[PATCH] build: initilize empty MCFLAGS and LDFLAGS

[Bertrand Jacquin]

Such variables are modified later, it make it clearer to read when
variable are only appened
---
 rules.mk | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/rules.mk b/rules.mk
index 110079efdaaa..3915268418d4 100644
--- a/rules.mk
+++ b/rules.mk
@@ -50,14 +50,17 @@ IINCDIR   = $(patsubst %,-I%,$(INCDIR))
 LLIBDIR   = $(patsubst %,-L%,$(LIBDIR))
 
 VPATH     = $(sort $(dir $(CSRC)))
+
+# Initilize empty LDFLAGS and MCFLAGS
+MCFLAGS =
+LDFLAGS =
+
 ###
 ifeq ($(EMULATION),)
-MCFLAGS   = -mcpu=$(MCU)
-LDFLAGS   = $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) \
+MCFLAGS   += -mcpu=$(MCU)
+LDFLAGS   += $(MCFLAGS) -nostartfiles -T$(LDSCRIPT) \
             -Wl,-Map=$(BUILDDIR)/$(PROJECT).map,--cref,--no-warn-mismatch,--gc-sections
 else
-MCFLAGS   =
-LDFLAGS   =
 DEFS      += -D_GNU_SOURCE
 endif