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#
# Definitions for a generic GNU ARM-EABI toolchain
#
$(info %% TOOLCHAIN gnu-arm-eabi)
CROSSDEV = arm-none-eabi-
CC = $(CROSSDEV)gcc
CXX = $(CROSSDEV)g++
CPP = $(CROSSDEV)gcc -E
LD = $(CROSSDEV)ld
AR = $(CROSSDEV)ar rcs
NM = $(CROSSDEV)nm
OBJCOPY = $(CROSSDEV)objcopy
OBJDUMP = $(CROSSDEV)objdump
# XXX this is pulled pretty directly from the fmu Make.defs - needs cleanup
MAXOPTIMIZATION = -O3
# base CPU flags
ARCHCPUFLAGS_CORTEXM4F = -mcpu=cortex-m4 \
-mthumb \
-march=armv7e-m \
-mfpu=fpv4-sp-d16 \
-mfloat-abi=hard
ARCHCPUFLAGS_CORTEXM4 = -mcpu=cortex-m4 \
-mthumb \
-march=armv7e-m \
-mfloat-abi=soft
ARCHCPUFLAGS_CORTEXM3 = -mcpu=cortex-m3 \
-mthumb \
-march=armv7-m \
-mfloat-abi=soft
ARCHCPUFLAGS = $(ARCHCPUFLAGS_$(CONFIG_ARCH))
ifeq ($(ARCHCPUFLAGS),)
$(error Must set CONFIG_ARCH to one of CORTEXM4F, CORTEXM4 or CORTEXM3)
endif
# optimisation flags
ARCHOPTIMIZATION = $(MAXOPTIMIZATION) \
-g \
-fno-strict-aliasing \
-fno-strength-reduce \
-fomit-frame-pointer \
-funsafe-math-optimizations \
-fno-builtin-printf \
-ffunction-sections \
-fdata-sections
# enable precise stack overflow tracking
# note - requires corresponding support in NuttX
INSTRUMENTATIONDEFINES = -finstrument-functions \
-ffixed-r10
ARCHCFLAGS = -std=gnu99
ARCHCXXFLAGS = -fno-exceptions -fno-rtti -std=gnu++0x
ARCHWARNINGS = -Wall \
-Wextra \
-Wdouble-promotion \
-Wshadow \
-Wfloat-equal \
-Wframe-larger-than=1024 \
-Wpointer-arith \
-Wlogical-op \
-Wmissing-declarations \
-Wpacked \
-Wno-unused-parameter
# -Wcast-qual - generates spurious noreturn attribute warnings, try again later
# -Wconversion - would be nice, but too many "risky-but-safe" conversions in the code
# -Wcast-align - would help catch bad casts in some cases, but generates too many false positives
ARCHCWARNINGS = $(ARCHWARNINGS) \
-Wbad-function-cast \
-Wstrict-prototypes \
-Wold-style-declaration \
-Wmissing-parameter-type \
-Wmissing-prototypes \
-Wnested-externs \
-Wunsuffixed-float-constants
ARCHWARNINGSXX = $(ARCHWARNINGS)
# pull in *just* libm from the toolchain ... this is grody
LIBM := $(shell $(CC) $(ARCHCPUFLAGS) -print-file-name=libm.a)
EXTRA_LIBS += $(LIBM)
CFLAGS = $(ARCHCFLAGS) \
$(ARCHCWARNINGS) \
$(ARCHOPTIMIZATION) \
$(ARCHCPUFLAGS) \
$(ARCHINCLUDES) \
$(INSTRUMENTATIONDEFINES) \
$(ARCHDEFINES) \
$(EXTRADEFINES) \
-fno-common \
$(addprefix -I,$(INCLUDE_DIRS))
CXXFLAGS = $(ARCHCXXFLAGS) \
$(ARCHWARNINGSXX) \
$(ARCHOPTIMIZATION) \
$(ARCHCPUFLAGS) \
$(ARCHXXINCLUDES) \
$(INSTRUMENTATIONDEFINES) \
$(ARCHDEFINES) \
$(EXTRADEFINES) \
$(addprefix -I,$(INCLUDE_DIRS))
CPPFLAGS = $(ARCHINCLUDES) \
$(INSTRUMENTATIONDEFINES) \
$(ARCHDEFINES) \
$(EXTRADEFINES) \
$(addprefix -I,$(INCLUDE_DIRS))
AFLAGS = $(CFLAGS) -D__ASSEMBLY__
LDFLAGS += --warn-common \
--gc-sections \
-T $(LDSCRIPT) \
$(addprefix -L,$(LIB_DIRS))
LIBGCC := $(shell $(CC) $(ARCHCPUFLAGS) -print-libgcc-file-name)
# files that the final link depends on
# XXX add libraries that we know about here...
LINK_DEPS += $(LDSCRIPT)
# files to include to get automated dependencies
DEP_INCLUDES = $(subst .o,.d,$(OBJS))
# compile C source $1 to object $2
# as a side-effect, generate a dependency file
define COMPILE
@echo "CC: $1"
@mkdir -p $(dir $2)
$(Q) $(CC) -MD -c $(CFLAGS) $(abspath $1) -o $2
endef
# compile C++ source $1 to $2
# as a side-effect, generate a dependency file
define COMPILEXX
@echo "CXX: $1"
@mkdir -p $(dir $2)
$(Q) $(CXX) -MD -c $(CXXFLAGS) $(abspath $1) -o $2
endef
# assemble $1 into $2
define ASSEMBLE
@echo "AS: $1"
@mkdir -p $(dir $2)
$(Q) $(CC) -c $(AFLAGS) $(abspath $1) -o $2
endef
# produce partially-linked $1 from files in $2
define PRELINK
@echo "PRELINK: $1"
@mkdir -p $(dir $1)
$(Q) $(LD) -Ur -o $1 $2 && $(OBJCOPY) --localize-hidden $1
endef
# update the archive $1 with the files in $2
define ARCHIVE
@echo "AR: $2"
@mkdir -p $(dir $1)
$(Q) $(AR) $1 $2
endef
# Link the objects in $2 into the binary $1
define LINK
@echo "LINK: $1"
@mkdir -p $(dir $1)
$(Q) $(LD) $(LDFLAGS) -o $1 $2 --start-group $(LIBS) $(EXTRA_LIBS) $(LIBGCC) --end-group
endef
# convert $1 from a linked object to a raw binary
define SYM_TO_BIN
@echo "BIN: $2"
@mkdir -p $(dir $2)
$(Q) $(OBJCOPY) -O binary $1 $2
endef
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