Makefile that find any *.c *.s and folders with *.h. Target is ARM Devices. For use with VSCode or command line.

Makefile

#Part two of two files that recursivaly find and compile *.c *.s files 
#   and automatically adds folders with *.h files to gcc include option.
# Made for STM32F103 ARM devices and for use with VSCode
#   with few changes these files will work in any toolchain

include Makefile.inc
.SECONDEXPANSION:

DEFINES = -DSTM32F207xx -DARM_MATH_CM3
OUTOFCOMPILER = "./nocompile"

 #INCLUDES  := $(filter-out $(OUTOFCOMPILER) ,$(INCLUDES))
 #C  := $(filter-out $(OUTOFCOMPILER), $(C))
 #S  := $(filter-out $(OUTOFCOMPILER) , $(S)) 

CC_FLAGS += $(INCLUDES) $(DEFINES) -mcpu=cortex-m3  -mthumb -mlittle-endian  -Wall -fdata-sections -ffunction-sections 
CC_FLAGS += -Wstrict-prototypes -fverbose-asm -nostdlib -pipe

LD_FLAGS += -lm
LD_FLAGS +=  -mthumb -mcpu=cortex-m3 -Wl,-Map=project.map,--cref,--no-warn-mismatch 
LD_FLAGS += -nostartfiles -specs=nano.specs -TSTM32F217IGHx_FLASH.ld -Wl,--gc-sections

LIBPATH = /usr/arm-none-eabi/lib/thumb/
LIBS = $(LIBPATH)libm.a $(LIBPATH)libc_nano.a

.PHONY:  clean flash

O  = $(C:%.c=%.o)
O += $(S:%.s=%.o)
O += $(Supper:%.S=%.o)

ifeq ($(TARGET), release)
	ELF = bin/release.elf
	CC_FLAGS += -O3 -DRELEASE
	OBJPATH = obj/release
else
	ELF = bin/debug.elf
	CC_FLAGS += -g -O0 -DDEBUG
	OBJPATH = obj/debug
endif

OBJ = $(addprefix $(OBJPATH)/, $(O))


all: makepath build

build: $(OBJ) 
	@echo ---- LINKING ----
	@$(CC) $(OBJ) $(LIBS) $(LD_FLAGS)  -o $(ELF) 
	@$(OBJCOPY) -O ihex $(ELF) $(ELF:%.elf=%.hex)
	@$(OBJCOPY) -O srec $(ELF) $(ELF:%.elf=%.s19)
	@$(OBJCOPY) -O binary $(ELF)  $(ELF:%.elf=%.bin)
	@$(NM)  $(ELF) 
	@echo 
	@$(SIZE)  --format=Berkeley $(ELF) 

	@echo ---- FINISHED ----

makepath: 
	@mkdir -p $(dir $(OBJ))	


$(OBJPATH)/%.o:%.c
	@echo ---- C ----
	$(CC) $(CC_FLAGS) -c $<  -o $@

$(OBJPATH)/%.o:%.s
	@echo ---- S ----
	$(CC) $(CC_FLAGS) -c $<  -o $@

$(OBJPATH)/%.o:%.S
	@echo ---- S ----
	$(CC) $(CC_FLAGS) -c $<  -o $@

flash:
	@echo ---- FLASHING ----
	st-flash erase
	st-flash --reset write  $(ELF:%.elf=%.bin) 0x08000000
	$(SIZE) -A -d $(ELF)
	@$(OBJDUMP) -d -M force-thumb -S $(ELF) >  $(ELF:%.elf=%.lst)

clean:
	@echo ---- CLEANING ----
	@rm -R ./obj/debug/*
	@rm -R ./obj/release/*
	@rm     ./bin/*
	@find -name *.elf -delete

rebuild: clean 
	@echo ---- REBUILD ALL ----
	@make TARGET=release
	@make TARGET=debug

debugmake:
	@echo $(O)
	@echo $(Supper)

Makefile Recursively - HOW TO USE

make TARGET=release
make TARGET=debug

Features:
  All objects files will be located in release/obj or debug/obj
  elf, hex, srec, bin files located in bin folder
  Project structured as folder. Simple put files in any folder and make it!
  Generate map file.
  Shows size info of sections and ELF's symbols (functions)

Makefile.inc

# Head make file include 
# This file is one of two files that:
#  - Find folders with *.h files and add this path do INCLUDES
# -  Find *.c and *.s files and add its to C and S variables

# Part two do:
# - Compile any *.c and *.s file in own folder in subfolder obj/release or obj/debug 
# - Include folders ( folders with *.h files) are added to gcc automatically
# - These files targets  ARM devices however with few changes it will be work on any toolchain


 H   = $(shell find . -name "*.h" -exec dirname {} \; | sort -u)
 C   = $(subst ./,,$(shell find . -name "*.c"))
 S   = $(subst ./,,$(shell find . -name "*.s"))
 Supper = $(subst ./,,$(shell find . -name "*.S"))  # sporadic upper 's' extensions
 INCLUDES = $(addprefix -I,$(H))
 

export CROSS_COMPILE ?= arm-none-eabi-
export CC = $(CROSS_COMPILE)gcc
export LD = $(CROSS_COMPILE)ld
export OBJDUMP = $(CROSS_COMPILE)objdump
export OBJCOPY = $(CROSS_COMPILE)objcopy
export SIZE = $(CROSS_COMPILE)size
export NM = $(CROSS_COMPILE)nm