From 957c2c983cc7b09221442ef976764c96e3b0ad83 Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Mon, 19 Sep 2022 12:37:32 +0800
Subject: [PATCH] linkage_checker: ignore broken linkage with LLVM libc++.

This linkage will be broken in LLVM 15, but this is typically harmless
since dyld will load `/usr/lib/libc++.1.dylib` instead.
---
 Library/Homebrew/linkage_checker.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Library/Homebrew/linkage_checker.rb b/Library/Homebrew/linkage_checker.rb
index 0807be0fdf..ad3544ee50 100644
--- a/Library/Homebrew/linkage_checker.rb
+++ b/Library/Homebrew/linkage_checker.rb
@@ -311,9 +311,12 @@ class LinkageChecker
   def harmless_broken_link?(dylib)
     # libgcc_s_* is referenced by programs that use the Java Service Wrapper,
     # and is harmless on x86(_64) machines
+    # dyld will fall back to Apple libc++ if LLVM's is not available.
     [
       "/usr/lib/libgcc_s_ppc64.1.dylib",
       "/opt/local/lib/libgcc/libgcc_s.1.dylib",
+      # TODO: Report linkage with `/usr/lib/libc++.1.dylib` when this link is broken.
+      "#{HOMEBREW_PREFIX}/opt/llvm/lib/libc++.1.dylib",
     ].include?(dylib)
   end