From 8df4b1f3e28cc7f84d8be790e47a66414c1e72ec Mon Sep 17 00:00:00 2001
From: =?utf8?q?=C3=89tienne=20Mollier?= <emollier@debian.org>
Date: Thu, 12 Feb 2026 19:43:30 +0100
Subject: [PATCH] d/rules: guard against accidental ABI breakages.

---
 debian/rules | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/debian/rules b/debian/rules
index 61b07630..92178284 100755
--- a/debian/rules
+++ b/debian/rules
@@ -59,6 +59,20 @@ ifneq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
   CMAKE_EXTRA_FLAGS += -DBUILD_TESTING:BOOL=OFF
 endif
 
+# Guard against accidental ABI breakages.
+DCMTK_SOVERSION != sed -n 's/set(DCMTK_ABI_VERSION \([0-9]\+\))/\1/p' CMake/dcmtkPrepare.cmake
+DEB_SOVERSION != sed -n 's/Package: libdcmtk\([0-9]\+\)/\1/p' debian/control
+execute_before_dh_autoreconf:
+	@ if [ $(DCMTK_SOVERSION) != $(DEB_SOVERSION) ] \
+	; then \
+		printf 'E: libdcmtk%s package mismatches dcmtk soversion %s.\n' \
+			$(DEB_SOVERSION) $(DCMTK_SOVERSION) \
+	;	printf 'E: Please bump the package soversion to libdcmtk%s\n' \
+			$(DCMTK_SOVERSION) \
+	;	printf 'E: and coordinate a transition.\n' \
+	;	exit 1 \
+	; fi
+
 override_dh_auto_configure:
 	dh_auto_configure -- $(CMAKE_EXTRA_FLAGS)
 
-- 
2.30.2