os:=${shell uname -s}

OBJDIR?=obj
BINDIR?=exe


ifndef COMPILER
COMPILER=gcc
endif

ifeq (${COMPILER}, gcc)

PREFIX:=${shell type arm-stellaris-eabi-gcc > /dev/null 2>&1 && \
         echo arm-stellaris-eabi || echo arm-none-eabi}

CC=${PREFIX}-gcc

ARMGCC_ROOT:=${shell dirname '${shell sh -c "which ${CC}"}'}/..

CPU=-mcpu=cortex-m4
#FPU=-mfpu=fpv4-sp-d16 -mfloat-abi=softfp

AFLAGS=-mthumb \
       ${CPU}  \
       ${FPU}  \
       -MD

CFLAGS=-mthumb             \
       ${CPU}              \
       ${FPU}              \
       -ffunction-sections \
       -fdata-sections     \
       -MD                 \
       -std=c99            \
       -g 		   \
       -O0 		   \
       -c                  

AR=${PREFIX}-ar
LD=${PREFIX}-ld 

LDFLAGS=--gc-sections

# Get the location of libgcc.a from the GCC front-end.
LIBGCC:=${shell ${CC} -mthumb ${CFLAGS} -print-libgcc-file-name}

# Get the location of libc.a from the GCC front-end.
LIBC:=${shell ${CC} ${CFLAGS} -print-file-name=libc.a}

# Get the location of libm.a from the GCC front-end.
LIBM:=${shell ${CC} ${CFLAGS} -print-file-name=libm.a}

OBJCOPY=${PREFIX}-objcopy

CFLAGS+=${CFLAGSgcc}

AFLAGS+=${patsubst %,-I%,${subst :, ,${IPATH}}}
CFLAGS+=${patsubst %,-I%,${subst :, ,${IPATH}}}

${OBJDIR}/%.o: src/%.c
	${CC} ${CFLAGS} -D${COMPILER} -o ${@} ${<}

${OBJDIR}/%.o: common/%.c
	${CC} ${CFLAGS} -D${COMPILER} -o ${@} ${<}

${OBJDIR}/%.o: driverlib/%.c
	${CC} ${CFLAGS} -D${COMPILER} -o ${@} ${<}

${OBJDIR}/%.o: %.S
	${CC} ${AFLAGS} -D${COMPILER} -o ${@} -c ${<}

${BINDIR}/%.a:
	${AR} -cr ${@} ${^}

${BINDIR}/%.axf:
	@if [ 'x${SCATTERgcc_${notdir ${@:.axf=}}}' = x ];                    \
	 then                                                                 \
	     ldname="${ROOT}/gcc/standalone.ld";                              \
	 else                                                                 \
	     ldname="${SCATTERgcc_${notdir ${@:.axf=}}}";                     \
	 fi;                                                                  \
	 if [ 'x${VERBOSE}' = x ];                                            \
	 then                                                                 \
	     echo "  LD    ${@} ${LNK_SCP}";                                  \
	 else                                                                 \
	     echo ${LD} -T $${ldname}                                         \
	          --entry ${ENTRY_${notdir ${@:.axf=}}}                       \
	          ${LDFLAGSgcc_${notdir ${@:.axf=}}}                          \
	          ${LDFLAGS} -o ${@} $(filter %.o %.a, ${^})                  \
	          '${LIBM}' '${LIBC}' '${LIBGCC}';                            \
	 fi;                                                                  \
	${LD} -T $${ldname}                                                   \
	      --entry ${ENTRY_${notdir ${@:.axf=}}}                           \
	      ${LDFLAGSgcc_${notdir ${@:.axf=}}}                              \
	      ${LDFLAGS} -o ${@} $(filter %.o %.a, ${^})                      \
	      '${LIBM}' '${LIBC}' '${LIBGCC}'
	@${OBJCOPY} -O binary ${@} ${@:.axf=.bin}
endif