use clang to compile
This commit is contained in:
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0e09038871
commit
545b0be96e
55
Makefile
55
Makefile
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@ -45,15 +45,21 @@ LIB_OBJ = $(patsubst %.c,%.o,$(LIB_CSRC))
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# populates LIB_CSRC based on the library files used
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-include $(DEPENDENCIES)
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# executables
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# cross-compiler tools
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PREFIX ?= arm-none-eabi
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# compile using gcc (requires gcc-arm-none-eabi)
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CC := $(PREFIX)-gcc
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CXX := $(PREFIX)-g++
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LD := $(PREFIX)-gcc
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# compile using clang (requires clang gcc-multilib)
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CC := clang -target $(PREFIX)
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# link (requires binutils-arm-none-eabi)
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LD := $(PREFIX)-ld
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# create archive (requires binutils-arm-none-eabi)
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AR := $(PREFIX)-ar
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# compile assembly (requires binutils-arm-none-eabi)
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AS := $(PREFIX)-as
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OBJCOPY := $(PREFIX)-objcopy
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OBJDUMP := $(PREFIX)-objdump
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# debugger (requires)
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GDB := $(PREFIX)-gdb
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# opencm3 libraries
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@ -82,31 +88,38 @@ endif
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DEFS += -DSTM32F1 -D$(BOARD)
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# C flags
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CFLAGS += -Os -g
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CFLAGS += -std=c99 -Wpedantic -Wall -Werror -Wundef -Wextra -Wshadow -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes -Wstrict-overflow=5
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CFLAGS += -Os -g -std=c99 -nostdlib
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# TODO try to get rid of system libraries (and use -ffreestanding)
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CFLAGS += -fno-common -ffunction-sections -fdata-sections
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CFLAGS += -Wpedantic -Wall -Werror -Wundef -Wextra -Wshadow -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes -Wstrict-overflow=5
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CFLAGS += -I. -I$(INCLUDE_DIR) $(patsubst %,-I%,$(LIB))
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CFLAGS += $(DEFS)
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# linker flags
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LDFLAGS += --static -nostartfiles
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LDFLAGS += -L$(LIB_DIR)
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LDFLAGS += -I. $(patsubst %,-I%,$(LIB))
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LDFLAGS += -T$(LDSCRIPT)
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LDFLAGS += -Wl,-Map=$(*).map
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LDFLAGS += -Wl,--gc-sections
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ifeq ($(V),99)
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LDFLAGS += -Wl,--print-gc-sections
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endif
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# used libraries
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LDFLAGS += -static -nostartfiles -nostdlib
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# opencm3 libraries
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LDFLAGS += --library-path $(LIB_DIR)
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LIBNAME = opencm3_stm32f1
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LDLIBS += -lm -l$(LIBNAME)
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LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
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LDLIBS += --library $(LIBNAME)
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# TODO use newlib (providing libc, libm, and libg/libnosys) and get rib of the libgcc
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# curiously newlib seems to require libgcc (In function `_vfprintf_r': undefined reference to `__aeabi_dcmplt')
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# also even with libcc aliases are missing (In function `cdcacm_data_rx_cb': undefined reference to `__aeabi_memset')
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#LDFLAGS += --library-path /usr/lib/arm-none-eabi/newlib/armv7-m/
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# provides libgcc
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# TODO retrieve path automatically (arm-none-eabi-gcc does it on its own)
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LDFLAGS += --library-path /usr/lib/gcc/arm-none-eabi/*/armv7-m/
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# provides libc, libm, libnosys
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# TODO retrieve path automatically (arm-none-eabi-gcc does it on its own)
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LDFLAGS += --library-path /usr/arm-none-eabi/lib/armv7-m/
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# own libraries
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LDFLAGS += --dynamic-linker . $(patsubst %,--dynamic-linker %,$(LIB))
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# libc and other system libraries
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LDLIBS += --library c --library gcc --library nosys --library m
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# linker script for micro-controller
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LDFLAGS += -T $(LDSCRIPT)
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# device specific flags
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FP_FLAGS ?= -msoft-float
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ARCH_FLAGS = -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd
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ARCH_FLAGS = -mthumb -mcpu=cortex-m3
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# SWD adapter used
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# supported are : st-link v2 (STLINKV2), black magic probe (BMP)
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@ -146,7 +159,7 @@ list: $(BINARY).list
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%.elf: $(LDSCRIPT) $(LIB_DIR)/lib$(LIBNAME).a $(OBJ) $(LIB_OBJ)
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$(info compiling $(@))
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$(Q)$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJ) $(LIB_OBJ) $(LDLIBS) -o $(@)
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$(Q)$(LD) $(LDFLAGS) $(OBJ) $(LIB_OBJ) $(LDLIBS) -o $(@)
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$(Q)size $(@)
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%.o: %.c $(CHDR) $(LIB_CHDR)
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8
main.c
8
main.c
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@ -25,7 +25,6 @@
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#include <unistd.h> // standard streams
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#include <string.h> // string utilities
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#include <math.h> // mathematical utilities
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#include <errno.h> // error number utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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@ -40,7 +39,7 @@
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#include "global.h" // board definitions
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#include "usart.h" // USART utilities
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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#include "usart_soft.h" // software USART utilities
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#include "uart_soft.h" // software USART utilities
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/** @defgroup main_flags flag set in interrupts to be processed in main task
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* @{
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@ -74,7 +73,6 @@ int _write(int file, char *ptr, int len)
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}
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return i;
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}
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errno = EIO;
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return -1;
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}
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@ -147,8 +145,8 @@ int main(void)
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// setup USART and USB for user communication
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usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (for printing)
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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//setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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//setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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// minimal setup ready
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printf("welcome to the STM32F1 CuVoodoo example code\n"); // print welcome message
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