From 01a342550285a92d8eef84e27721389c40029f76 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Wed, 1 May 2019 09:06:41 +0100
Subject: [PATCH] Require Xcode 10.2 on macOS 10.14

Xcode >=10.2 is required to build all Swift formulae on macOS >=10.14.4.

Rather than requiring per-formula workarounds
(e.g. Homebrew/homebrew-core#39446) this provides a more stable platform
Homebrew can rely on for building Swift formulae.
---
 Library/Homebrew/os/mac/xcode.rb               |  2 +-
 .../Homebrew/requirements/xcode_requirement.rb | 18 ------------------
 2 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 7702576c7a..32efc86394 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -27,7 +27,7 @@ module OS
 
       def minimum_version
         case MacOS.version
-        when "10.14" then "10.0"
+        when "10.14" then "10.2"
         when "10.13" then "9.0"
         when "10.12" then "8.0"
         else "2.0"
diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index caeb67724b..3bdc95a908 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -14,7 +14,6 @@ class XcodeRequirement < Requirement
 
   def xcode_installed_version
     return false unless MacOS::Xcode.installed?
-    return false unless xcode_swift_compatability?
     return true unless @version
 
     MacOS::Xcode.version >= @version
@@ -26,12 +25,6 @@ class XcodeRequirement < Requirement
       A full installation of Xcode.app#{version} is required to compile
       this software. Installing just the Command Line Tools is not sufficient.
     EOS
-    unless xcode_swift_compatability?
-      message += <<~EOS
-
-        Xcode >=10.2 requires macOS >=10.14.4 to build many formulae.
-      EOS
-    end
     if @version && Version.new(MacOS::Xcode.latest_version) < Version.new(@version)
       message + <<~EOS
 
@@ -49,15 +42,4 @@ class XcodeRequirement < Requirement
   def inspect
     "#<#{self.class.name}: #{tags.inspect} version=#{@version.inspect}>"
   end
-
-  private
-
-  # TODO: when 10.14.4 and 10.2 have been around for long enough remove this
-  # method in favour of requiring 10.14.4 and 10.2.
-  def xcode_swift_compatability?
-    return true if MacOS::Xcode.version < "10.2"
-    return true if MacOS.full_version >= "10.14.4"
-
-    MacOS.full_version < "10.14"
-  end
 end