Makefile strip + toolchain

Kernel binary optionally stripped for final distribution (and upload via
slow serial cable)
Custom cross-toolchain variables

Makefile

@@ -1,6 +1,10 @@
 .POSIX:
-CCX=arm-none-eabi-g++
+
+TOOLCHAIN=arm-none-eabi-
+
+CCX=$(TOOLCHAIN)g++
 CCFLAGS=-c -Wall -fno-stack-protector -ffreestanding -fno-exceptions -march=armv7-a -mno-unaligned-access -nostdlib -Iinclude -g
+STRIP=$(TOOLCHAIN)strip
 
 C_HDR=$(wildcard include/*.h)
 C_SRC=$(wildcard src/*.cpp)
@@ -13,6 +17,9 @@ A_OBJ=$(patsubst src/%.s, obj/s_%.o, $(A_SRC))
 
 all: environ bin/kernel.elf
 
+strip: bin/kernel.elf
+	$(STRIP) -s bin/kernel.elf
+
 environ:
 	mkdir -p bin
 	mkdir -p obj