How to Create a Simple C Makefile for a Single Source File Project?

How to make a SIMPLE C Makefile

Creating a Makefile for a Simple C Project

Problem:

• Need to create a Makefile to compile a project consisting of a single C file (a3driver.cpp) that imports a class from another location ("/user/cse232/Examples/example32.sequence.cpp").

Answer:

Creating the Makefile:

1. Create a Makefile file.

2. Specify Variables:

   • CC: C compiler (e.g., gcc)
   • CXX: C compiler (e.g., g )
   • RM: Command for removing files (e.g., rm -f)
   • CPPFLAGS: Compilation flags (e.g., -g for debugging)
   • LDFLAGS: Linker flags (e.g., -g for debugging)
   • LDLIBS: Libraries to link (empty in this case)

3. Define Source and Object Files:

   • SRCS: List of C source files
   • OBJS: List of corresponding object files (generated using substitution)

4. Define Targets:

   • all: Main target, defaults to building the executable
   • tool: Executable name

5. Specify Dependencies:

   • Specify dependencies for the executable and object files (not needed as we'll use built-in rules)

6. Use Built-in Rules:

   • Makefile automatically handles compiling and linking tasks based on defined variables and target dependencies

7. Cleaning Targets:

   • clean: Removes object files
   • distclean: Removes all generated files

Makefile Example:

CC=gcc
CXX=g++
RM=rm -f
CPPFLAGS=-g
LDFLAGS=-g
LDLIBS=

SRCS=a3driver.cpp
OBJS=$(subst .cpp,.o,$(SRCS))

all: tool

tool: $(OBJS)
    $(CXX) $(LDFLAGS) -o tool $(OBJS) $(LDLIBS)

clean:
    $(RM) $(OBJS)

distclean: clean
    $(RM) tool

Running the Makefile:

• Open the terminal or command prompt.
• Navigate to the directory where the Makefile is located.
• Type "make" to build the project.
• This will create the executable file "tool" if the build is successful.

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