Pass args directly to prevent_build_flags.

Library/Homebrew/cli/args.rb

@@ -69,19 +69,6 @@ module Homebrew
         named.blank?
       end
 
-      # If the user passes any flags that trigger building over installing from
-      # a bottle, they are collected here and returned as an Array for checking.
-      def collect_build_args
-        build_flags = []
-
-        build_flags << "--HEAD" if HEAD?
-        build_flags << "--universal" if build_universal?
-        build_flags << "--build-bottle" if build_bottle?
-        build_flags << "--build-from-source" if build_from_source?
-
-        build_flags
-      end
-
       def formulae
         require "formula"
 

Library/Homebrew/cmd/install.rb

@@ -129,7 +129,7 @@ module Homebrew
 
     # if the user's flags will prevent bottle only-installations when no
     # developer tools are available, we need to stop them early on
-    FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
+    FormulaInstaller.prevent_build_flags(args)
 
     args.formulae.each do |f|
       # head-only without --HEAD is an error

Library/Homebrew/cmd/reinstall.rb

@@ -57,7 +57,7 @@ module Homebrew
   def reinstall
     args = reinstall_args.parse
 
-    FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
+    FormulaInstaller.prevent_build_flags(args)
 
     Install.perform_preinstall_checks
 

Library/Homebrew/cmd/upgrade.rb

@@ -70,12 +70,12 @@ module Homebrew
     named_formulae_specified = !formulae.empty? && casks.empty?
     named_casks_specified = !casks.empty? && formulae.empty?
 
-    upgrade_outdated_formulae(formulae) unless named_casks_specified
+    upgrade_outdated_formulae(formulae, args: args) unless named_casks_specified
     upgrade_outdated_casks(casks) unless named_formulae_specified
   end
 
-  def upgrade_outdated_formulae(formulae)
+  def upgrade_outdated_formulae(formulae, args:)
-    FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
+    FormulaInstaller.prevent_build_flags(args)
 
     Install.perform_preinstall_checks
 

Library/Homebrew/formula_installer.rb

@@ -95,10 +95,18 @@ class FormulaInstaller
 
   # When no build tools are available and build flags are passed through ARGV,
   # it's necessary to interrupt the user before any sort of installation
-  # can proceed. Only invoked when the user has no developer tools.
+  # can proceed. Only raises when the user has no developer tools.
-  def self.prevent_build_flags
+  def self.prevent_build_flags(args)
-    build_flags = args&.collect_build_args
+    return if DevelopmentTools.installed?
-    return if build_flags.blank?
+
+    build_flags = []
+
+    build_flags << "--HEAD" if args.HEAD?
+    build_flags << "--universal" if args.universal?
+    build_flags << "--build-bottle" if args.build_bottle?
+    build_flags << "--build-from-source" if args.build_from_source?
+
+    return if build_flags.empty?
 
     all_bottled = args.formulae.all?(&:bottled?)
     raise BuildFlagsError.new(build_flags, bottled: all_bottled)
@@ -475,7 +483,7 @@ class FormulaInstaller
 
         if req.prune_from_option?(build)
           Requirement.prune
-        elsif req.satisfied?(args: Homebrew.args)
+        elsif req.satisfied?(args: args)
           Requirement.prune
         elsif (req.build? || req.test?) && !keep_build_test
           Requirement.prune