[RFC PATCH 1/2] Makefile: Make HOSTCFLAGS and HOSTCXXFLAGS user modifyable

[Markus Mayer <markus.mayer@linaro.org>]

In order to allow the user to pass extra arguments to the host
compiler, we no longer overwrite the host compiler flags in the
makefile, but append them to what was passed in.

Signed-off-by: Markus Mayer <markus.mayer@linaro.org>
---
 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 97b2861..5795eea 100644
--- a/Makefile
+++ b/Makefile
@@ -251,8 +251,8 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 
 HOSTCC       = gcc
 HOSTCXX      = g++
-HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
-HOSTCXXFLAGS = -O2
+HOSTCFLAGS   += -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
+HOSTCXXFLAGS += -O2
 
 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
 HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
-- 
1.9.1