From 53fdb6411337ec322946b65a4800f965c09b6cd8 Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Tue, 2 Aug 2022 11:02:47 +0800
Subject: [PATCH 1/3] keg_relocate (linux): prepend `gcc/lib/current` to
 `RPATH` when needed

This should help keep bottles that require GCC working when
Homebrew/homebrew-core#106755 is merged.

This only works on freshly-poured bottles. Previously installed bottles
will still break on systems with a host GCC older than GCC 11.
---
 Library/Homebrew/extend/os/linux/keg_relocate.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Library/Homebrew/extend/os/linux/keg_relocate.rb b/Library/Homebrew/extend/os/linux/keg_relocate.rb
index ee1537910cdf5..69061c11991db 100644
--- a/Library/Homebrew/extend/os/linux/keg_relocate.rb
+++ b/Library/Homebrew/extend/os/linux/keg_relocate.rb
@@ -32,6 +32,7 @@ def change_rpath(file, old_prefix, new_prefix)
 
       lib_path = "#{new_prefix}/lib"
       rpath << lib_path unless rpath.include? lib_path
+      rpath.prepend HOMEBREW_PREFIX/"opt/gcc/lib/current" if rpath.any? { |rp| rp.match?(%r{lib/gcc/\d+$}) }
 
       rpath.join(":")
     end

From 532460c098d7417a7477f7f54e790133880e8d26 Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Tue, 2 Aug 2022 13:29:14 +0800
Subject: [PATCH 2/3] keg_relocate: fix new GCC lib directory

Also add comment explaining what this line does, along with a TODO
suggesting a replacement once we've shipped the GCC PR.
---
 Library/Homebrew/extend/os/linux/keg_relocate.rb | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/extend/os/linux/keg_relocate.rb b/Library/Homebrew/extend/os/linux/keg_relocate.rb
index 69061c11991db..11a33e3cf524c 100644
--- a/Library/Homebrew/extend/os/linux/keg_relocate.rb
+++ b/Library/Homebrew/extend/os/linux/keg_relocate.rb
@@ -32,7 +32,13 @@ def change_rpath(file, old_prefix, new_prefix)
 
       lib_path = "#{new_prefix}/lib"
       rpath << lib_path unless rpath.include? lib_path
-      rpath.prepend HOMEBREW_PREFIX/"opt/gcc/lib/current" if rpath.any? { |rp| rp.match?(%r{lib/gcc/\d+$}) }
+
+      # Add GCC's lib directory (as of GCC 12+) to RPATH when there is existing linkage.
+      # This fixes linkage for newly-poured bottles.
+      # TODO: Replace with
+      #   rpath.map! { |path| path = path.sub(%r{lib/gcc/\d+$}, "lib/gcc/current") }
+      # when Homebrew/homebrew-core#106755 is merged.
+      rpath.prepend HOMEBREW_PREFIX/"opt/gcc/lib/gcc/current" if rpath.any? { |rp| rp.match?(%r{lib/gcc/\d+$}) }
 
       rpath.join(":")
     end

From 1c0eac787403884172dcd76cc0638ac89c7cee55 Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Tue, 2 Aug 2022 19:09:38 +0800
Subject: [PATCH 3/3] Exclude GCC formulae from RPATH modification for GCC

---
 Library/Homebrew/extend/os/linux/keg_relocate.rb | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/Library/Homebrew/extend/os/linux/keg_relocate.rb b/Library/Homebrew/extend/os/linux/keg_relocate.rb
index 11a33e3cf524c..7cc2f27be2169 100644
--- a/Library/Homebrew/extend/os/linux/keg_relocate.rb
+++ b/Library/Homebrew/extend/os/linux/keg_relocate.rb
@@ -35,10 +35,15 @@ def change_rpath(file, old_prefix, new_prefix)
 
       # Add GCC's lib directory (as of GCC 12+) to RPATH when there is existing linkage.
       # This fixes linkage for newly-poured bottles.
-      # TODO: Replace with
-      #   rpath.map! { |path| path = path.sub(%r{lib/gcc/\d+$}, "lib/gcc/current") }
-      # when Homebrew/homebrew-core#106755 is merged.
-      rpath.prepend HOMEBREW_PREFIX/"opt/gcc/lib/gcc/current" if rpath.any? { |rp| rp.match?(%r{lib/gcc/\d+$}) }
+      if !name.match?(Version.formula_optionally_versioned_regex(:gcc)) &&
+         rpath.any? { |rp| rp.match?(%r{lib/gcc/\d+$}) }
+        # TODO: Replace with
+        #   rpath.map! { |path| path = path.sub(%r{lib/gcc/\d+$}, "lib/gcc/current") }
+        # when
+        #   1. Homebrew/homebrew-core#106755 is merged
+        #   2. No formula has a runtime dependency on a versioned GCC (see `envoy.rb`)
+        rpath.prepend HOMEBREW_PREFIX/"opt/gcc/lib/gcc/current"
+      end
 
       rpath.join(":")
     end