Share code for sanitizing ENV between both build environments

Library/Homebrew/extend/ENV/shared.rb

@@ -14,6 +14,19 @@ module SharedEnvExtension
                           'llvm-gcc' => :llvm,
                           'clang'    => :clang }
 
+  SANITIZED_VARS = %w[
+    CDPATH GREP_OPTIONS CLICOLOR_FORCE
+    CPATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH OBJC_INCLUDE_PATH
+    CC CXX OBJC OBJCXX CPP MAKE LD LDSHARED
+    CFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS LDFLAGS CPPFLAGS
+    MACOSX_DEPLOYMENT_TARGET SDKROOT DEVELOPER_DIR
+    CMAKE_PREFIX_PATH CMAKE_INCLUDE_PATH CMAKE_FRAMEWORK_PATH
+  ]
+
+  def reset
+    SANITIZED_VARS.each { |k| delete(k) }
+  end
+
   def remove_cc_etc
     keys = %w{CC CXX OBJC OBJCXX LD CPP CFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS LDFLAGS CPPFLAGS}
     removed = Hash[*keys.map{ |key| [key, self[key]] }.flatten]

Library/Homebrew/extend/ENV/std.rb

@@ -16,12 +16,7 @@ module Stdenv
   end
 
   def setup_build_environment(formula=nil)
-    # Clear CDPATH to avoid make issues that depend on changing directories
-    delete('CDPATH')
-    delete('GREP_OPTIONS') # can break CMake (lol)
-    delete('CLICOLOR_FORCE') # autotools doesn't like this
-    %w{CPATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH OBJC_INCLUDE_PATH}.each { |k| delete(k) }
-    remove_cc_etc
+    reset
 
     if MacOS.version >= :mountain_lion
       # Mountain Lion's sed is stricter, and errors out when

Library/Homebrew/extend/ENV/super.rb

@@ -27,19 +27,10 @@ module Superenv
   end
 
   def reset
-    %w{CC CXX OBJC OBJCXX CPP MAKE LD LDSHARED
-      CFLAGS CXXFLAGS OBJCFLAGS OBJCXXFLAGS LDFLAGS CPPFLAGS
-      MACOSX_DEPLOYMENT_TARGET SDKROOT DEVELOPER_DIR
-      CMAKE_PREFIX_PATH CMAKE_INCLUDE_PATH CMAKE_FRAMEWORK_PATH
-      CPATH C_INCLUDE_PATH CPLUS_INCLUDE_PATH OBJC_INCLUDE_PATH}.
-      each{ |x| delete(x) }
-    delete('CDPATH') # avoid make issues that depend on changing directories
-    delete('GREP_OPTIONS') # can break CMake
-    delete('CLICOLOR_FORCE') # autotools doesn't like this
-
+    super
     # Configure scripts generated by autoconf 2.61 or later export as_nl, which
     # we use as a heuristic for running under configure
-    delete('as_nl')
+    delete("as_nl")
   end
 
   def setup_build_environment(formula=nil)