dev-qt/qtcore: Add wall of blockers against <${QT5_PV}

Revdeps can drop dev-qt/* dependencies on version bumps at any time, which then
may lead to Portage disregarding these dev-qt/* packages for upgrade if nothing
is left depending on them. When these packages contain Qt5 plugins it breaks
runtime hard - broken screenlocker, blank login manager, ... -, with:

`Cannot mix incompatible Qt library (5.15.10) with this library (5.15.11)`

We've had this happen with dev-qt/qtvirtualkeyboard and dev-qt/qtcharts already
and gradual porting to Qt6 ensures it will happen more often in the future.

Package groups (https://bugs.gentoo.org/918873) are not effective here as it
concerns ::installed package set.

For lack of a better mechanism from the package manager, these blockers make
sure dep calculation will take care of the necessary cleanup of dangling Qt5
packages, even if it will not improve our backtracking situation.

Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>

1 files changed, 44 insertions, 1 deletions

diff --git a/dev-qt/qtcore/qtcore-5.15.12.9999.ebuild b/dev-qt/qtcore/qtcore-5.15.12.9999.ebuild
index 36a727a0..d5a3c424 100644
--- a/dev-qt/qtcore/qtcore-5.15.12.9999.ebuild
+++ b/dev-qt/qtcore/qtcore-5.15.12.9999.ebuild
@@ -24,7 +24,50 @@ DEPEND="
 	icu? ( dev-libs/icu:= )
 	!icu? ( virtual/libiconv )
 "
-RDEPEND="${DEPEND}"
+RDEPEND="${DEPEND}
+	!<dev-qt/designer-${QT5_PV}:5
+	!<dev-qt/qt3d-${QT5_PV}:5
+	!<dev-qt/qtbluetooth-${QT5_PV}:5
+	!<dev-qt/qtcharts-${QT5_PV}:5
+	!<dev-qt/qtconcurrent-${QT5_PV}:5
+	!<dev-qt/qtdatavis3d-${QT5_PV}:5
+	!<dev-qt/qtdbus-${QT5_PV}:5
+	!<dev-qt/qtdeclarative-${QT5_PV}:5
+	!<dev-qt/qtgamepad-${QT5_PV}:5
+	!<dev-qt/qtgraphicaleffects-${QT5_PV}:5
+	!<dev-qt/qtgui-${QT5_PV}:5
+	!<dev-qt/qthelp-${QT5_PV}:5
+	!<dev-qt/qtimageformats-${QT5_PV}:5
+	!<dev-qt/qtlocation-${QT5_PV}:5
+	!<dev-qt/qtmultimedia-${QT5_PV}:5
+	!<dev-qt/qtnetwork-${QT5_PV}:5
+	!<dev-qt/qtnetworkauth-${QT5_PV}:5
+	!<dev-qt/qtopengl-${QT5_PV}:5
+	!<dev-qt/qtpositioning-${QT5_PV}:5
+	!<dev-qt/qtprintsupport-${QT5_PV}:5
+	!<dev-qt/qtquickcontrols-${QT5_PV}:5
+	!<dev-qt/qtquickcontrols2-${QT5_PV}:5
+	!<dev-qt/qtquicktimeline-${QT5_PV}:5
+	!<dev-qt/qtscript-${QT5_PV}:5
+	!<dev-qt/qtscxml-${QT5_PV}:5
+	!<dev-qt/qtsensors-${QT5_PV}:5
+	!<dev-qt/qtserialbus-${QT5_PV}:5
+	!<dev-qt/qtserialport-${QT5_PV}:5
+	!<dev-qt/qtspeech-${QT5_PV}:5
+	!<dev-qt/qtsql-${QT5_PV}:5
+	!<dev-qt/qtsvg-${QT5_PV}:5
+	!<dev-qt/qttest-${QT5_PV}:5
+	!<dev-qt/qtvirtualkeyboard-${QT5_PV}:5
+	!<dev-qt/qtwayland-${QT5_PV}:5
+	!<dev-qt/qtwebchannel-${QT5_PV}:5
+	!<dev-qt/qtwebengine-${QT5_PV}:5
+	!<dev-qt/qtwebsockets-${QT5_PV}:5
+	!<dev-qt/qtwebview-${QT5_PV}:5
+	!<dev-qt/qtwidgets-${QT5_PV}:5
+	!<dev-qt/qtx11extras-${QT5_PV}:5
+	!<dev-qt/qtxml-${QT5_PV}:5
+	!<dev-qt/qtxmlpatterns-${QT5_PV}:5
+"
 
 QT5_TARGET_SUBDIRS=(
 	src/tools/bootstrap