How to use Makefile on macOS? - c++

Question

On macOS, if I compile with
clang -I. -framework OpenGL main.cpp glad.c /usr/local/Cellar/glfw/3.3.1/lib/libglfw.3.3.dylib
I can build and run the generated executable from the following code:
#define GL_SILENCE_DEPRECATION
#include <stdio.h>
#include "glad/glad.h"
#include "/usr/local/Cellar/glfw/3.3.1/include/GLFW/glfw3.h"
int main(void)
{
GLFWwindow* window;
/* Initialize the library */
if (!glfwInit())
return -1;
/* Create a windowed mode window and its OpenGL context */
window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
if (!window)
{
glfwTerminate();
return -1;
}
/* Make the window's context current */
glfwMakeContextCurrent(window);
/* Loop until the user closes the window */
while (!glfwWindowShouldClose(window))
{
/* Render here */
glClearColor(0.9, 0.1, 0.1, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
/* Swap front and back buffers */
glfwSwapBuffers(window);
/* Poll for and process events */
glfwPollEvents();
}
glfwTerminate();
return 0;
}
But I would like to build using a Makefile, so I prepared
CC = clang
XXFLAGS = -g -Wall -v
CPPFLAGS = -I.
LDLIBS = -lm -L/usr/local/Cellar/glfw/3.3.1/lib -lglfw
LDFLAGS = -framework OpenGL
OBJS = main.o glad.o
PROGRAM = main
$(PROGRAM): $(OBJS)
$(CXX) $^ $(XXFLAGS) $(CPPFLAGS) $(LDLIBS) $(LDFLAGS) -o $#
clean:
-rm -f *.o
distclean: clean
-rm -Rf $(PROGRAM)
It actually makes the executable but when I run it I get
$ ./main
Segmentation fault: 11
So I guess there is something wrong in the Makefile, right?
$ make -n
c++ -I. -c -o main.o main.cpp
clang -I. -c -o glad.o glad.c
c++ main.o glad.o -g -Wall -v -I. -lm -L/usr/local/Cellar/glfw/3.3.1/lib -lglfw -framework OpenGL -o main

Answer 1

You didn't define the rule to build OBSJ, so make used its built-in rules. The PROGRAM rule only links object files, and there's no point specifying CPPFLAGS there.

Answer 2

.PHONNY: all
all: clean a.out
a.out:
clang++ -I glad/include -F /Library/frameworks -framework OpenGL main.cpp glad/src/glad.c /usr/local/Cellar/glfw/3.3.1/lib/libglfw.3.3.dylib
clean:
rm a.out
References:
https://www.gnu.org/software/make/manual/make.html
https://opensource.com/article/18/8/what-how-makefile