Makefile: add explicit rule for building *.o files

Change-Id: Ib886c0ef5fa5b1c62cb22eef017e9bf822b914b1
---
M src/Makefile
1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/Makefile b/src/Makefile
index f14f418..199b712 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -4,8 +4,11 @@
 
 MODS_LOG = gprs_l1.o gprs_rlc.o gprs_mac.o diag_gsm.o diag_log.o diag_log_gsm.o diag_log_gprs.o diag_log_wcdma.o diag_log_umts.o diag_log_qmi.o diag_dpl.o diag_log_simcard.o diag_event.o
 
+%.o: %.c
+	$(CC) $(CPPFLAGS) -c -o $@ $^
+
 osmo-qcdiag-log: diagchar_hdlc.o diag_io.o osmo-qcdiag-log.o diag_msg.o protocol.o diag_cmd.o $(MODS_LOG)
-	$(CC) $(CPPFLAGS) -o $@ $^ $(LIBS)
+	$(CC) $(LIBS) -o $@ $^
 
 clean:
 	@rm -f osmo-qcdiag-log *.o

