Avoid globals when ivars will do

Library/ENV/4.3/cc

@@ -25,9 +25,13 @@ end
 LOGGER = Logger.new
 
 class Cmd
+  attr_reader :brewfix, :sdkroot
+
   def initialize path, args
     @arg0 = File.basename(path).freeze
     @args = args.freeze
+    @brewfix = ENV['HOMEBREW_PREFIX']
+    @sdkroot = ENV['HOMEBREW_SDKROOT']
   end
   def mode
     if @arg0 == 'cpp' or @arg0 == 'ld'
@@ -74,9 +78,9 @@ class Cmd
       refurbished_args
     end
     if tool != 'ld'
-      args << "--sysroot=#$sdkroot"
+      args << "--sysroot=#{sdkroot}"
     else
-      args << "-syslibroot" << $sdkroot
+      args << "-syslibroot" << sdkroot
     end if nclt?
     allflags = case mode
     when :ccld
@@ -133,7 +137,7 @@ class Cmd
       when /^-L(.+)/
         path = $1.chuzzle || whittler.next
         doit = case path.cleanpath
-        when %r{^#$brewfix}
+        when %r{^#{brewfix}}
           # maybe homebrew is installed to /sw or /opt/brew
           true
         when %r{^/opt}, %r{^/sw}, %r{/usr/X11}
@@ -180,7 +184,7 @@ class Cmd
   end
   def syspath
     if nclt?
-      %W{#$sdkroot/usr #$sdkroot/usr/local}
+      %W{#{sdkroot}/usr #{sdkroot}/usr/local}
     else
       %W{/usr /usr/local}
     end
@@ -189,7 +193,7 @@ class Cmd
     # We reject brew's lib as we explicitly add this as a -L flag, thus it
     # is given higher priority by cc, so it surpasses the system libpath.
     # NOTE this only counts if Homebrew is installed at /usr/local
-    syspath.map{|d| "#{d}/lib" }.reject{|d| d == "#$brewfix/lib" }
+    syspath.map{|d| "#{d}/lib" }.reject{|d| d == "#{brewfix}/lib" }
   end
   def syscpath
     isystem, _ = cpath
@@ -197,7 +201,7 @@ class Cmd
   end
   def cpath
     cpath = ENV['CMAKE_PREFIX_PATH'].split(':').map{|d| "#{d}/include" } + ENV['CMAKE_INCLUDE_PATH'].split(':')
-    opt = cpath.grep(%r{^#$brewfix/opt})
+    opt = cpath.grep(%r{^#{brewfix}/opt})
     sys = cpath - opt
     [sys, opt]
   end
@@ -243,7 +247,7 @@ class Cmd
     ENV.key? 'as_nl'
   end
   def nclt?
-    $sdkroot != nil
+    sdkroot != nil
   end
   def cccfg? flags
     flags.split('').all?{|c| ENV['HOMEBREW_CCCFG'].include? c } if ENV['HOMEBREW_CCCFG']

Library/ENV/libsuperenv.rb

@@ -20,6 +20,3 @@ class Array
     select { |path| File.directory? path }.uniq.map { |path| prefix + path }
   end
 end
-
-$brewfix = ENV['HOMEBREW_PREFIX']
-$sdkroot = ENV['HOMEBREW_SDKROOT']