dev-cmd/unbottled: simulate target tag

Library/Homebrew/dev-cmd/unbottled.rb

@@ -44,6 +44,15 @@ module Homebrew
       Utils::Bottles.tag
     end
 
+    Homebrew::SimulateSystem.os = @bottle_tag.system
+    Homebrew::SimulateSystem.arch = if Hardware::CPU::INTEL_ARCHS.include?(@bottle_tag.arch)
+      :intel
+    elsif Hardware::CPU::ARM_ARCHS.include?(@bottle_tag.arch)
+      :arm
+    else
+      raise "Unknown arch #{@bottle_tag.arch}."
+    end
+
     all = args.eval_all?
     if args.total?
       if !all && !Homebrew::EnvConfig.eval_all?
@@ -82,6 +91,8 @@ module Homebrew
     end
 
     output_unbottled(formulae, deps_hash, noun, hash, args.named.present?)
+  ensure
+    Homebrew::SimulateSystem.clear
   end
 
   def formulae_all_installs_from_args(args, all)

Library/Homebrew/hardware.rb

@@ -9,15 +9,16 @@ module Hardware
   class CPU
     INTEL_32BIT_ARCHS = [:i386].freeze
     INTEL_64BIT_ARCHS = [:x86_64].freeze
+    INTEL_ARCHS       = (INTEL_32BIT_ARCHS + INTEL_64BIT_ARCHS).freeze
     PPC_32BIT_ARCHS   = [:ppc, :ppc32, :ppc7400, :ppc7450, :ppc970].freeze
     PPC_64BIT_ARCHS   = [:ppc64, :ppc64le, :ppc970].freeze
+    PPC_ARCHS         = (PPC_32BIT_ARCHS + PPC_64BIT_ARCHS).freeze
     ARM_64BIT_ARCHS   = [:arm64, :aarch64].freeze
+    ARM_ARCHS         = ARM_64BIT_ARCHS
     ALL_ARCHS = [
-      *INTEL_32BIT_ARCHS,
-      *INTEL_64BIT_ARCHS,
-      *PPC_32BIT_ARCHS,
-      *PPC_64BIT_ARCHS,
-      *ARM_64BIT_ARCHS,
+      *INTEL_ARCHS,
+      *PPC_ARCHS,
+      *ARM_ARCHS,
     ].freeze
 
     INTEL_64BIT_OLDEST_CPU = :core2