macos-setup: Require Qt 5.9 or later and macOS 10.10 or later

The minimum required version of Qt is now 5.9, and thus the
minimum required version of macOS is 10.10 (Yosemite). Update
that in macos-setup, and remove various version checks and older
packages needed for Mountain Lion and Mavericks.

Also update the default version of Qt installed to 5.12.12, the
last release in the Qt 5.12 LTS series (and the last version with
an offline installer.)

tools/macos-setup.sh

@@ -19,10 +19,10 @@ shopt -s extglob
 DARWIN_MAJOR_VERSION=`uname -r | sed 's/\([0-9]*\).*/\1/'`
 
 #
-# The minimum supported version of Qt is 5.6, so the minimum supported version
-# of macOS is OS X 10.8 (Mountain Lion), aka Darwin 12.0
-if [[ $DARWIN_MAJOR_VERSION -lt 12 ]]; then
-    echo "This script does not support any versions of macOS before Mountain Lion" 1>&2
+# The minimum supported version of Qt is 5.9, so the minimum supported version
+# of macOS is OS X 10.10 (Yosemite), aka Darwin 14.0
+if [[ $DARWIN_MAJOR_VERSION -lt 14 ]]; then
+    echo "This script does not support any versions of macOS before Yosemite" 1>&2
     exit 1
 fi
 
@@ -58,8 +58,8 @@ fi
 
 #
 # Some packages need xz to unpack their current source.
-# While tar, since macOS 10.9, can uncompress xz'ed tarballs,
-# it can't do so in older versions, and xz isn't provided with macOS.
+# XXX: tar, since macOS 10.9, can uncompress xz'ed tarballs,
+# so perhaps we could get rid of this now?
 #
 XZ_VERSION=5.2.5
 
@@ -78,19 +78,7 @@ PCRE_VERSION=8.45
 # CMake is required to do the build - and to build some of the
 # dependencies.
 #
-# 3.19.2 is the first version to support Apple Silicon, but the precompiled
-# binary on cmake.org is only a universal binary that requires macOS 10.0
-# (Yosemite) or newer.
-#
-# So on Mountain Lion and Mavericks we choose the last stable release that
-# works on them (3.18.6), and on Yosemite and later we choose the latest stable
-# version (currently 3.19.7).
-#
-if [[ $DARWIN_MAJOR_VERSION -gt 13 ]]; then
-    CMAKE_VERSION=${CMAKE_VERSION-3.21.4}
-else
-    CMAKE_VERSION=${CMAKE_VERSION-3.18.6}
-fi
+CMAKE_VERSION=${CMAKE_VERSION-3.21.4}
 
 #
 # Ninja isn't required, as make is provided with Xcode, but it is
@@ -135,7 +123,7 @@ PCRE2_VERSION=10.39
 # "QT_VERSION=5.10.1 ./macos-setup.sh"
 # will build and install with QT 5.10.1.
 #
-QT_VERSION=${QT_VERSION-5.12.10}
+QT_VERSION=${QT_VERSION-5.12.12}
 
 if [ "$QT_VERSION" ]; then
     QT_MAJOR_VERSION="`expr $QT_VERSION : '\([0-9][0-9]*\).*'`"
@@ -215,19 +203,7 @@ else
     #
     # No - install a Python package.
     #
-    # 3.7.6 is the final version of Python to have official packages for the
-    # 64-bit/32-bit variant that supports 10.6 (Snow Leopard) through 10.8
-    # (Mountain Lion), and 3.9.1 is the first version of Python to support
-    # macOS 11 Big Sur and Apple Silicon (Arm-based Macs).
-    #
-    # So on Mountain Lion, choose 3.7.6, otherwise get the latest stable
-    # version (3.9.5).
-    #
-    if [[ $DARWIN_MAJOR_VERSION -gt 12 ]]; then
-        PYTHON3_VERSION=3.9.5
-    else
-        PYTHON3_VERSION=3.7.6
-    fi
+    PYTHON3_VERSION=3.9.5
 fi
 BROTLI_VERSION=1.0.9
 # minizip
@@ -1113,14 +1089,10 @@ install_qt() {
         5)
             case $QT_MINOR_VERSION in
 
-            0|1|2|3|4|5)
+            0|1|2|3|4|5|6|7|8)
                 echo "Qt $QT_VERSION" is too old 1>&2
                 ;;
 
-            6|7|8)
-                QT_VOLUME=qt-opensource-mac-x64-clang-$QT_VERSION
-                ;;
-
             9|10|11|12|13|14)
                 QT_VOLUME=qt-opensource-mac-x64-$QT_VERSION
                 ;;
@@ -1176,11 +1148,11 @@ uninstall_qt() {
             5*)
                 case $installed_qt_minor_version in
 
-                0|1|2)
+                0|1|2|3|4|5)
                     echo "Qt $installed_qt_version" is too old 1>&2
                     ;;
 
-                3|4|5|6|7|8)
+                6|7|8)
                     installed_qt_volume=qt-opensource-mac-x64-clang-$installed_qt_version.dmg
                     ;;
 
@@ -2281,10 +2253,6 @@ install_python3() {
         else
             macver=11
         fi
-    elif [[ $DARWIN_MAJOR_VERSION -lt 13 ]]; then
-        # The 64-bit installer requires 10.9 (Mavericks), use the 64-bit/32-bit
-        # variant for 10.8 (Mountain Lion).
-        macver=x10.6
     fi
     if [ "$PYTHON3_VERSION" -a ! -f python3-$PYTHON3_VERSION-done ] ; then
         echo "Downloading and installing python3:"