[SOLVED] Why can't Makefile find include directories

Issue

I can't seem to include a header in my test program using a Makefile.

I've attempted to try relative paths using -I with no luck. I'm new to Make and for some reason I am having a hard time understanding it's usage.

my code, test.cpp

#include <iostream>
#include <results/enumTest.h>

int main()
{
   return 0;
}

and my Makefile:

CFLAGS = -Wall -g -Wextra -Wpedantic -std=gnu++11 -m64 -Iinclude

test: test.o
    gcc $(CFLAGS) -I/.. -o  test test.o 

test.o: test.cpp
    gcc $(CFLAGS) -I/.. -c test.cpp

my directory structure:

/testDir/
  ./results/enuMtest.h
  ./test/test.cpp
  ./test/Makefile

I would hope that I could compile and then run the test software using a Makefile. This is more or less a tutorial for me.

Solution

Your include path -I/.. is invalid. You're trying to access the parent directory of the root directory, which cannot exist. Change your Makefile to use relative paths instead with -I..

This will access the parent directory as intended:

CFLAGS = -Wall -g -Wextra -Wpedantic -std=gnu++11 -m64 -Iinclude

test: test.o
    g++ $(CFLAGS) -I.. -o  test test.o # Change here

test.o: test.cpp
    g++ $(CFLAGS) -I.. -c test.cpp # ...and here

Note the removed slashes.

EDIT: As commented by @Lightness, you should include non-system headers with "header.h" rather than <header.h>. Additionally, since you are trying to compile a C++ program, it is recommended to use g++ instead of gcc (I've updated this in the snippet above).

Answered By - andreee

Answer Checked By - Mildred Charles (WPSolving Admin)