#******************************************************************************
#
# Get the operating system name.  If this is Cygwin, the .d files will be
# munged to convert c: into /cygdrive/c so that "make" will be happy with the
# auto-generated dependencies.
#
#******************************************************************************
os:=${shell uname -s}

#******************************************************************************
#
# The compiler to be used.
#
#******************************************************************************
ifndef COMPILER
COMPILER=gcc
endif

#******************************************************************************
#
# Definitions for using GCC.
#
#******************************************************************************
ifeq (${COMPILER}, gcc)

#
# The command for calling the compiler.
#
CC=arm-none-eabi-gcc

#
# The location of the C compiler
# ARMGCC_ROOT is used by some makefiles that need to know where the compiler
# is installed.
#
ARMGCC_ROOT:=${shell dirname '${shell sh -c "which ${CC}"}'}/..

#
# Set the compiler CPU/FPU options.
#
CPU=-mcpu=cortex-m4
FPU=-mfpu=fpv4-sp-d16 -mfloat-abi=hard

#
# The flags passed to the assembler.
#
AFLAGS=-mthumb \
       ${CPU}  \
       ${FPU}  \
       -MD

#
# The flags passed to the compiler.
#
CFLAGS=-mthumb             \
       ${CPU}              \
       ${FPU}              \
       -ffunction-sections \
       -fdata-sections     \
       -MD                 \
       -std=c99            \
       -Dgcc               \
       -D${PART}           \
       -specs=nano.specs   \
       -c

#
# The command for calling the library archiver.
#
AR=arm-none-eabi-ar

#
# The command for calling the linker.
#
LD=arm-none-eabi-ld

#
# The flags passed to the linker.
#
LDFLAGS= --gc-sections

#
# The command for extracting images from the linked executables.
#
OBJCOPY=arm-none-eabi-objcopy

#
# Tell the compiler to include debugging information if the DEBUG environment
# variable is set.
#
# ifdef DEBUG
# CFLAGS+=-g -D DEBUG -O0
# else
# CFLAGS+=-Os
# endif
CFLAGS+=-g -Os

#
# Add the tool specific CFLAGS.
#
CFLAGS+=${CFLAGSgcc}

#
# Add the include file paths to AFLAGS and CFLAGS.
#
AFLAGS+=${patsubst %,-I%,${subst :, ,${IPATH}}}
CFLAGS+=${patsubst %,-I%,${subst :, ,${IPATH}}}

#
# The rule for building the object file from each C source file.
#
${COMPILER}${SUFFIX}/%.o: %.c
	@if [ 'x${VERBOSE}' = x ];                            \
	 then                                                 \
	     echo "  CC          ${<}";                             \
	 else                                                 \
	     echo ${CC} ${CFLAGS} -D${COMPILER} -o ${@} ${<}; \
	 fi
	@${CC} ${CFLAGS} -D${COMPILER} -o ${@} ${<}
ifneq ($(findstring CYGWIN, ${os}), )
	@sed -i -r 's/ ([A-Za-z]):/ \/cygdrive\/\1/g' ${@:.o=.d}
endif

#
# The rule for building the object file from each assembly source file.
#
${COMPILER}${SUFFIX}/%.o: %.S
	@if [ 'x${VERBOSE}' = x ];                               \
	 then                                                    \
	     echo "  AS          ${<}";                                \
	 else                                                    \
	     echo ${CC} ${AFLAGS} -D${COMPILER} -o ${@} -c ${<}; \
	 fi
	@${CC} ${AFLAGS} -D${COMPILER} -o ${@} -c ${<}
ifneq ($(findstring CYGWIN, ${os}), )
	@sed -i -r 's/ ([A-Za-z]):/ \/cygdrive\/\1/g' ${@:.o=.d}
endif

#
# The rule for creating an object library.
#
${COMPILER}${SUFFIX}/%.a:
	@if [ 'x${VERBOSE}' = x ];     \
	 then                          \
	     echo "  AR          ${@}";      \
	 else                          \
	     echo ${AR} -cr ${@} ${^}; \
	 fi
	@${AR} -cr ${@} ${^}

endif