From 9070a9c1030c65bc181f1d00e7226167508059c4 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 8 Nov 2013 16:52:42 +0100
Subject: [PATCH] build-sys: add make check-api-unused

---
 Makefile.am | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 53685c11c..a67f18b77 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4578,3 +4578,23 @@ check-api-docs: $(lib_LTLIBRARIES) man
 			echo "‣ Symbol $$symbol() lacks documentation." ; \
 		fi ; \
 	 done
+
+OBJECT_VARIABLES:=$(filter %_OBJECTS,$(.VARIABLES))
+ALL_OBJECTS:=$(foreach v,$(OBJECT_VARIABLES),$($(v)))
+
+defined: $(ALL_OBJECTS)
+	$(AM_V_GEN)for f in $(ALL_OBJECTS) ; do \
+		nm -g --undefined-only `echo $(builddir)/"$$f" | sed -e 's,\([^/]*\).lo$$,.libs/\1.o,'` ; \
+	done | cut -c 20- | cut -d @ -f 1 | sort -u > $(builddir)/undefined
+
+undefined:
+	$(AM_V_GEN)for f in $(ALL_OBJECTS) ; do \
+		nm -g --defined-only `echo $(builddir)/"$$f" | sed -e 's,\([^/]*\).lo$$,.libs/\1.o,'` ; \
+	done | cut -c 20- | cut -d @ -f 1 | sort -u > $(builddir)/defined
+
+CLEANFILES += \
+	defined \
+	undefined
+
+check-api-unused: defined undefined
+	diff -u undefined defined | grep ^+ | grep -v ^+++ | cut -c2-
-- 
2.30.2