Update Makefile

Makefile

@@ -1,6 +1,37 @@
-CFLAGS=-std=c99 -g -fsanitize=address -fno-omit-frame-pointer -Wall
+CC      := gcc
+LDFLAGS := -Wl,-O1,--sort-common,--as-needed
+CFLAGS  := -std=c99 -ffreestanding -Wall -Wextra
 
-glorytun:
+prefix  := /usr/local
 
-setcap: glorytun
-	sudo setcap cap_net_admin+ep glorytun
+ifdef temps
+CFLAGS += -save-temps
+endif
+
+ifdef debug
+CFLAGS += -O0 -fno-omit-frame-pointer -g
+else
+CFLAGS += -O3 -fomit-frame-pointer -DNDEBUG
+endif
+
+ifdef sanitize
+CFLAGS += -fsanitize=$(sanitize)
+endif
+
+.PHONY: default install clean setcap
+
+default: glorytun
+
+install:
+	install -m 755 -d $(DESTDIR)$(prefix)/bin
+	install -m 755 -s glorytun $(DESTDIR)$(prefix)/bin
+
+clean:
+	@rm -f *.[ios] glorytun
+
+setcap:
+	setcap cap_net_admin+ep glorytun
+
+glorytun: glorytun.o
+glorytun.c: common-static.h
+common-static.h: common.h