qt5: make not keg_only, delete qt, add qt alias.

Closes #8306.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Aliases/qt

@@ -0,0 +1 @@
+../Formula/qt5.rb

Aliases/qt4

@@ -1 +0,0 @@
-../Formula/qt.rb

Formula/qt.rb

@@ -1,151 +0,0 @@
-class Qt < Formula
-  desc "Cross-platform application and UI framework"
-  homepage "https://www.qt.io/"
-  url "https://download.qt.io/official_releases/qt/4.8/4.8.7/qt-everywhere-opensource-src-4.8.7.tar.gz"
-  mirror "https://www.mirrorservice.org/sites/download.qt-project.org/official_releases/qt/4.8/4.8.7/qt-everywhere-opensource-src-4.8.7.tar.gz"
-  sha256 "e2882295097e47fe089f8ac741a95fef47e0a73a3f3cdf21b56990638f626ea0"
-  revision 2
-
-  head "https://code.qt.io/qt/qt.git", :branch => "4.8"
-
-  bottle do
-    sha256 "f6dc9df6f78e1d8c12ebf961c8a9196885a1ee732eed098b2cbe8320f2d9a7a8" => :el_capitan
-    sha256 "323bcba88bd3600a4a5dc26d43602e57a71609f1d9a620b9d42b63426569e191" => :yosemite
-    sha256 "157a2338190f124a7c9446ecafa6669f503ca4e0221fece620096832a767f852" => :mavericks
-  end
-
-  # Backport of Qt5 commit to fix the fatal build error with Xcode 7, SDK 10.11.
-  # https://code.qt.io/cgit/qt/qtbase.git/commit/?id=b06304e164ba47351fa292662c1e6383c081b5ca
-  patch do
-    url "https://raw.githubusercontent.com/Homebrew/formula-patches/480b7142c4e2ae07de6028f672695eb927a34875/qt/el-capitan.patch"
-    sha256 "c8a0fa819c8012a7cb70e902abb7133fc05235881ce230235d93719c47650c4e"
-  end
-
-  option "with-qt3support", "Build with deprecated Qt3Support module support"
-  option "with-docs", "Build documentation"
-  option "without-webkit", "Build without QtWebKit module"
-
-  depends_on "openssl"
-  depends_on "dbus" => :optional
-  depends_on "mysql" => :optional
-  depends_on "postgresql" => :optional
-
-  # Qt4 is dead upstream. We backported a build fix for 10.11 but do not
-  # intend to keep rescuing it forever, including for macOS 10.12. Homebrew will
-  # be migrating to Qt5 as widely as possible, which remains supported upstream.
-  depends_on MaximumMacOSRequirement => :el_capitan
-
-  deprecated_option "qtdbus" => "with-dbus"
-  deprecated_option "with-d-bus" => "with-dbus"
-
-  resource "test-project" do
-    url "https://gist.github.com/tdsmith/f55e7e69ae174b5b5a03.git",
-        :revision => "6f565390395a0259fa85fdd3a4f1968ebcd1cc7d"
-  end
-
-  def install
-    args = %W[
-      -prefix #{prefix}
-      -release
-      -opensource
-      -confirm-license
-      -fast
-      -system-zlib
-      -qt-libtiff
-      -qt-libpng
-      -qt-libjpeg
-      -nomake demos
-      -nomake examples
-      -cocoa
-    ]
-
-    if ENV.compiler == :clang
-      args << "-platform"
-
-      if MacOS.version >= :mavericks
-        args << "unsupported/macx-clang-libc++"
-      else
-        args << "unsupported/macx-clang"
-      end
-    end
-
-    args << "-openssl-linked"
-    args << "-I" << Formula["openssl"].opt_include
-    args << "-L" << Formula["openssl"].opt_lib
-
-    args << "-plugin-sql-mysql" if build.with? "mysql"
-    args << "-plugin-sql-psql" if build.with? "postgresql"
-
-    if build.with? "dbus"
-      dbus_opt = Formula["dbus"].opt_prefix
-      args << "-I#{dbus_opt}/lib/dbus-1.0/include"
-      args << "-I#{dbus_opt}/include/dbus-1.0"
-      args << "-L#{dbus_opt}/lib"
-      args << "-ldbus-1"
-      args << "-dbus-linked"
-    end
-
-    if build.with? "qt3support"
-      args << "-qt3support"
-    else
-      args << "-no-qt3support"
-    end
-
-    args << "-nomake" << "docs" if build.without? "docs"
-
-    if MacOS.prefer_64_bit?
-      args << "-arch" << "x86_64"
-    else
-      args << "-arch" << "x86"
-    end
-
-    args << "-no-webkit" if build.without? "webkit"
-
-    system "./configure", *args
-    system "make"
-    ENV.deparallelize
-    system "make", "install"
-
-    # what are these anyway?
-    (bin+"pixeltool.app").rmtree
-    (bin+"qhelpconverter.app").rmtree
-    # remove porting file for non-humans
-    (prefix+"q3porting.xml").unlink if build.without? "qt3support"
-
-    # Some config scripts will only find Qt in a "Frameworks" folder
-    frameworks.install_symlink Dir["#{lib}/*.framework"]
-
-    # The pkg-config files installed suggest that headers can be found in the
-    # `include` directory. Make this so by creating symlinks from `include` to
-    # the Frameworks' Headers folders.
-    Pathname.glob("#{lib}/*.framework/Headers") do |path|
-      include.install_symlink path => path.parent.basename(".framework")
-    end
-
-    # Make `HOMEBREW_PREFIX/lib/qt4/plugins` an additional plug-in search path
-    # for Qt Designer to support formulae that provide Qt Designer plug-ins.
-    system "/usr/libexec/PlistBuddy",
-            "-c", "Add :LSEnvironment:QT_PLUGIN_PATH string \"#{HOMEBREW_PREFIX}/lib/qt4/plugins\"",
-           "#{bin}/Designer.app/Contents/Info.plist"
-
-    Pathname.glob("#{bin}/*.app") { |app| mv app, prefix }
-  end
-
-  def caveats; <<-EOS.undent
-    We agreed to the Qt opensource license for you.
-    If this is unacceptable you should uninstall.
-
-    Qt Designer no longer picks up changes to the QT_PLUGIN_PATH environment
-    variable as it was tweaked to search for plug-ins provided by formulae in
-      #{HOMEBREW_PREFIX}/lib/qt4/plugins
-    EOS
-  end
-
-  test do
-    Encoding.default_external = "UTF-8" unless RUBY_VERSION.start_with? "1."
-    resource("test-project").stage testpath
-    system bin/"qmake"
-    system "make"
-    assert_match(/GitHub/, pipe_output(testpath/"qtnetwork-test 2>&1", nil, 0))
-  end
-end

Formula/qt5.rb

@@ -15,8 +15,6 @@ class Qt5 < Formula
     sha256 "1bbdf366e87a2fb8adb4f657a384b9dd8851149c06c23be870838abd24433991" => :yosemite
   end
 
-  keg_only "Qt 5 conflicts Qt 4"
-
   option "with-docs", "Build documentation"
   option "with-examples", "Build examples"
   option "with-qtwebkit", "Build with QtWebkit module"