xcode: add checks for Xcode/CLT minimum versions.

1 files changed, 22 insertions, 0 deletions

diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 9f49162d5..f081d4382 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -25,6 +25,17 @@ module OS
         end
       end
 
+      def minimum_version
+        case MacOS.version
+        when "10.12" then "8.0"
+        else "2.0"
+        end
+      end
+
+      def minimum_version?
+        version < minimum_version
+      end
+
       def prerelease?
         # TODO: bump to version >= "8.3" after Xcode 8.2 is stable.
         version >= "8.2"
@@ -205,6 +216,17 @@ module OS
         end
       end
 
+      def minimum_version
+        case MacOS.version
+        when "10.12" then "8.0.0"
+        else "4.0.0"
+        end
+      end
+
+      def minimum_version?
+        version < minimum_version
+      end
+
       def outdated?
         if MacOS.version >= :mavericks
           version = Utils.popen_read("#{MAVERICKS_PKG_PATH}/usr/bin/clang --version")