1 files changed, 29 insertions, 15 deletions
diff --git a/Library/Homebrew/extend/ENV/shared.rb b/Library/Homebrew/extend/ENV/shared.rb
index 9ef512b92..87347a89e 100644
--- a/Library/Homebrew/extend/ENV/shared.rb
+++ b/Library/Homebrew/extend/ENV/shared.rb
@@ -27,6 +27,10 @@ module SharedEnvExtension
     GOBIN
   ]
 
+  def setup_build_environment(formula=nil)
+    @formula = formula
+  end
+
   def reset
     SANITIZED_VARS.each { |k| delete(k) }
   end
@@ -101,15 +105,21 @@ module SharedEnvExtension
   def fcflags;  self['FCFLAGS'];      end
 
   def compiler
-    @compiler ||= if (cc = ARGV.cc || homebrew_cc)
-      COMPILER_SYMBOL_MAP.fetch(cc) do |other|
-        case other
-        when GNU_GCC_REGEXP
-          other
-        else
-          raise "Invalid value for --cc: #{other}"
-        end
+    @compiler ||= if (cc = ARGV.cc)
+      warn_about_non_apple_gcc($1) if cc =~ GNU_GCC_REGEXP
+      fetch_compiler(cc, "--cc")
+    elsif (cc = homebrew_cc)
+      warn_about_non_apple_gcc($1) if cc =~ GNU_GCC_REGEXP
+      compiler = fetch_compiler(cc, "HOMEBREW_CC")
+
+      if @formula
+        compilers = [compiler] + CompilerSelector.compilers
+        compiler = CompilerSelector.select_for(@formula, compilers)
       end
+
+      compiler
+    elsif @formula
+      CompilerSelector.select_for(@formula)
     else
       MacOS.default_compiler
     end
@@ -127,13 +137,6 @@ module SharedEnvExtension
     end
   end
 
-  # If the given compiler isn't compatible, will try to select
-  # an alternate compiler, altering the value of environment variables.
-  # If no valid compiler is found, raises an exception.
-  def validate_cc!(formula)
-    send CompilerSelector.select_for(formula)
-  end
-
   # Snow Leopard defines an NCURSES value the opposite of most distros
   # See: http://bugs.python.org/issue6848
   # Currently only used by aalib in core
@@ -260,4 +263,15 @@ module SharedEnvExtension
   def homebrew_cc
     self["HOMEBREW_CC"]
   end
+
+  def fetch_compiler(value, source)
+    COMPILER_SYMBOL_MAP.fetch(value) do |other|
+      case other
+      when GNU_GCC_REGEXP
+        other
+      else
+        raise "Invalid value for #{source}: #{other}"
+      end
+    end
+  end
 end