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Merge pull request #123 from bricky149/clang-build

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Add support for clang builds
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OneOfEleven 2023-10-05 12:44:47 +01:00 committed by GitHub
commit 0cf4e1fe36
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2 changed files with 43 additions and 10 deletions
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49
Makefile
View File

@ -3,6 +3,7 @@
# 0 = disable # 0 = disable
# 1 = enable # 1 = enable
# #
ENABLE_CLANG := 0
ENABLE_SWD := 0 ENABLE_SWD := 0
ENABLE_OVERLAY := 0 ENABLE_OVERLAY := 0
ENABLE_LTO := 1 ENABLE_LTO := 1
@ -39,7 +40,12 @@ ENABLE_COPY_CHAN_TO_VFO := 1
TARGET = firmware TARGET = firmware
ifeq ($(ENABLE_LTO), 1) ifeq ($(ENABLE_CLANG),1)
# GCC's linker, ld, doesn't understand LLVM's generated bytecode
ENABLE_LTO := 0
endif
ifeq ($(ENABLE_LTO),1)
# can't have LTO and OVERLAY enabled at same time # can't have LTO and OVERLAY enabled at same time
ENABLE_OVERLAY := 0 ENABLE_OVERLAY := 0
endif endif
@ -144,8 +150,20 @@ else
endif endif
AS = arm-none-eabi-gcc AS = arm-none-eabi-gcc
CC = arm-none-eabi-gcc
CC =
LD = arm-none-eabi-gcc LD = arm-none-eabi-gcc
ifeq ($(ENABLE_CLANG),0)
CC += arm-none-eabi-gcc
# Use GCC's linker to avoid undefined symbol errors
# LD += arm-none-eabi-gcc
else
# May need to adjust this to match your system
CC += clang --sysroot=/usr/arm-none-eabi --target=arm-none-eabi
# Bloats binaries to 512MB
# LD = ld.lld
endif
OBJCOPY = arm-none-eabi-objcopy OBJCOPY = arm-none-eabi-objcopy
SIZE = arm-none-eabi-size SIZE = arm-none-eabi-size
@ -161,13 +179,18 @@ ifeq ($(ENABLE_OVERLAY),1)
ASFLAGS += -DENABLE_OVERLAY ASFLAGS += -DENABLE_OVERLAY
endif endif
CFLAGS = -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c11 -MMD CFLAGS =
#CFLAGS = -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c99 -MMD ifeq ($(ENABLE_CLANG),0)
#CFLAGS = -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=gnu99 -MMD CFLAGS += -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c11 -MMD
#CFLAGS = -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=gnu11 -MMD # CFLAGS += -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c99 -MMD
# CFLAGS += -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=gnu99 -MMD
# CFLAGS += -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=gnu11 -MMD
else
# Oz needed to make it fit on flash
CFLAGS += -Oz -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delete-null-pointer-checks -std=c11 -MMD
endif
ifeq ($(ENABLE_LTO), 1) ifeq ($(ENABLE_LTO),1)
# CFLAGS += -flto
CFLAGS += -flto=2 CFLAGS += -flto=2
else else
# We get most of the space savings if LTO creates problems # We get most of the space savings if LTO creates problems
@ -276,12 +299,18 @@ ifeq ($(ENABLE_BAND_SCOPE),1)
CFLAGS += -DENABLE_BAND_SCOPE CFLAGS += -DENABLE_BAND_SCOPE
endif endif
LDFLAGS = -mcpu=cortex-m0 -nostartfiles -Wl,-T,firmware.ld LDFLAGS =
ifeq ($(ENABLE_CLANG),0)
LDFLAGS += -mcpu=cortex-m0 -nostartfiles -Wl,-T,firmware.ld
else
# Fix warning about implied executable stack
LDFLAGS += -z noexecstack -mcpu=cortex-m0 -nostartfiles -Wl,-T,firmware.ld
endif
# Use newlib-nano instead of newlib # Use newlib-nano instead of newlib
LDFLAGS += --specs=nano.specs LDFLAGS += --specs=nano.specs
ifeq ($(ENABLE_LTO), 0) ifeq ($(ENABLE_LTO),0)
# Throw away unneeded func/data sections like LTO does # Throw away unneeded func/data sections like LTO does
LDFLAGS += -Wl,--gc-sections LDFLAGS += -Wl,--gc-sections
endif endif

4
README.md
View File

@ -26,6 +26,7 @@ You can customize the firmware by enabling/disabling various compile options.
You'll find the options at the top of "Makefile" ('0' = disable, '1' = enable) .. You'll find the options at the top of "Makefile" ('0' = disable, '1' = enable) ..
``` ```
ENABLE_CLANG := 0 experimental, builds with clang instead of gcc (LTO will be disabled if you enable this)
ENABLE_SWD := 0 only needed if using CPU's SWD port (debugging/programming) ENABLE_SWD := 0 only needed if using CPU's SWD port (debugging/programming)
ENABLE_OVERLAY := 0 cpu FLASH stuff, not needed ENABLE_OVERLAY := 0 cpu FLASH stuff, not needed
ENABLE_LTO := 0 **experimental, reduces size of compiled firmware but might break EEPROM reads (overlay will be disabled if you enable this) ENABLE_LTO := 0 **experimental, reduces size of compiled firmware but might break EEPROM reads (overlay will be disabled if you enable this)
@ -88,6 +89,9 @@ arm-none-eabi GCC version 10.3.1 is recommended, which is the current version on
Other versions may generate a flash file that is too big. Other versions may generate a flash file that is too big.
You can get an appropriate version from: https://developer.arm.com/downloads/-/gnu-rm You can get an appropriate version from: https://developer.arm.com/downloads/-/gnu-rm
clang may be used but isn't fully supported. Resulting binaries may also be bigger.
You can get it from: https://releases.llvm.org/download.html
# Building # Building
To build the firmware, you need to fetch the submodules and then run make: To build the firmware, you need to fetch the submodules and then run make: