add tidy target to the Makefile for clang-tidy

Makefile

@@ -5,10 +5,12 @@ SHARED_FLAGS := -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra
 CFLAGS := -std=c11 $(SHARED_FLAGS) -Wmissing-prototypes
 CXXFLAGS := -std=c++14 $(SHARED_FLAGS)
 LDFLAGS := -Wl,-z,defs,-z,relro,-z,now,-z,nodlopen,-z,text
-OBJECTS := chacha.o malloc.o memory.o pages.o random.o util.o
+SOURCES := chacha.c malloc.c memory.c pages.c random.c util.c
+OBJECTS := $(SOURCES:.c=.o)
 
 ifeq ($(CONFIG_CXX_ALLOCATOR),true)
     LDLIBS += -lstdc++
+    SOURCES += new.cc
     OBJECTS += new.o
 endif
 
@@ -23,5 +25,10 @@ pages.o: pages.c pages.h memory.h util.h
 random.o: random.c random.h chacha.h util.h
 util.o: util.c util.h
 
+tidy:
+	clang-tidy $(SOURCES) -- $(CPPFLAGS)
+
 clean:
 	rm -f hardened_malloc.so $(OBJECTS)
+
+.PHONY: clean tidy