qt: add 5.10.0, fix macOS build, clean-up comments/TODOs (#6766)

* qt: add 5.10.0, fix macOS build, clean-up comments/TODOs

* qt: fix pkgconfig files

* qt: restore-pc-files.patch

* add version constraint to the patch

* qt: adjust url_for_version for 5.10.0

var/spack/repos/builtin/packages/qt/package.py

@@ -36,6 +36,7 @@ class Qt(Package):
     list_url = 'http://download.qt.io/archive/qt/'
     list_depth = 3
 
+    version('5.10.0', 'c5e275ab0ed7ee61d0f4b82cd471770d')
     version('5.9.1',  '77b4af61c49a09833d4df824c806acaf')
     version('5.9.0',  '9c8bc8b828c2b56721980368266df9d9')
     version('5.8.0',  'a9f2494f75f966e2f22358ec367d8f41')
@@ -66,6 +67,10 @@ class Qt(Package):
     variant('opengl',     default=False,
             description="Build with OpenGL support.")
 
+    # fix installation of pkgconfig files
+    # see https://github.com/Homebrew/homebrew-core/pull/5951
+    patch('restore-pc-files.patch', when='@5.9: platform=darwin')
+
     patch('qt3krell.patch', when='@3.3.8b+krellpatch')
 
     # see https://bugreports.qt.io/browse/QTBUG-57656
@@ -96,12 +101,24 @@ class Qt(Package):
     depends_on("libmng")
     depends_on("jpeg")
     depends_on("icu4c")
-    depends_on("fontconfig")
+    depends_on("fontconfig", when=(sys.platform != 'darwin'))  # (Unix only)
     depends_on("freetype")
-    # FIXME:
-    # depends_on("freetype", when='@5.8:') and '-system-freetype'
-    # -system-harfbuzz
-    # -system-pcre
+
+    # Core options:
+    # -doubleconversion  [system/qt/no]
+    # -iconv             [posix/sun/gnu/no] (Unix only)
+    # -pcre              [system/qt]
+
+    # Gui, printing, widget options:
+    # -harfbuzz          [system/qt/no]
+    # -xkbcommon-x11     [system/qt/no]
+    # -system-xkbcommon
+
+    # Database options:
+    # -sqlite            [system/qt]
+
+    # Qt3D options:
+    # -assimp            [system/qt/no]
 
     # QtQml
     depends_on("python", when='@5.7.0:', type='build')
@@ -121,6 +138,17 @@ class Qt(Package):
     # depends_on("pulse", when='+multimedia')
     # depends_on("flac", when='+multimedia')
     # depends_on("ogg", when='+multimedia')
+    # -pulseaudio                [auto] (Unix only)
+    # -alsa                      [auto] (Unix only)
+
+    # Webengine options:
+    # -webengine-alsa            [auto] (Linux only)
+    # -webengine-pulseaudio      [auto] (Linux only)
+    # -webengine-embedded-build  [auto] (Linux only)
+    # -webengine-icu             [system/qt] (Linux only)
+    # -webengine-ffmpeg          [system/qt] (Linux only)
+    # -webengine-opus            [system/qt] (Linux only)
+    # -webengine-webp            [system/qt] (Linux only)
 
     use_xcode = True
 
@@ -146,7 +174,9 @@ def url_for_version(self, version):
         elif version >= Version('2.1'):
             url += 'x11-'
 
-        if version >= Version('4.0'):
+        if version >= Version('5.10.0'):
+            url += 'src-'
+        elif version >= Version('4.0'):
             url += 'opensource-src-'
         elif version >= Version('3'):
             url += 'free-'
@@ -198,6 +228,7 @@ def patch(self):
 
     @property
     def common_config_args(self):
+        # incomplete list is here http://doc.qt.io/qt-5/configure-options.html
         config_args = [
             '-prefix', self.prefix,
             '-v',
@@ -208,12 +239,14 @@ def common_config_args(self):
             '-confirm-license',
             '-openssl-linked',
             '-optimized-qmake',
-            '-fontconfig',
             '-system-freetype',
             '-I{0}/freetype2'.format(self.spec['freetype'].prefix.include),
             '-no-pch'
         ]
 
+        if sys.platform != 'darwin':
+            config_args.append('-fontconfig')
+
         if '@:5.7.1' in self.spec:
             config_args.append('-no-openvg')
         else:
@@ -255,6 +288,8 @@ def common_config_args(self):
                 '-no-alsa',
             ])
 
+        # FIXME: else: -system-xcb ?
+
         if '@4' in self.spec and sys.platform == 'darwin':
             config_args.append('-cocoa')
 

var/spack/repos/builtin/packages/qt/restore-pc-files.patch

@@ -0,0 +1,15 @@
+Partially reverts <https://codereview.qt-project.org/#/c/140954/>.
+
+diff --git i/qtbase/mkspecs/features/qt_module.prf w/qtbase/mkspecs/features/qt_module.prf
+index bb28af97..36bb6483 100644
+--- i/qtbase/mkspecs/features/qt_module.prf
++++ w/qtbase/mkspecs/features/qt_module.prf
+@@ -245,7 +245,7 @@ load(qt_installs)
+ load(qt_targets)
+
+ # this builds on top of qt_common
+-!internal_module:!lib_bundle:if(unix|mingw) {
++!internal_module:if(unix|mingw) {
+     CONFIG += create_pc
+     QMAKE_PKGCONFIG_DESTDIR = pkgconfig
+     host_build: \