clean up build system
This fixes the compile/link steps to respect all the right flags.
BUG=chromium-os:31625
TEST=`make` still works
Change-Id: Ic70feedd20122b9bccb18e0f3e121c9dd82187ed
diff --git a/Makefile b/Makefile
index f32f072..c7da651 100644
--- a/Makefile
+++ b/Makefile
@@ -15,14 +15,17 @@
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
-CFLAGS=-O2 -Wall -g
+CFLAGS?=-O2 -g
+CFLAGS+=-Wall
CC?=gcc
+PKG_CONFIG?=pkg-config
em100: em100.c em100pro_chips.h
- $(CC) $(CFLAGS) -o $@ $< $(shell pkg-config --cflags --libs libusb-1.0)
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $< \
+ $(shell $(PKG_CONFIG) --cflags --libs libusb-1.0)
makechips: makechips.c
- $(CC) $(CFLAGS) -o $@ $<
+ $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ $<
em100pro_chips.h: makechips
./makechips.sh
