qt5: fix webengine+ppc64le, disable webengine where needed

This allows qt5 to be built with webengine on ppc64 little
endian. Since webengine is broken on a lot of other archs,
this also adds code to disable webengine where otherwise
broken, so we can allow building qt5 on every architecture
instead of marking it broken.

[ci skip]

Closes: #7642 [via git-merge-pr]
Signed-off-by: Jürgen Buchmüller <pullmoll@t-online.de>

srcpkgs/qt5/patches/qtwebengine-enable-ppc64.patch

@@ -0,0 +1,41 @@
+This adds the necessary bits to make qt attempt building webengine on ppc64.
+Since the patch is only sufficient for ppc64le, keep it commented out and
+let the packaging template remove the comment later, as there is no good
+way to check endianness directly in the file.
+
+We also have to disable jumbo build for the time being because it results
+in build failures otherwise, most likely because of compiler miscompiling
+the code.
+--- qtwebengine/mkspecs/features/functions.prf
++++ qtwebengine/mkspecs/features/functions.prf
+@@ -95,6 +95,7 @@
+     contains(qtArch, "arm64"): return(arm64)
+     contains(qtArch, "mips"): return(mipsel)
+     contains(qtArch, "mips64"): return(mips64el)
++    contains(qtArch, "power64"): return(ppc64)
+     return(unknown)
+ }
+ 
+--- qtwebengine/mkspecs/features/platform.prf
++++ qtwebengine/mkspecs/features/platform.prf
+@@ -82,6 +82,7 @@
+     contains(QT_ARCH, "arm")|contains(QT_ARCH, "arm64"): return(true)
+     contains(QT_ARCH, "mips"): return(true)
+ #     contains(QT_ARCH, "mips64"): return(true)
++#ppc64le    contains(QT_ARCH, "power64"): return(true)
+ 
+     skipBuild("QtWebEngine can only be built for x86, x86-64, ARM, Aarch64, and MIPSel architectures.")
+     return(false)
+--- qtwebengine/src/core/config/linux.pri
++++ qtwebengine/src/core/config/linux.pri
+@@ -90,6 +90,10 @@
+     else: contains(QMAKE_CFLAGS, "-mdsp"): gn_args += mips_dsp_rev=1
+ }
+ 
++contains(QT_ARCH, "power64") {
++    gn_args += use_jumbo_build=false
++}
++
+ host_build {
+     gn_args += custom_toolchain=\"$$QTWEBENGINE_OUT_ROOT/src/toolchain:host\"
+     GN_HOST_CPU = $$gnArch($$QT_ARCH)

srcpkgs/qt5/template

@@ -16,20 +16,47 @@ makedepends="SDL2-devel Vulkan-Headers alsa-lib-devel double-conversion-devel
  unixodbc-devel xcb-util-image-devel xcb-util-keysyms-devel
  xcb-util-renderutil-devel xcb-util-wm-devel"
 depends="qtchooser"
-replaces="qt5-doc<5.6.0 qt5-quick1<5.6.0 qt5-quick1-devel<5.6.0 qt5-webkit<5.6.0 qt5-webkit-devel<5.6.0
- qt5-enginio<5.7.1 qt5-enginio-devel<5.7.1 qt5-plugin-gtk<5.7.1"
-homepage="https://qt.io/"
 short_desc="Cross-platform application and UI framework (QT5)"
 maintainer="Jürgen Buchmüller <pullmoll@t-online.de>"
 license="GPL-3.0-or-later, LGPL-2.1-or-later"
+homepage="https://qt.io/"
 distfiles="http://download.qt.io/official_releases/qt/${version%.*}/${version}/single/qt-everywhere-src-${version}.tar.xz"
 checksum=859417642713cee2493ee3646a7fee782c9f1db39e41d7bb1322bba0c5f0ff4d
+replaces="qt5-doc<5.6.0 qt5-quick1<5.6.0 qt5-quick1-devel<5.6.0 qt5-webkit<5.6.0 qt5-webkit-devel<5.6.0
+ qt5-enginio<5.7.1 qt5-enginio-devel<5.7.1 qt5-plugin-gtk<5.7.1"
+
+build_options="webengine"
+desc_option_webengine="Build Chromium-based WebEngine component"
 
 case "$XBPS_TARGET_MACHINE" in
-	armv5tel*) broken="qtwebengine use VSM assembler commands";;
-	mips*) broken="qtwebengine fails to build";;
+	x86_64*|i686*|ppc64le*) build_options_default="webengine";;
+	armv5tel*) ;; # qtwebengine uses VSM assembler commands
+	arm*|aarch64*) build_options_default="webengine";;
+	*) ;; # assume no webengine
 esac
 
+subpackages="qt5-3d qt5-3d-devel qt5-canvas3d qt5-charts qt5-charts-devel
+ qt5-connectivity qt5-connectivity-devel qt5-datavis3d qt5-datavis3d-devel
+ qt5-declarative qt5-declarative-devel qt5-devel qt5-examples qt5-gamepad
+ qt5-gamepad-devel qt5-graphicaleffects qt5-host-tools qt5-imageformats
+ qt5-location qt5-location-devel qt5-multimedia qt5-multimedia-devel
+ qt5-networkauth qt5-networkauth-devel qt5-plugin-mysql qt5-plugin-odbc
+ qt5-plugin-pgsql qt5-plugin-sqlite qt5-plugin-tds qt5-purchasing
+ qt5-purchasing-devel qt5-qmake qt5-quickcontrols qt5-quickcontrols2
+ qt5-quickcontrols2-devel qt5-remoteobjects qt5-remoteobjects-devel
+ qt5-script qt5-script-devel qt5-scxml qt5-scxml-devel qt5-sensors
+ qt5-sensors-devel qt5-serialbus qt5-serialbus-devel qt5-serialport
+ qt5-serialport-devel qt5-speech qt5-speech-devel qt5-svg qt5-svg-devel
+ qt5-tools qt5-tools-devel qt5-translations qt5-virtualkeyboard
+ qt5-virtualkeyboard-devel qt5-wayland qt5-wayland-devel qt5-webchannel
+ qt5-webchannel-devel qt5-webglplugin qt5-webglplugin-devel qt5-websockets
+ qt5-websockets-devel qt5-webview qt5-webview-devel qt5-x11extras
+ qt5-x11extras-devel qt5-xmlpatterns qt5-xmlpatterns-devel"
+
+if [ "$build_option_webengine" ]; then
+	subpackages+=" qt5-webengine qt5-webengine-devel"
+fi
+
 if [ "${XBPS_MACHINE%%-musl}" = i686 ]; then
 	nodebug=yes  # prevent OOM
 fi
@@ -44,7 +71,9 @@ if [ "$CROSS_BUILD" ]; then
 	# wayland-devel contains /usr/bin/wayland-scanner
 	hostmakedepends+=" icu-devel wayland-devel zlib-devel"
 	# Cross building qtwebengine requires some more host packages
-	hostmakedepends+=" nss-devel libevent-devel"
+	if [ "$build_option_webengine" ]; then
+		hostmakedepends+=" nss-devel libevent-devel"
+	fi
 fi
 
 _cleanup_wrksrc_leak() {
@@ -180,6 +209,9 @@ do_configure() {
 			qtwebengine/src/3rdparty/chromium/third_party/pdfium/third_party/base/allocator/partition_allocator/spin_lock.cc \
 			-e 's;"yield";"nop";'
 		;;
+	ppc64le*) # enable webengine but not on BE ppc64 for now
+		sed -i qtwebengine/mkspecs/features/platform.prf -e 's;#ppc64le;;'
+		;;
 	esac
 
 	case "$XBPS_TARGET_MACHINE" in
@@ -331,6 +363,11 @@ do_configure() {
 	opts+=" -silent"
 	# opts+=" -v"
 
+	# make sure to disable webengine on platforms that we don't build it for
+	if [ -z "$build_option_webengine" ]; then
+		opts+=" -skip qtwebengine"
+	fi
+
 	LDFLAGS+=" -Wl,--no-keep-memory"  # needs more than 8GB RAM else
 	if [ -n "$CROSS_BUILD" ]; then
 		spec=void-${XBPS_CROSS_TRIPLET}-g++