CFLAGS_FILE?=.cflags

COMPILE_TEST_FILE?=.test.c

PREFIX?=/usr/local

all: dsvpn

dsvpn: $(CFLAGS_FILE) Makefile src/vpn.c src/charm.c src/os.c include/charm.h include/vpn.h include/os.h

$(CC) $$(cat "$(CFLAGS_FILE)") $(OPTFLAGS) -Iinclude -o $@ src/vpn.c src/charm.c src/os.c

strip $@

install: dsvpn

install -d $(PREFIX)/sbin

install -m 0755 dsvpn $(PREFIX)/sbin

uninstall:

rm -f $(PREFIX)/sbin/dsvpn

clean:

rm -f dsvpn *~ $(CFLAGS_FILE) $(COMPILE_TEST_FILE)

$(CFLAGS_FILE):

@CFLAGS="$(CFLAGS)"

@if [ -z "$$CFLAGS" ]; then \

if [ ! -r "$(CFLAGS_FILE)" ]; then \

echo "int main(void) { return 0; }" > "$(COMPILE_TEST_FILE)"; \

for flag in -march=native -mtune=native -Ofast -Wno-unused-command-line-argument; do \

$(CC) $${CFLAGS} $${flag} "$(COMPILE_TEST_FILE)" >/dev/null 2>&1 && CFLAGS="$$CFLAGS $$flag"; \

done; \

rm -f a.out \

CFLAGS="$${CFLAGS} -Wall -W -Wshadow -Wmissing-prototypes"; \

fi \

fi; \

echo "$$CFLAGS" > "$(CFLAGS_FILE)"