Kuk Linux 2023

Kuk Linux 2023

Kuk Linux 2023

Q5(1) :- What are different options of gee compiler options for :
(a) create only object files from test.c files.
(b) create executable files from test.c files.
( c) create executable files from object files.
( d) Debug the program and show warning.

GCC Compiler Options

The GCC (GNU Compiler Collection) compiler provides a variety of options to control the compilation process. Below are the specific options required for the tasks mentioned:

(a) Create Only Object Files from test.c Files

To create only object files from test.c files, use the -c option. This option compiles the source files without linking, resulting in object files.

Command

gcc -c test.c

Explanation:

  • gcc: The GNU Compiler Collection command.
  • -c: Compile source files without linking.

This command generates an object file named test.o from test.c.

(b) Create Executable Files from test.c Files

To create executable files from test.c files, compile and link the source file in one step. This is done without any special options apart from specifying the output file name.

Command:

gcc test.c -o executable_name

Explanation:

  • gcc: The GNU Compiler Collection command.
  • test.c: The source file.
  • -o executable_name: Specify the output file name for the executable.

This command compiles test.c and creates an executable named executable_name.

(c) Create Executable Files from Object Files

If you already have object files and want to create an executable, pass the object files to GCC for linking.

Command

gcc object_file1.o object_file2.o -o executable_name

Explanation:

  • gcc: The GNU Compiler Collection command.
  • object_file1.o object_file2.o: The object files to be linked.
  • -o executable_name: Specify the output file name for the executable.

This command links the object files object_file1.o and object_file2.o to create an executable named executable_name.

(d) Debug the Program and Show Warnings

To debug the program and show warnings, use the -g option for debugging symbols and -Wall to enable almost all warning messages.

Command:

gcc -g -Wall test.c -o executable_name

Explanation:

  • gcc: The GNU Compiler Collection command.
  • -g: Generate debugging information.
  • -Wall: Enable all the commonly used warning messages.
  • test.c: The source file.
  • -o executable_name: Specify the output file name for the executable.

This command compiles test.c with debugging symbols and enables warnings, creating an executable named executable_name.

Q5(2) :- Create makefile to execute and delete atleast two .c files.

Creating a Makefile to Execute and Delete .c Files

A Makefile is a file used by the make utility to automate the process of compiling and linking programs. Below is an example of a Makefile that compiles and links two .c files, and includes targets to delete the generated object files and executable.

Assume we have the following files:

  • main.c
  • util.c

Here is an example Makefile:

# Variables

CC = gcc

CFLAGS = -Wall -g

TARGET = myprogram

OBJECTS = main.o util.o

 

# Default target

all: $(TARGET)

 

# Rule to link the object files into an executable

$(TARGET): $(OBJECTS)

$(CC) $(OBJECTS) -o $(TARGET)

 

# Rule to compile main.c to main.o

main.o: main.c

$(CC) $(CFLAGS) -c main.c

 

# Rule to compile util.c to util.o

util.o: util.c

$(CC) $(CFLAGS) -c util.c

 

# Clean up the object files and the executable

clean:

rm -f $(OBJECTS) $(TARGET)

 

# Clean up the object files only

clean-obj:

rm -f $(OBJECTS)

 

Explanation

  1. Variables:

    • CC = gcc: Specifies the compiler to use.
    • CFLAGS = -Wall -g: Compiler flags (-Wall enables all warnings, -g includes debugging information).
    • TARGET = myprogram: The name of the executable to be created.
    • OBJECTS = main.o util.o: The list of object files to be generated.

  2. Default Target (all):

    • all: $(TARGET): The default target is to create the executable (myprogram).

  3. Linking Rule:

    • $(TARGET): $(OBJECTS): Links the object files to create the executable.
    • $(CC) $(OBJECTS) -o $(TARGET): The command to link the object files into the executable.

  4. Compilation Rules:

    • main.o: main.c: Compiles main.c into main.o.
    • $(CC) $(CFLAGS) -c main.c: The command to compile main.c.
    • util.o: util.c: Compiles util.c into util.o.
    • $(CC) $(CFLAGS) -c util.c: The command to compile util.c.

  5. Clean Targets:

    • clean: Deletes the object files and the executable.
rm -f $(OBJECTS) $(TARGET)
  • clean-obj: Deletes only the object files.
rm -f $(OBJECTS)

Usage

To use this Makefile, save it in the same directory as your .c files with the name Makefile. Then, you can run the following commands:

1. Compile and Link:

make

2. Clean Up All Files:

make clean

3. Clean Up Only Object Files:

make clean-obj

This Makefile automates the process of compiling, linking, and cleaning up your project, making development more efficient and error-free.

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