[Dnsmasq-discuss] [PATCH] Let the Makefile be aware of changes in COPTS varaible.

[Yousong Zhou]

Signed-off-by: Yousong Zhou <yszhou4tech at gmail.com>
---
 .gitignore |    2 +-
 Makefile   |   10 +++++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index fcdbcbd..23f1148 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,7 @@ src/*.mo
 src/dnsmasq.pot
 src/dnsmasq
 src/dnsmasq_baseline
-src/.configured
+src/.copts_*
 contrib/wrt/dhcp_lease_time
 contrib/wrt/dhcp_release
 debian/base/
diff --git a/Makefile b/Makefile
index c340f1c..c00eee6 100644
--- a/Makefile
+++ b/Makefile
@@ -74,6 +74,10 @@ objs = cache.o rfc1035.o util.o option.o forward.o network.o \
 hdrs = dnsmasq.h config.h dhcp-protocol.h dhcp6-protocol.h \
        dns-protocol.h radv-protocol.h ip6addr.h
 
+COPTS_CONF = .copts_$(shell $(CC) -DDNSMASQ_COMPILE_OPTS $(COPTS) -E $(top)/$(SRC)/config.h | \
+			( md5sum 2>/dev/null || md5 ) | cut -f 1 -d ' ')
+COPTS_CONF_WILD = .copts_*
+
 all : $(BUILDDIR)
 	@cd $(BUILDDIR) && $(MAKE) \
  top="$(top)" \
@@ -83,7 +87,7 @@ all : $(BUILDDIR)
 
 mostly_clean :
 	rm -f $(BUILDDIR)/*.mo $(BUILDDIR)/*.pot 
-	rm -f $(BUILDDIR)/.configured $(BUILDDIR)/*.o $(BUILDDIR)/dnsmasq.a $(BUILDDIR)/dnsmasq 
+	rm -f $(BUILDDIR)/$(COPTS_CONF_WILD) $(BUILDDIR)/*.o $(BUILDDIR)/dnsmasq.a $(BUILDDIR)/dnsmasq
 
 clean : mostly_clean
 	rm -f $(BUILDDIR)/dnsmasq_baseline
@@ -139,7 +143,7 @@ bloatcheck : $(BUILDDIR)/dnsmasq_baseline mostly_clean all
 
 # rules below are targets in recusive makes with cwd=$(BUILDDIR)
 
-.configured: $(hdrs)
+$(COPTS_CONF): $(hdrs)
 	@rm -f *.o
 	@touch $@
 
@@ -149,7 +153,7 @@ $(objs:.o=.c) $(hdrs):
 .c.o:
 	$(CC) $(CFLAGS) $(COPTS) $(i18n) $(build_cflags) $(RPM_OPT_FLAGS) -c $<	
 
-dnsmasq : .configured $(hdrs) $(objs)
+dnsmasq : $(COPTS_CONF) $(hdrs) $(objs)
 	$(CC) $(LDFLAGS) -o $@ $(objs) $(build_libs) $(LIBS) 
 
 dnsmasq.pot : $(objs:.o=.c) $(hdrs)
-- 
1.7.10.4