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#include <stdio.h>
int main(){
	int seventyone = 71;
	int *pointertoseventyone = seventyone
	printf(pointertoseventyone)
}

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#include <stdio.h>
int main(){
	int seventyone = 71;
	int *pointertoseventyone = seventyone
	printf(*pointertoseventyone)
}

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kernel.o: In function `terminal_writestring':
kernel.c:(.text+0x160): undefined reference to `strlen'

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char strlen(const char[]);

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Installation process. Please add nasm, dd and ghost-i686-elf-tools to your "PATH" variable.
Current PATH:
C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;I:\ghost-i686-elf-tools\bin;C:\Users\(insert my username here)\AppData\Local\Microsoft\WindowsApps
Press any key to continue.
DOING THE BOOT.ASM COMPILATION
Any errors will be reported.
DOING THE KERNEL.C COMPILATION
Above with warnings ignored. Below with warnings not ignored. If there is nothing on both, your OS is practically perfect.
In file included from kernel.c:5:0:
include/kbd/kbd.c: In function 'getkey':
include/kbd/kbd.c:70:6: warning: variable 'key' set but not used [-Wunused-but-set-variable]
  int key;
      ^
kernel.c: In function 'kernel_main':
kernel.c:10:2: warning: implicit declaration of function 'newlinef123' [-Wimplicit-function-declaration]
  newlinef123();
  ^
kernel.c:14:2: warning: passing argument 1 of 'terminal_writestring' makes pointer from integer without a cast [enabled by default]
  terminal_writestring(Key);
  ^
In file included from kernel.c:4:0:
include/tty/tty.c:54:6: note: expected 'const char *' but argument is of type 'int'
 void terminal_writestring(const char* data) {
      ^
kernel.c: At top level:
kernel.c:16:6: warning: conflicting types for 'newlinef123' [enabled by default]
 void newlinef123(void){
      ^
kernel.c:10:2: note: previous implicit declaration of 'newlinef123' was here
  newlinef123();
  ^
kernel.c: In function 'newlinef123':
kernel.c:17:15: warning: operation on 'terminal_row' may be undefined [-Wsequence-point]
  terminal_row = terminal_row++;
               ^
In file included from kernel.c:5:0:
include/kbd/kbd.c: In function 'getkey':
include/kbd/kbd.c:72:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
C++ mode, warnings not ignored.
In file included from kernel.c++:5:0:
include/kbd/kbd.c: In function 'short unsigned int getkey()':
include/kbd/kbd.c:70:6: warning: variable 'key' set but not used [-Wunused-but-set-variable]
  int key;
      ^
include/kbd/kbd.c:72:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
kernel.c++: In function 'void kernel_main()':
kernel.c++:10:14: error: 'newlinef123' was not declared in this scope
  newlinef123();
              ^
kernel.c++:14:26: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
  terminal_writestring(Key);
                          ^
In file included from kernel.c++:4:0:
include/tty/tty.c:54:6: error:   initializing argument 1 of 'void terminal_writestring(const char*)' [-fpermissive]
 void terminal_writestring(const char* data) {
      ^
kernel.c++: In function 'void newlinef123()':
kernel.c++:17:31: warning: operation on 'terminal_row' may be undefined [-Wsequence-point]
  terminal_row = terminal_row++;
                               ^
LINKING...
If anything fails, check your code.
kernel.o: In function `terminal_writestring':
kernel.c:(.text+0x160): undefined reference to `strlen'
collect2.exe: error: ld returned 1 exit status
If there were no errors, everything went fine.

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#include <stdio.h>
int main(void){
	int seventyone = 71;
	int *pointertoseventyone = &seventyone;
	printf("%p\n", (void*)pointertoseventyone);
	return 0;
}

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#include <stdio.h>
int main(void){
	int seventyone = 71;
	int *pointertoseventyone = &seventyone;
	printf("%d\n", *pointertoseventyone);
	return 0;
}

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*.o
*.O
*.obj
.sh
*.bak
*.*~

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#first, set the paths where the files are to be found
# binary toolchain
BIN := I:/ghost-i686-elf-tools/bin
#
# Dixium source code path - set it to the current directory the Makefile is in
SRCPATH := . 
# system include headers
INCPATH := $(SRCPATH)/include:$(SRCPATH)/include/tty:$(SRCPATH)/include/kbd

# source code files required by the build
SRCFILES := $(SRCPATH)/kernel.c $(SRCPATH)/boot.asm $(INCPATH)/kbd/kbd.c $(INCPATH)/tty/tty.c

# header files required for the build
INCFILES := stdio.h stdlib.h include/tty/strings.h include/tty/vga.h include/kbd/stdio.h

# non-code files which should always be included with the code files
AUXFILES := Makefile README.md LICENSES

# list all the files that need to be distributed for the build, not
#including temporary files such as object or dependency files
DISTFILES := $(SRCFILES) $(INCFILES) $(AUXFILES)

# define the toolchain tools to be used and their settings
CC := $(BIN)/gcc
WARNINGS := -Wall -Wextra -pedantic -Wshadow -Wpointer-arith -Wcast-align \
            -Wwrite-strings -Wmissing-prototypes -Wmissing-declarations \
            -Wredundant-decls -Wnested-externs -Winline -Wno-long-long \
            -Wuninitialized -Wconversion -Wstrict-prototypes
# set the compile options used by all builds
CFLAGS := -g -O2 -std=c99 $(WARNINGS) -ffreestanding -I$(INCPATH)

# compile and/or link the sources into the files given by the target names
ASSEMBLE := nasm -t ELF
BUILD := $(CC) $(CFLAGS) -c $@
LINK := $(CC) $(CFLAGS) -o $@

#### build rules
#############

all: dixium

dixium: kernel kbd tty
	$(LINK) $(OBJFILES)

kernel: boot.asm kernel.c
	$(ASSEMBLE) boot.asm
	$(BUILD) kernel.c

kbd: $(INCPATH)/kbd/kbd.c
	$(BUILD) $(INCPATH)/kbd/kbd.c

tty: $(INCPATH)/tty/tty.c
	$(BUILD) $(INCPATH)/kbd/tty.c

clean:
	del *.o

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#define _GNU_SOURCE
#include "stdio.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>