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="[email protected]"
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,"[email protected]"
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

When asking a question please always include (via cut and paste and formatting, not paraphrasing or screenshot) the exact command you typed and the output error messages you got. In the case of problems compiling please also include the compiler invocation that caused the problem (this is printed out by make for example). — MadScientist

Robert Robert · Accepted Answer · 2020-09-30T14:09:07

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.

Include additional directories to Makefile

1 Answers