Merge pull request #13631 from carlocab/gcc-rpaths

keg_relocate (linux): prepend `gcc/lib/current` to `RPATH` when needed

Library/Homebrew/extend/os/linux/keg_relocate.rb

@@ -33,6 +33,18 @@ def change_rpath(file, old_prefix, new_prefix)
       lib_path = "#{new_prefix}/lib"
       rpath << lib_path unless rpath.include? lib_path
 
+      # Add GCC's lib directory (as of GCC 12+) to RPATH when there is existing linkage.
+      # This fixes linkage for newly-poured bottles.
+      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
     updated[:rpath] = new_rpath if old_rpath != new_rpath