From 1b432072b5ae6a70a00464b48b7ebf8610293fc3 Mon Sep 17 00:00:00 2001
From: dweiller <4678790+dweiller@users.noreplay.github.com>
Date: Fri, 10 Mar 2023 13:03:40 +1100
Subject: [PATCH] std.Build: detect and disallow top-level step name clashes

---
 lib/std/Build.zig | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/std/Build.zig b/lib/std/Build.zig
index f23b3ba5aa..a2c8a22e32 100644
--- a/lib/std/Build.zig
+++ b/lib/std/Build.zig
@@ -926,7 +926,12 @@ pub fn step(self: *Build, name: []const u8, description: []const u8) *Step {
         }),
         .description = self.dupe(description),
     };
-    self.top_level_steps.put(self.allocator, step_info.step.name, step_info) catch @panic("OOM");
+    const gop = self.top_level_steps.getOrPut(self.allocator, name) catch @panic("OOM");
+    if (gop.found_existing) std.debug.panic("A top-level step with name \"{s}\" already exists", .{name});
+
+    gop.key_ptr.* = step_info.step.name;
+    gop.value_ptr.* = step_info;
+
     return &step_info.step;
 }