From d3363b7a61cc0833d6eb60077b90cf12b95155f0 Mon Sep 17 00:00:00 2001
From: Ryan Liptak <squeek502@hotmail.com>
Date: Sat, 28 Jun 2025 18:30:39 -0700
Subject: [PATCH] Replace `unreachable` with error return for non-standard
 Windows targets

This new error mirrors the error returned from the Elf struct (error.UnsupportedElfArchitecture):

https://github.com/ziglang/zig/blob/0adcfd60f4fcfd01c74a6477cbcef187ce06f533/src/link/Lld.zig#L112

Before:

```
$ zig build-exe -target riscv64-windows-gnu main.zig
thread 543087 panic: reached unreachable code
```

After:

```
$ zig build-exe -target riscv64-windows-gnu main.zig
error: unable to create compilation: UnsupportedCoffArchitecture
```

Closes #24287
---
 src/link/Lld.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/link/Lld.zig b/src/link/Lld.zig
index 45ef112dc4..4b3c611b4a 100644
--- a/src/link/Lld.zig
+++ b/src/link/Lld.zig
@@ -37,12 +37,12 @@ const Coff = struct {
                 .Exe => switch (target.cpu.arch) {
                     .aarch64, .x86_64 => 0x140000000,
                     .thumb, .x86 => 0x400000,
-                    else => unreachable,
+                    else => return error.UnsupportedCoffArchitecture,
                 },
                 .Lib => switch (target.cpu.arch) {
                     .aarch64, .x86_64 => 0x180000000,
                     .thumb, .x86 => 0x10000000,
-                    else => unreachable,
+                    else => return error.UnsupportedCoffArchitecture,
                 },
                 .Obj => 0,
             },