linkage_checker: add broken_linkage_allowlist

Library/Homebrew/linkage_checker.rb

@@ -92,6 +92,20 @@ def dylib_to_dep(dylib)
  Regexp.last_match(2)
  end
 
+ sig { params(file: Pathname).returns(T::Boolean) }
+ def broken_linkage_allowed?(file)
+ @broken_linkage_allowed ||= case (allowed = formula.tap&.audit_exception(:broken_linkage_allowlist, formula.name))
+ when String
+ [allowed]
+ when Array
+ allowed
+ else
+ []
+ end
+ glob_flags = File::FNM_DOTMATCH | File::FNM_EXTGLOB | File::FNM_PATHNAME
+ @broken_linkage_allowed.any? { |pattern| file.fnmatch?("#{formula.prefix.realpath}/#{pattern}", glob_flags) }
+ end
+
  def check_dylibs(rebuild_cache:)
  keg_files_dylibs = nil
 
@@ -128,7 +142,7 @@ def check_dylibs(rebuild_cache:)
  if !file_has_any_rpath_dylibs && (dylib.start_with? "@rpath/")
  file_has_any_rpath_dylibs = true
  pathname = Pathname(file)
- @files_missing_rpaths << file if pathname.rpaths.empty?
+ @files_missing_rpaths << file if pathname.rpaths.empty? && !broken_linkage_allowed?(pathname)
  end
 
  next if checked_dylibs.include? dylib
@@ -156,7 +170,7 @@ def check_dylibs(rebuild_cache:)
  # If we cannot associate the dylib with a dependency, then it may be a system library.
  # If dlopen finds the dylib, then the linkage is not broken.
  @system_dylibs << dylib
- elsif !system_framework?(dylib)
+ elsif !system_framework?(dylib) && !broken_linkage_allowed?(Pathname(file))
  @broken_dylibs << dylib
  end
  else