From c3ca76b1fadee072cc846c6eb0cc3ac971b5b200 Mon Sep 17 00:00:00 2001
From: Andreas Sturmlechner <asturm@gentoo.org>
Date: Tue, 17 Dec 2024 23:46:31 +0100
Subject: ecm.eclass: Introduce _ecm_handbook_optional() to support BUILD_DOC

Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>
---
 eclass/ecm.eclass | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'eclass/ecm.eclass')

diff --git a/eclass/ecm.eclass b/eclass/ecm.eclass
index 2ca2b3a9e5e..a02fe23732a 100644
--- a/eclass/ecm.eclass
+++ b/eclass/ecm.eclass
@@ -334,6 +334,18 @@ DEPEND+=" ${COMMONDEPEND}"
 RDEPEND+=" ${COMMONDEPEND}"
 unset COMMONDEPEND
 
+# @FUNCTION: _ecm_handbook_optional
+# @DESCRIPTION:
+# Use with ECM_HANDBOOK=optional; ticks either -DBUILD_DOC if available,
+# or -DCMAKE_DISABLE_FIND_PACKAGE_KF${_KFSLOT}DocTools
+_ecm_handbook_optional() {
+	if grep -Eq "option.*BUILD_DOC" CMakeLists.txt; then
+		echo "-DBUILD_DOC=$(usex handbook)"
+	else
+		echo "-DCMAKE_DISABLE_FIND_PACKAGE_KF${_KFSLOT}DocTools=$(usex !handbook)"
+	fi
+}
+
 # @FUNCTION: _ecm_strip_handbook_translations
 # @INTERNAL
 # @DESCRIPTION:
@@ -621,7 +633,7 @@ ecm_src_configure() {
 	fi
 
 	if [[ ${ECM_HANDBOOK} = optional ]] ; then
-		cmakeargs+=( -DCMAKE_DISABLE_FIND_PACKAGE_KF${_KFSLOT}DocTools=$(usex !handbook) )
+		cmakeargs+=( $(_ecm_handbook_optional) )
 	fi
 
 	if in_iuse designer && [[ ${ECM_DESIGNERPLUGIN} = true ]]; then
-- 
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