From fffda6b3adfb4d05290c58939a78a99643398ff1 Mon Sep 17 00:00:00 2001
From: Cherry Mui <cherryyz@google.com>
Date: Thu, 10 Nov 2022 17:17:54 -0500
Subject: [PATCH] cmd/link: exit if runtime.a is missing

Many stages in the linker assume some runtime symbols exist.
Error out if the runtime package cannot be found.

Fixes #56685.

Change-Id: I39b2663f6d7419688e30e6d8650e5eb8fc43a2b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/449638
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 src/cmd/link/internal/ld/lib.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index 89bd966f59..184ad20be4 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -466,6 +466,9 @@ func loadinternal(ctxt *Link, name string) *sym.Library {
 		}
 	}
 
+	if name == "runtime" {
+		Exitf("error: unable to find runtime.a")
+	}
 	ctxt.Logf("warning: unable to find %s.a\n", name)
 	return nil
 }
-- 
2.50.0