Update Mac CI pipelines to use MacOS-12 (#541)

* Update Mac CI pipelines to use MacOS-12

The MacOS-10.15 CI runners are now deprecated, and will begin brownouts in August. See discussion here: https://github.com/actions/virtual-environments/issues/5583

MacOS-11 is also available, in case there are any issues with 12.

* drop non-functional qt

* add warnings about Qt < 6.2 to docs

* specify Qt 6.2.4 as the minimum for ios

README.rst

@@ -155,6 +155,14 @@ to make it working well with installed directory.
 .. note::
    It is your own task to set some environment variables to fit your platform, such as PATH, QT_PLUGIN_PATH, QML_IMPORT_PATH, and QML2_IMPORT_PATH. aqtinstall will never do it for you, in order not to break the installation of multiple versions.
 
+.. warning::
+   If you are using aqtinstall to install the ios version of Qt, please be aware that
+   there are compatibility issues between XCode 13+ and versions of Qt less than 6.2.4.
+   You may use aqtinstall to install older versions of Qt for ios, but the developers of
+   aqtinstall cannot guarantee that older versions will work on the most recent versions of MacOS.
+   Aqtinstall is tested for ios on MacOS 12 with Qt 6.2.4 and greater.
+   All earlier versions of Qt are expected not to function.
+
 Testimonies
 -----------
 

azure-pipelines.yml

@@ -32,7 +32,7 @@ jobs:
 - job: Mac
   dependsOn: MatricesGenerator
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-12'
   strategy:
     matrix: $[ dependencies.MatricesGenerator.outputs['mtrx.mac'] ]
   steps:

ci/generate_azure_pipelines_matrices.py

@@ -270,8 +270,8 @@ mac_build_jobs.append(
 # mobile SDK
 mac_build_jobs.extend(
     [
-        BuildJob("install-qt", "5.15.2", "mac", "ios", "ios", "ios", is_autodesktop=True),
+        BuildJob("install-qt", "6.4.0", "mac", "ios", "ios", "ios", module="qtsensors", is_autodesktop=True),
-        BuildJob("install-qt", "6.2.2", "mac", "ios", "ios", "ios", module="qtsensors", is_autodesktop=False),
+        BuildJob("install-qt", "6.2.4", "mac", "ios", "ios", "ios", module="qtsensors", is_autodesktop=False),
         BuildJob("install-qt", "6.1.0", "mac", "android", "android_armv7", "android_armv7", is_autodesktop=True),
     ]
 )

docs/cli.rst

@@ -524,6 +524,8 @@ There are various combinations to accept according to Qt version.
 .. describe:: target
 
     desktop, ios, winrt, or android. The type of device for which you are developing Qt programs.
+    If your target is ios, please be aware that versions of Qt older than 6.2.4 are expected to be
+    non-functional with current versions of XCode (applies to any XCode greater than or equal to 13).
 
 .. describe:: Qt version