LAB4 Preparation

GCC (GNU Compiler Collection)

GCC is a compiler that compiles C, C++, and other languages into executable code. It’s widely used in many development environments, especially in Unix-like systems (like Linux).

Ex:gcc -o output_file source_file.c

Make and Makefile

Make is a utility that helps automate the process of building programs by checking which parts of the code need to be recompiled, and a Makefile is a script that defines how the program should be built, including which files to compile and the order in which tasks should be performed.

Example:

# Variables

CC = gcc

CFLAGS = -Wall -g

OBJ = main.o utils.o

TARGET = my_program

# Default target

all: $(TARGET)

# Create the executable from object files

$(TARGET): $(OBJ)

    $(CC) $(CFLAGS) -o $@ $^

# Compile .c files into .o files

%.o: %.c

    $(CC) $(CFLAGS) -c $< -o $@

# Clean up object files and executable

clean:

    rm -f *.o $(TARGET)

Example:(Ref:http://spo600.cdot.systems/doku.php?id=spo600:make_and_makefiles)

 CC=cc
 CFLAGS=-O3
 all:         half double
 half:        half.o sauce.o
              ${CC} ${CFLAGS} -o half half.o sauce.o
 double:      double.o sauce.o
              ${CC} ${CFLAGS} -o double double.o sauce.o
 half.o:      half.c number.h
              ${CC} ${CFLAGS} -c half.c
 double.o:    double.c number.h
              ${CC} ${CFLAGS} -c double.c
 sauce.o:     sauce.c
              ${CC} ${CFLAGS} -c sauce.c