ENV: reset LD when switching compilers

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Homebrew/extend/ENV.rb

@@ -88,6 +88,7 @@ module HomebrewEnvExtension
   def gcc_4_0_1
     # we don't use xcrun because gcc 4.0 has not been provided since Xcode 4
     self['CC'] = "#{MacOS.dev_tools_path}/gcc-4.0"
+    self['LD'] = self['CC']
     self['CXX'] = "#{MacOS.dev_tools_path}/g++-4.0"
     self['OBJC'] = self['CC']
     replace_in_cflags '-O4', '-O3'
@@ -129,6 +130,7 @@ module HomebrewEnvExtension
     self['CC'] = `/usr/bin/xcrun -find #{$1}`.chomp if $1
     self['CXX'] =~ %r{/usr/bin/xcrun (.*)}
     self['CXX'] = `/usr/bin/xcrun -find #{$1}`.chomp if $1
+    self['LD'] = self['CC']
     self['OBJC'] = self['CC']
   end
 
@@ -138,11 +140,13 @@ module HomebrewEnvExtension
     # But we don't want LLVM of course.
 
     self['CC'] = xcrun "gcc-4.2"
+    self['LD'] = self['CC']
     self['CXX'] = xcrun "g++-4.2"
     self['OBJC'] = self['CC']
 
     unless self['CC']
       self['CC'] = "#{HOMEBREW_PREFIX}/bin/gcc-4.2"
+      self['LD'] = self['CC']
       self['CXX'] = "#{HOMEBREW_PREFIX}/bin/g++-4.2"
       self['OBJC'] = self['CC']
       raise "GCC could not be found" if not File.exist? self['CC']
@@ -160,6 +164,7 @@ module HomebrewEnvExtension
 
   def llvm
     self['CC'] = xcrun "llvm-gcc"
+    self['LD'] = self['CC']
     self['CXX'] = xcrun "llvm-g++"
     self['OBJC'] = self['CC']
     set_cpu_cflags 'core2 -msse4', :penryn => 'core2 -msse4.1', :core2 => 'core2', :core => 'prescott'
@@ -168,6 +173,7 @@ module HomebrewEnvExtension
 
   def clang
     self['CC'] = xcrun "clang"
+    self['LD'] = self['CC']
     self['CXX'] = xcrun "clang++"
     self['OBJC'] = self['CC']
     replace_in_cflags(/-Xarch_i386 (-march=\S*)/, '\1')

Library/Homebrew/test/test_ENV.rb

@@ -25,4 +25,11 @@ class EnvironmentTests < Test::Unit::TestCase
     assert !ENV.cc.empty?
     assert !ENV.cxx.empty?
   end
+
+  def test_switching_compilers
+    ENV.llvm
+    ENV.clang
+    assert_equal ENV['LD'], ENV['CC']
+    assert_equal ENV['OBJC'], ENV['CC']
+  end
 end