Add HOMEBREW_SIMULATE_MACOS_ON_LINUX

Library/Homebrew/env_config.rb

@@ -260,6 +260,11 @@ module Homebrew
         description: "If set, use Pry for the `brew irb` command.",
         boolean:     true,
       },
+      HOMEBREW_SIMULATE_MACOS_ON_LINUX:       {
+        description: "If set, running Homebrew on Linux will simulate certain macOS code paths. This is useful " \
+                     "when auditing macOS formulae while on Linux.",
+        boolean:     true,
+      },
       HOMEBREW_SKIP_OR_LATER_BOTTLES:         {
         description: "If set along with `HOMEBREW_DEVELOPER`, do not use bottles from older versions " \
                      "of macOS. This is useful in development on new macOS versions.",

Library/Homebrew/extend/os/mac/software_spec.rb

@@ -15,7 +15,8 @@ class SoftwareSpec
     end
 
     bounds = bounds.transform_values { |v| MacOS::Version.from_symbol(v) }
-    if MacOS.version >= bounds[:since]
+    if MacOS.version >= bounds[:since] ||
+       (Homebrew::EnvConfig.simulate_macos_on_linux? && !bounds.key?(:since))
       @uses_from_macos_elements << deps
     else
       depends_on deps

Library/Homebrew/extend/os/on_os.rb

@@ -1,7 +1,7 @@
 # typed: strict
 # frozen_string_literal: true
 
-if OS.mac?
+if OS.mac? || Homebrew::EnvConfig.simulate_macos_on_linux?
   require "extend/os/mac/on_os"
 elsif OS.linux?
   require "extend/os/linux/on_os"

Library/Homebrew/extend/os/software_spec.rb

@@ -2,7 +2,7 @@
 # frozen_string_literal: true
 
 # This logic will need to be more nuanced if this file includes more than `uses_from_macos`.
-if OS.mac? || Homebrew::EnvConfig.force_homebrew_on_linux?
+if OS.mac? || Homebrew::EnvConfig.simulate_macos_on_linux?
   require "extend/os/mac/software_spec"
 elsif OS.linux?
   require "extend/os/linux/software_spec"

Library/Homebrew/formula_auditor.rb

@@ -282,7 +282,7 @@ module Homebrew
 
       # The number of conflicts on Linux is absurd.
       # TODO: remove this and check these there too.
-      return if OS.linux? && !Homebrew::EnvConfig.force_homebrew_on_linux?
+      return if OS.linux? && !Homebrew::EnvConfig.simulate_macos_on_linux?
 
       recursive_runtime_formulae = formula.runtime_formula_dependencies(undeclared: false)
       version_hash = {}

Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi

@@ -8234,6 +8234,8 @@ module Homebrew::EnvConfig
 
   def self.pry?(); end
 
+  def self.simulate_macos_on_linux?(); end
+
   def self.skip_or_later_bottles?(); end
 
   def self.sorbet_runtime?(); end