Include additional directories to Makefile

Question

I'm a student and I'm currently working with the Infineon XMC4700 uC and have recently started to programm small "libraries" for for certain hardware components. For that reason, I createded a directory for each project and placed the corresponding files to it to test each component in a separate main.c file. As long as the .h and .c files are located in the same directory as the actual main.c file I know what I have to change in my Makefile.

However, for reasons of clarity and comprehensibility I'd like to place all headers in a "src" directory and all .c-files in a directory "inc". For example, the current directory looks like this

~/EigeneProgramme/XMC4700/ShiftRegister
                               |_build
                               |_inc
                               |  |_ project.h
                               |_src
                               |  |_ project.c
                               |_main.c
                               |_Makefile

However, if I do this, the program does no longer compile. My first approach was to extend the VPATH variable to show the compiler the path to the required files.

The code below shows the declaration of certain variables in the currently used Makefile.

 CROSS_COMPILE=arm-none-eabi CC = $(CROSS_COMPILE)-gcc LD = $(CROSS_COMPILE)-gcc --specs=nosys.specs AR = $(CROSS_COMPILE)-ar AS = $(CROSS_COMPILE)-as OC = $(CROSS_COMPILE)-objcopy OD = $(CROSS_COMPILE)-objdump SZ = $(CROSS_COMPILE)-size ifeq ($(GDB_QUIET),true) DB = $(CROSS_COMPILE)-gdb -quiet else DB = $(CROSS_COMPILE)-gdb endif BUILDDIR = build LIB_BUILDDIR = lib_build USB_LIBDIR = $(XMC_LIBDIR)/ThirdPartyLibraries/USBlib/USB XMC_SERIES=4700 XMC_PACKAGE=F100 XMC_SIZE=2048 VPATH += $(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/BasicMathFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/CommonTables:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/ComplexMathFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/ControllerFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/FastMathFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/FilteringFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/MatrixFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/StatisticsFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/SupportFunctions:$(XMC_LIBDIR)/CMSIS/DSP_Lib/Source/TransformFunctions:$(XMC_LIBDIR)/CMSIS/Infineon/XMC$(XMC_SERIES)_series/Source:$(XMC_LIBDIR)/CMSIS/RTOS/RTX/SRC:$(XMC_LIBDIR)/CMSIS/RTOS/RTX/SRC/ARM:$(XMC_LIBDIR)/CMSIS/RTOS/RTX/Templates:$(XMC_LIBDIR)/CMSIS/RTOS/RTX/UserCodeTemplates:$(XMC_LIBDIR)/ThirdPartyLibraries/Newlib:$(XMC_LIBDIR)/XMCLib/src:$(USB_LIBDIR)/Class/Common:$(USB_LIBDIR)/Class/Device:$(USB_LIBDIR)/Common:$(USB_LIBDIR)/Core:$(USB_LIBDIR)/Core/XMC4000 CFLAGS = -I$(XMC_LIBDIR)/CMSIS/Include/ CFLAGS += -I$(XMC_LIBDIR)/CMSIS/Infineon/XMC$(XMC_SERIES)_series/Include/ CFLAGS += -I$(XMC_LIBDIR)/XMCLib/inc/ CFLAGS += -I$(USB_LIBDIR) CFLAGS += -I$(USB_LIBDIR)/Class CFLAGS += -I$(USB_LIBDIR)/Class/Common CFLAGS += -I$(USB_LIBDIR)/Class/Device CFLAGS += -I$(USB_LIBDIR)/Common CFLAGS += -I$(USB_LIBDIR)/Core CFLAGS += -I$(USB_LIBDIR)/Core/XMC4000 CFLAGS += -DXMC$(XMC_SERIES)_$(XMC_PACKAGE)x$(XMC_SIZE) CFLAGS += -mcpu=cortex-m4 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 -mthumb CFLAGS += -g3 -gdwarf-2 CFLAGS += -c CFLAGS += -Wa,-adhlns="$@.lst" SFLAGS = $(CFLAGS) CFLAGS +=$(SCFLAGS) SFLAGS += -Wall CFLAGS += -Wall CFLAGS += -ffunction-sections SFLAGS += -x assembler-with-cpp LFLAGS = -T$(BUILDDIR)/$(LD_NAME).ld -nostartfiles LFLAGS += -L$(XMC_LIBDIR)/CMSIS/Lib/GCC/ LFLAGS += -Wl,-Map,"$@.map" LFLAGS += -mcpu=cortex-m4 -mthumb LFLAGS += -g3 -gdwarf-2 LIBSRCS += startup_XMC$(XMC_SERIES).c system_XMC$(XMC_SERIES).c LIBSRCS += syscalls.c OBJS = $(patsubst %.c,$(BUILDDIR)/%.o,$(SRCS)) LIBOBJS = $(patsubst %.c,$(LIB_BUILDDIR)/%.o,$(LIBSRCS))

Unfortunately, I'm not very experienced with Makefiles. For that reason, I'm struggling to adjust the Makefile to compile the program.

So could somebody provide a solution how to adujust the above shown snipped of my current Makefile to compile the program?

Best regards

RadbaldMeyer

Answer 1

You should add a -I_inc in the CFLAGS .

CFLAGS += -I_inc

VPATH is for another usage, mostly used to generate object files in a directory different from source files. In this case, in _build . When GNU Make try to build the binaries files, let's say _build\\project.o , it will search for all the project.c in the VPATH list of directories. It will then compile the first project.c found and generate the corresponding project.o .