Minimal ASM files

linux.s

# Build command: gcc linux.s -o linux.out

.intel_syntax noprefix
.extern puts

.text

.globl main
main:
	lea	rdi, message
	call	puts
	ret

message: .asciz "Hello, World!"

windows.asm

; Command for the command line by using MinGW64:
; nasm -f win64 windows.asm -o windows.o && ld -o windows.exe windows.o -L /mingw64/x86_64-w64-mingw32/lib -lkernel32 -lmsvcrt

; ExitProcess is essential here
; otherwise you'd get SEGFAULT
extern ExitProcess
extern puts

section .data
message db "Hello, World!", 0

section .text
main:
  lea    rcx, [message]
  call   puts
  mov    ecx, eax
  call ExitProcess
  ret