feat: add valgrind targets

Makefile

@@ -24,6 +24,8 @@ bins+=81-deadlock
 bins_target=$(addprefix ${build_dir}/,${bins})
 install_bins_targets=$(addprefix ${install_dir}/bin/,${bins})
 
+valgrind_targets=$(addprefix valgrind_,${bins})
+
 src_dirs=$(sort $(dir $(wildcard ${src_dir}/**/)))
 includes=$(patsubst %,-I%,${src_dirs})
 
@@ -61,8 +63,11 @@ graphs:
 	true
 
 .PHONY: valgrind
-valgrind: build
-	valgrind --leak-check=full --show-reachable=yes --track-origins=yes
+valgrind: ${valgrind_targets}
+
+.PHONY: ${valgrind_targets}
+${valgrind_targets}: valgrind_%: ${build_dir}/%
+	valgrind $^ --leak-check=full --show-reachable=yes --track-origins=yes
 
 .PHONY: build
 build: ${bins_target}