From 983dea90c169930e35721232afe39fd4e3fbe4a6 Mon Sep 17 00:00:00 2001
From: Paul E. Murphy <murp@ibm.com>
Date: Tue, 27 Apr 2021 15:05:51 -0500
Subject: [PATCH] cmd/link: disable plugin support if cgo is disabled

Functional plugin support requires cgo to be enabled. Disable
it if the environment has disabled cgo.

This prevents unexpected linker failures when linking large
binaries with cgo disabled which use the plugin package.

Fixes #45564

Change-Id: Ib71f0e089f7373b7b3e3cd53da3612291e7bc473
Reviewed-on: https://go-review.googlesource.com/c/go/+/314449
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
---

diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index adf1669..043bf5a 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -539,7 +539,10 @@
 	// up symbol by name may not get expected result.
 
 	iscgo = ctxt.LibraryByPkg["runtime/cgo"] != nil
-	ctxt.canUsePlugins = ctxt.LibraryByPkg["plugin"] != nil
+
+	// Plugins a require cgo support to function. Similarly, plugins may require additional
+	// internal linker support on some platforms which may not be implemented.
+	ctxt.canUsePlugins = ctxt.LibraryByPkg["plugin"] != nil && iscgo
 
 	// We now have enough information to determine the link mode.
 	determineLinkMode(ctxt)