1#
2# Build targets for a Cortex-M-based processor
3#
4
5# Hexagon Environment Checks ###################################################
6
7# If building for the Cortex-M target, ensure that the user has specified a path
8# to the Cortex-M toolchain that they wish to use.
9ifeq ($(CORTEXM_TOOLS_PREFIX),)
10$(error "You must supply a CORTEXM_TOOLS_PREFIX environment variable \
11         containing a path to the Cortex-M toolchain. Example: \
12         export CORTEXM_TOOLS_PREFIX=$$HOME/bin/gcc-arm-none-eabi-5_3-2016q1")
13endif
14
15# Cortex-M Tools ###############################################################
16
17TARGET_AR = $(CORTEXM_TOOLS_PREFIX)/bin/arm-none-eabi-ar
18TARGET_CC = $(CORTEXM_TOOLS_PREFIX)/bin/arm-none-eabi-gcc
19TARGET_LD = $(CORTEXM_TOOLS_PREFIX)/bin/arm-none-eabi-ld
20
21# Cortex-M Compiler Flags ######################################################
22
23# Add Cortex-M compiler flags.
24TARGET_CFLAGS += $(CORTEXM_CFLAGS)
25
26# TODO: Add more Cortex-M flags from the Nanohub build
27
28# Code generation flags.
29TARGET_CFLAGS += -mthumb
30TARGET_CFLAGS += -mfloat-abi=softfp
31TARGET_CFLAGS += -mno-thumb-interwork
32TARGET_CFLAGS += -ffast-math
33TARGET_CFLAGS += -fsingle-precision-constant
34
35# Cortex-M Shared Object Linker Flags ##########################################
36
37TARGET_SO_LDFLAGS += -shared
38
39# Supported Cortex-M Architectures #############################################
40
41CORTEXM_SUPPORTED_ARCHS = m4
42
43# Environment Checks ###########################################################
44
45# Ensure that an architecture is chosen.
46ifeq ($(filter $(CORTEXM_ARCH), $(CORTEXM_SUPPORTED_ARCHS)),)
47$(error "The CORTEXM_ARCH argument must be set to a supported architecture (\
48         $(CORTEXM_SUPPORTED_ARCHS))")
49endif
50
51# Target Architecture ##########################################################
52
53# Set the Cortex-M architecture.
54ifeq ($(CORTEXM_ARCH), m4)
55TARGET_CFLAGS += -mcpu=cortex-m4
56TARGET_CFLAGS += -mfpu=fpv4-sp-d16
57endif
58
59# Optimization Level ###########################################################
60
61TARGET_CFLAGS += -O$(OPT_LEVEL)
62
63# Variant Specific Sources #####################################################
64
65TARGET_VARIANT_SRCS += $(CORTEXM_SRCS)
66