dev-qt/qt-creator: migrate live to llvm-r1, allow slot 18

Tested with 18.1.0_rc2 at same time, seems to be fine so may
as well do this now.

Will migrate 12.0.2 when add Qt6.6.2 given that will trigger
a rebuild either way.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

dev-qt/qt-creator/qt-creator-9999.ebuild

@@ -3,8 +3,10 @@
 
 EAPI=8
 
+LLVM_COMPAT=( {15..18} )
+LLVM_OPTIONAL=1
 PYTHON_COMPAT=( python3_{10..12} )
-inherit cmake flag-o-matic llvm python-any-r1 readme.gentoo-r1 xdg
+inherit cmake flag-o-matic llvm-r1 python-any-r1 readme.gentoo-r1 xdg
 
 if [[ ${PV} == 9999 ]]; then
 	inherit git-r3
@@ -35,9 +37,9 @@ IUSE="
 	+clang +designer doc +help qmldesigner serialterminal
 	+svg test +tracing webengine
 "
+REQUIRED_USE="clang? ( ${LLVM_REQUIRED_USE} )"
 RESTRICT="!test? ( test )"
 
-LLVM_MAX_SLOT=17
 QT_PV=6.2.0:6 # IDE_QT_VERSION_MIN
 
 # := is used where Qt's private APIs are used for safety
@@ -47,7 +49,7 @@ COMMON_DEPEND="
 	>=dev-qt/qtdeclarative-${QT_PV}=
 	clang? (
 		dev-cpp/yaml-cpp:=
-		<sys-devel/clang-$((LLVM_MAX_SLOT+1)):=
+		$(llvm_gen_dep 'sys-devel/clang:${LLVM_SLOT}')
 	)
 	designer? ( >=dev-qt/qttools-${QT_PV}[designer] )
 	help? (
@@ -84,13 +86,9 @@ PATCHES=(
 	"${FILESDIR}"/${PN}-12.0.0-musl-no-malloc-trim.patch
 )
 
-llvm_check_deps() {
-	has_version -d "sys-devel/clang:${LLVM_SLOT}"
-}
-
 pkg_setup() {
 	python-any-r1_pkg_setup
-	use clang && llvm_pkg_setup
+	use clang && llvm-r1_pkg_setup
 }
 
 src_prepare() {