formula: move cxxstdlib methods to the class.

This allows disabling this checks when e.g. pouring bottles.

Library/Homebrew/compat/formula.rb

@@ -16,6 +16,14 @@ class Formula
     "-DCMAKE_INSTALL_PREFIX='#{prefix}' -DCMAKE_BUILD_TYPE=None -DCMAKE_FIND_FRAMEWORK=LAST -Wno-dev"
   end
 
+  def cxxstdlib
+    self.class.cxxstdlib
+  end
+
+  def cxxstdlib_check check_type
+    self.class.cxxstdlib_check check_type
+  end
+
   def self.bottle_sha1(*)
   end
 

Library/Homebrew/cxxstdlib.rb

@@ -33,7 +33,7 @@ class CxxStdlib
   end
 
   def check_dependencies(formula, deps)
-    unless formula.cxxstdlib.include? :skip
+    unless formula.class.cxxstdlib.include? :skip
       deps.each do |dep|
         # Software is unlikely to link against anything from its
         # buildtime deps, so it doesn't matter at all if they link

Library/Homebrew/formula.rb

@@ -439,12 +439,6 @@ class Formula
     Requirement.expand(self, &block)
   end
 
-  # Flag for marking whether this formula needs C++ standard library
-  # compatibility check
-  def cxxstdlib
-    @cxxstdlib ||= Set.new
-  end
-
   def to_hash
     hsh = {
       "name" => name,
@@ -607,12 +601,6 @@ class Formula
     active_spec.patches.each(&:apply)
   end
 
-  # Explicitly request changing C++ standard library compatibility check
-  # settings. Use with caution!
-  def cxxstdlib_check check_type
-    cxxstdlib << check_type
-  end
-
   def self.method_added method
     case method
     when :brew
@@ -730,6 +718,18 @@ class Formula
       @keg_only_reason = KegOnlyReason.new(reason, explanation.to_s.chomp)
     end
 
+    # Flag for marking whether this formula needs C++ standard library
+    # compatibility check
+    def cxxstdlib
+      @cxxstdlib ||= Set.new
+    end
+
+    # Explicitly request changing C++ standard library compatibility check
+    # settings. Use with caution!
+    def cxxstdlib_check check_type
+      cxxstdlib << check_type
+    end
+
     # For Apple compilers, this should be in the format:
     # fails_with compiler do
     #   cause "An explanation for why the build doesn't work."