out-of-source-utils.eclass: add global-scope ewarn for deprecated < E…

…API 7

Signed-off-by: Sam James <[email protected]>

eclass/out-of-source-utils.eclass

@@ -1,4 +1,4 @@
-# Copyright 2022-2023 Gentoo Authors
+# Copyright 2022-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: out-of-source-utils.eclass
@@ -12,14 +12,18 @@
 # This eclass provides a run_in_build_dir() helper that can be used
 # to execute specified command inside BUILD_DIR.
 
+if [[ ! ${_OUT_OF_SOURCE_UTILS_ECLASS} ]]; then
+_OUT_OF_SOURCE_UTILS_ECLASS=1
+
 case ${EAPI} in
-	6|7|8) ;;
+	6)
+		ewarn "${CATEGORY}/${PF}: ebuild uses ${ECLASS} with deprecated EAPI ${EAPI}!"
+		ewarn "${CATEGORY}/${PF}: Support will be removed on 2024-10-08. Please port to newer EAPI."
+		;;
+	7|8) ;;
 	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
 esac
 
-if [[ ! ${_OUT_OF_SOURCE_UTILS_ECLASS} ]]; then
-_OUT_OF_SOURCE_UTILS_ECLASS=1
-
 # @FUNCTION: run_in_build_dir
 # @USAGE: <argv>...
 # @DESCRIPTION: