846f8 2025-03-31)
binary: rustc
commit-hash: 05f9846f893b09a1be1fc8560e33fc3c815cfecb
commit-date: 2025-03-31
host: x86_64-pc-windows-msvc
release: 1.86.0
LLVM version: 19.1.7