From 9b42bc1ce5a1d688aa2167a068a3b75d69888c12 Mon Sep 17 00:00:00 2001
From: Robin Voetter <robin@voetter.nl>
Date: Sun, 20 Oct 2024 16:51:15 +0200
Subject: [PATCH] spirv: start.zig support for vulkan

* Use builtin.zig_backend instead of builtin.cpu.arch, the latter
  does not yet compile under VK.
* Don't call regular _start for either opencl or vulkan. We might
  even want to disable these completely.
---
 lib/std/start.zig | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/std/start.zig b/lib/std/start.zig
index a70d9e609e..c5664cbf0f 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -19,8 +19,7 @@ pub const simplified_logic =
     builtin.zig_backend == .stage2_aarch64 or
     builtin.zig_backend == .stage2_arm or
     builtin.zig_backend == .stage2_sparc64 or
-    builtin.cpu.arch == .spirv32 or
-    builtin.cpu.arch == .spirv64;
+    builtin.zig_backend == .stage2_spirv64;
 
 comptime {
     // No matter what, we import the root file, so that any export, test, comptime
@@ -37,7 +36,7 @@ comptime {
                 if (!@hasDecl(root, "wWinMainCRTStartup") and !@hasDecl(root, "mainCRTStartup")) {
                     @export(&wWinMainCRTStartup2, .{ .name = "wWinMainCRTStartup" });
                 }
-            } else if (builtin.os.tag == .opencl) {
+            } else if (builtin.os.tag == .opencl or builtin.os.tag == .vulkan) {
                 if (@hasDecl(root, "main"))
                     @export(&spirvMain2, .{ .name = "main" });
             } else {