How to add a library (header + .c) compilation in MakeFile (Eclipse) ? - eclipse

Question

I'm working on a project, coding in C++, to develop a communication Modbus over TCP/IP between a Raspberry pi and an Arduino.
I have a basic exemple of "hello world" which works in Raspberry. I want to add the libmodbus library (.h and .c files) in my Eclipse Project, and test a server-unit-test provided. I have already added the directory in "Path and Symbol" (GNU C and GNU C++) and the "included ".
In the MakeFile, I have added the directory of the libmodbus file section (#Include paths). When I build the project, only the .h files are compiled, no the .c file. The "modbus.h" is recognized, but they are errors like "undefined reference to ....(modbus fonctions).
I have tested many solutions but it doesn't work yet.
Thanks in advance.
################################################################################
# MAKEFILE : RPi2Test01
################################################################################
#===============================================================================
# User compiling options
#===============================================================================
#HOST: PC, PCLINUX, ARM
HOST := PC
#HOST := PCLINUX
#HOST :: ARM
#TARGET: PC, ARM, RASPBERRYPI
#TARGET := PC
#TARGET := ARM
TARGET := RASPBERRYPI
#DEBUG: YES, NO
DEBUG := NO
#===============================================================================
# Compiling options
#===============================================================================
#-------------------------------------------------------------------------------
# Determine compiling environment #ENVIRONMENT: CYGWIN,LINUX,WCROSS,LCROSS,ARM
#-------------------------------------------------------------------------------
ifeq ($(HOST),PC)
ifeq ($(TARGET),PC)
ENVIRONMENT := CYGWIN
else
ENVIRONMENT := WCROSS
endif
else
ifeq ($(HOST),LINUXPC)
ifeq ($(TARGET),PC)
ENVIRONMENT := LINUX
else
ENVIRONMENT := LCROSS
endif
else
ifeq ($(HOST),ARM)
ENVIRONMENT := ARM
endif
endif
endif
#-------------------------------------------------------------------------------
# Customize: WIN32 (CYGWIN)
#-------------------------------------------------------------------------------
ifeq ($(ENVIRONMENT),CYGWIN)
PREFIX :=
BINPREFIX :=
CFLAGS := -std=gnu99 -Wno-write-strings
CFLAGS += -D_WIN32_ -D__CYGWIN__ -D_$(TARGET)_
CPPFLAGS := -pipe -g2 -Wall -Wno-write-strings -Wno-reorder
CPPFLAGS += -D_WIN32_ -D__CYGWIN__ -D_$(TARGET)_
LDFLAGS := -enable-auto-import
LIBEXT := .a
BINEXT := .exe
endif
#-------------------------------------------------------------------------------
# Customize: LINUX (LINUX)
#-------------------------------------------------------------------------------
ifeq ($(ENVIRONMENT),LINUX)
PREFIX :=
BINPREFIX :=
CFLAGS := -std=gnu99 -Wno-write-strings
CFLAGS += -D_LINUX_ -D_$(TARGET)_
CPPFLAGS := -Wno-write-strings -Wno-reorder
CPPFLAGS += -D_LINUX_ -D_$(TARGET)_
LDFLAGS := -g
LIBEXT := .a
BINEXT := .out
endif
#-------------------------------------------------------------------------------
# Customize: Cross-compiling CYGWIN to ARM-LINUX-LINARO (WCROSS)
#-------------------------------------------------------------------------------
ifeq ($(ENVIRONMENT),WCROSS)
PREFIX := arm-linux-gnueabihf-
BINPREFIX := /cygdrive/c/Linaro/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09/bin/
CFLAGS := -std=gnu99 -Wno-write-strings
CFLAGS += -D_LINUX_ -D_$(TARGET)_
CPPFLAGS := -Wno-write-strings -Wno-reorder
CPPFLAGS += -D_LINUX_ -D_$(TARGET)_
LDFLAGS := -g
LIBEXT := .a
BINEXT := .out
endif
#-------------------------------------------------------------------------------
# Customize: Cross-compiling LINUX to ARM-LINUX-LINARO (LCROSS)
#-------------------------------------------------------------------------------
ifeq ($(ENVIRONMENT),LCROSS)
PREFIX := arm-linux-gnueabihf-
BINPREFIX := /usr/local/Linaro/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09/bin/
CFLAGS := -std=gnu99 -Wno-write-strings
CFLAGS += -D_LINUX_ -D_$(TARGET)_
CPPFLAGS := -Wno-write-strings -Wno-reorder
CPPFLAGS += -D_LINUX_ -D_$(TARGET)_
LDFLAGS := -g
LIBEXT := .a
BINEXT := .out
endif
#-------------------------------------------------------------------------------
# Customize: ARM-LINUX-LINARO (ARM)
#-------------------------------------------------------------------------------
ifeq ($(ENVIRONMENT),ARM)
PREFIX :=
BINPREFIX :=
CFLAGS := -std=gnu99 -Wno-write-strings
CFLAGS += -D_LINUX_ -D_$(TARGET)_
CPPFLAGS := -Wno-write-strings -Wno-reorder
CPPFLAGS += -D_LINUX_ -D_$(TARGET)_
LDFLAGS := -g
LIBEXT := .a
BINEXT := .out
endif
#-------------------------------------------------------------------------------
# Compiling and linking features - Paths and libraries
#-------------------------------------------------------------------------------
CINC_PATH := $(INCLUDE)
CLIB_PATH := $(CLIB_PATH)
ifeq ($(ENVIRONMENT),ARM)
CINC_PATH += -I/usr/local/include
CLIB_PATH += -L/usr/local/lib
endif
ifeq ($(DEBUG),YES)
LIBSUBFIX := d
CPPFLAGS += -D_DEBUG_
else
LIBSUBFIX :=
CPPFLAGS +=
endif
LDADDLIBS += -lpthread -lrt -lm -lstdc++
#===============================================================================
# Building tools
#===============================================================================
CC := #$(BINPREFIX)$(PREFIX)gcc
CXX := #$(BINPREFIX)$(PREFIX)g++
LD := #$(BINPREFIX)$(PREFIX)ld
AR := #$(BINPREFIX)$(PREFIX)ar
MD := #mkdir -p
RM := #rm -rf
ECHO := #echo
#===============================================================================
# File pathts
#===============================================================================
SRCDIR := .
OBJPATH := ./OBJ
LIBPATH := ./LIB
GENPATH := ./BIN
#===============================================================================
# Source files
#===============================================================================
MAIN_HOME := $(SRCDIR)
CPP_SRCS_MAIN := $(MAIN_HOME)/RPi2Test01.cpp
#===============================================================================
# Object files
#===============================================================================
OBJS_MAIN := $(patsubst $(MAIN_HOME)/%.cpp, \
$(OBJPATH)/%.cpp.o, \
$(CPP_SRCS_MAIN))
#LIB_SRC := C:/libmodbus-3.0.6/src/%.c
#LIBSMAIN := $(patsubst C:/libmodbus-3.0.6/src/%.c, \
$(LIBPATH)/%.c.o, \
$(LIB_SRC))
#===============================================================================
# Building options
#===============================================================================
# Include paths
CINC_PATH += -I C:/libmodbus-3.0.6/src
CLIB_PATH += -L C:/libmodbus-3.0.6/src
CLIB_PATH += -L$(LIBPATH)
# Compiling and Linking options
CFLAGS := $(CINC_PATH) $(CFLAGS)
CPPFLAGS := $(CINC_PATH) $(CPPFLAGS)
LDFLAGS := $(CLIB_PATH) $(LDFLAGS)
#===============================================================================
# Building targets
#===============================================================================
BINMAIN := $(GENPATH)/RPi2Test01$(BINEXT)
#-------------------------------------------------------------------------------
# All targets
#-------------------------------------------------------------------------------
.PHONY: all
all: dirs $(BINMAIN)
#-------------------------------------------------------------------------------
# Building directories
#-------------------------------------------------------------------------------
dirs:
$(MD) $(OBJPATH)
$(MD) $(LIBPATH)
$(MD) $(GENPATH)
#-------------------------------------------------------------------------------
# Targets
#-------------------------------------------------------------------------------
$(BINMAIN): $(OBJS_MAIN) $(LIBSMAIN)
$(ECHO) 'Building target: $#'
$(CC) $(OBJS_MAIN) -o$# $(LDFLAGS) $(LDADDLIBS)
#-------------------------------------------------------------------------------
# Compiling
#-------------------------------------------------------------------------------
# File compiling: Main Programs ------------------------------------------------
$(OBJPATH)/%.cpp.o: $(MAIN_HOME)/%.cpp
$(ECHO) 'Building file: $<'
$(CXX) -c $(CPPFLAGS) -o$# $<
#===============================================================================
# Clean
#===============================================================================
.PHONY: clean
clean:
$(ECHO) 'Removing...'
$(RM) ${OBJPATH}/*.o ${OBJPATH}/*.err ${OBJPATH}/*.map
$(RM) ${GENPATH}/*.o ${GENPATH}/*.out ${GENPATH}/*.exe ${GENPATH}/*.tmp
$(RM) ${SRCDIR}/*.a ${OBJPATH}/*.a ${LIBPATH}/*.a ${GENPATH}/*.a
$(RM) ${SRCDIR}/*.so ${OBJPATH}/*.so ${LIBPATH}/*.so ${GENPATH}/*.so
$(RM) ${SRCDIR}/*.out.stackdump ${SRCDIR}/*.exe.stackdump
$(RM) ${GENPATH}/*.out.stackdump ${GENPATH}/*.exe.stackdump
$(RM) ${OBJPATH} ${LIBPATH} ${GENPATH}
$(RM) ./*.o ./*.out ./*.exe ./*.a ./*.so ./*.err ./*.map
$(RM) ./*.out.stackdump ./*.exe.stackdump
$(ECHO) 'Files removed'

Answer 1

You probably need to add -lmodbus to your LDADDLIBS variable:
LDADDLIBS += -lmodbus -lpthread -lrt -lm -lstdc++