Cherry-pick extra toolchain Makefile options

Makefile

@@ -11,6 +11,28 @@ ifdef DEBUG
 else
 	CFLAGS_EXTRA=-O2
 endif
+CFLAGS_EXTRA  += -fPIC --std=gnu99
+LDFLAGS_EXTRA += -Wl,--relax,--gc-sections
+
+TOOLCHAIN		:= $(shell $(CC) --version|awk '/Debian/ {print "debian";exit;}')
+#
+# This bit adds extra flags depending of the distro, and the
+# architecture. To make sure debian packages have the right
+# set of 'native' flags on them
+#
+ifeq ($(TOOLCHAIN),debian)
+DEBARCH			:= $(shell dpkg-architecture -qDEB_BUILD_ARCH)
+ifeq ($(DEBARCH),$(filter $(DEBARCH),amd64 i386))
+CFLAGS_EXTRA	+= -march=native
+endif
+ifeq ($(DEBARCH),armhf)
+CFLAGS_EXTRA	+=  -march=armv7-a -mtune=cortex-a8 -mfpu=neon
+endif
+LDFLAGS_EXTRA	+= -L$(LIB) -Wl,-rpath,${shell readlink -f ${LIB}}
+else
+LDFLAGS_EXTRA	+= -L$(LIB) -Wl,-rpath-link,$(LIB)
+endif
+
 
 # The -Wunreachable-code warning is only implemented in clang, but it
 # doesn't break anything for gcc to see it.
@@ -23,6 +45,7 @@ WARNINGS=-Wall \
 CCFLAGS=-D_GNU_SOURCE=1 $(WARNINGS) $(CFLAGS_EXTRA) $(CFLAGS)
 LLDFLAGS=-lrt -lev $(LDFLAGS_EXTRA) $(LDFLAGS)
 
+
 CC?=gcc
 
 LIBS=-lpthread
@@ -31,6 +54,7 @@ COMPILE=$(CC) $(INC) -c $(CCFLAGS)
 SAVEDEP=$(CC) $(INC) -MM $(CCFLAGS)
 LINK=$(CC) $(LLDFLAGS) -Isrc $(LIBS)
 
+LIB=build/
 
 EXISTING_OBJS := $(wildcard build/*.o)
 -include $(EXISTING_OBJS:.o=.d)