use a real build system (if you can call it that)

.gitignore

@@ -1,5 +1,7 @@
-vc140.pdb
+build.obj
 bin/
 obj/
 qemu.log
-disk.vhd
+disk.vhd
+code/build/build.exe
+code/build/build.exe.old

build.bat

@@ -1,322 +1,9 @@
 @echo off
-setlocal enabledelayedexpansion
-
-set ROOT=%~dp0.
-set SRC=%ROOT%\code
-set PUBLIC=%SRC%\public
-set COMMON=%SRC%\common
-set KERNEL=%SRC%\kernel
-set HAL=%KERNEL%\hal
-set USER=%SRC%\user
-set DRIVERS=%SRC%\drivers
-set THIRD_PARTY=%SRC%\third_party
-set VHD=%~dp0disk.vhd
-
-if not exist "%VHD%" (
-    call mkimage.bat
+:: If the build system binary doesn't exist, bootstrap it!
+if not exist "code\build\build.exe" (
+    echo Bootstrapping build system...
+    cl.exe /nologo /Fe"code\build\build.exe" "code\build\build.c"
 )
 
-if exist "obj" rd /s /q "obj"
-if exist "bin" rd /s /q "bin"
-
-mkdir "obj\boot"    2>nul
-mkdir "obj\kernel"  2>nul
-mkdir "obj\lwip"    2>nul
-mkdir "obj\hal"     2>nul
-mkdir "obj\syscall" 2>nul
-mkdir "obj\win32"   2>nul
-mkdir "obj\posix"   2>nul
-mkdir "obj\drivers" 2>nul
-mkdir "obj\init"    2>nul
-mkdir "obj\shell_win32"  2>nul
-mkdir "obj\shell_posix"  2>nul
-mkdir "obj\shell_native" 2>nul
-mkdir "obj\async_apc"    2>nul
-mkdir "obj\async_cancel" 2>nul
-mkdir "obj\edit"     2>nul
-mkdir "obj\httpget"  2>nul
-mkdir "obj\tcpserve" 2>nul
-mkdir "obj\udp"      2>nul
-mkdir "obj\resolve"  2>nul
-mkdir "obj\ping"     2>nul
-mkdir "obj\doom"     2>nul
-mkdir "obj\video"    2>nul
-mkdir "bin"          2>nul
-
-set INCLUDES=/I"%PUBLIC%" /I"%COMMON%\include" /I"%KERNEL%\include"
-set CFLAGS=/nologo /W3 /WX /Od /GS- /Gs999999 /Gz /Gy /EHsc- /GR- /Oi /Zi /std:c17 /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_WARNINGS %INCLUDES%
-set KERNEL_CFLAGS=%CFLAGS%
-
-rem lwIP is third-party freestanding C. Compile it into lwip.sys without /WX,
-rem and silence expected MSVC warnings from packed protocol headers and macros.
-set LWIP_ROOT=%DRIVERS%\net\lwip
-set LWIP_DRIVER_CFLAGS=%CFLAGS:/WX =% /I"%LWIP_ROOT%\include" /I"%THIRD_PARTY%\lwip\src\include" /wd4005 /wd4100 /wd4103 /wd4127 /wd4244 /wd4267 /wd4706
-
-set LFLAGS=/nologo /NODEFAULTLIB /DEBUG
-
-:: ---- Assemble ASM files ----
-echo Assembling...
-ml64 /nologo /c /Fo"obj\kernel\ke_switch.obj"      "%KERNEL%\ke_switch.asm"      || exit /b 1
-ml64 /nologo /c /Fo"obj\kernel\ke_syscall_asm.obj" "%KERNEL%\ke_syscall.asm"     || exit /b 1
-ml64 /nologo /c /Fo"obj\kernel\ke_gdt_reload.obj"  "%KERNEL%\ke_gdt_reload.asm"  || exit /b 1
-for %%f in (%SRC%\boot\uefi\*.asm) do (
-    ml64 /nologo /c /Fo"obj\boot\%%~nf.obj" "%%f" || exit /b 1
-)
-ml64 /nologo /c /Fo"obj\syscall\stubs.obj"         "%USER%\syscall\syscall_stubs.asm" || exit /b 1
-
-:: ---- Compile shared freestanding support ----
-cl /nologo /c /Fo"obj\libc.obj" "%COMMON%\libc.c" || exit /b 1
-cl %CFLAGS% /MP /c /Fo"obj\\" "%COMMON%\printf.c" "%COMMON%\ini_parser.c" || exit /b 1
-
-:: ---- Compile bootloader ----
-echo Compiling bootloader...
-cl %CFLAGS% /MP /c /I"%SRC%\boot\uefi\include" /Fo"obj\boot\\" "%SRC%\boot\uefi\*.c" || exit /b 1
-
-:: ---- Link bootloader ----
-echo Linking bootx64.efi...
-link %LFLAGS% /SUBSYSTEM:EFI_APPLICATION /ENTRY:UefiMain /OUT:"bin\bootx64.efi" ^
-    /PDB:"bin\bootx64.pdb" %SRC%\boot\uefi\efilib.lib obj\ini_parser.obj obj\libc.obj obj\boot\*.obj || exit /b 1
-
-:: ---- Compile HAL ----
-echo Compiling hal...
-cl %CFLAGS% /MP /c /Fo"obj\hal\\" "%HAL%\*.c" || exit /b 1
-
-:: ---- Link hal.dll ----
-echo Linking hal.dll...
-link %LFLAGS% /DLL /OUT:"bin\hal.dll" /ENTRY:HalInitialize /IGNORE:4216 obj\printf.obj obj\libc.obj obj\hal\*.obj || exit /b 1
-
-:: ---- Compile kernel ----
-echo Compiling kernel...
-cl %KERNEL_CFLAGS% /MP /c /Fo"obj\kernel\\" "%KERNEL%\*.c" || exit /b 1
-
-:: ---- Link kernel.exe ----
-echo Linking kernel.exe...
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:KernelMain /OUT:"bin\kernel.exe" /PDB:"bin\kernel.pdb" ^
-    bin\hal.lib obj\ini_parser.obj obj\printf.obj obj\libc.obj obj\kernel\*.obj || exit /b 1
-
-:: ---- Compile syscall.dll ----
-echo Compiling syscall.dll...
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL ^
-    /OUT:"bin\syscall.dll" obj\syscall\stubs.obj || exit /b 1
-
-:: ---- Compile win32.dll ----
-echo Compiling win32.dll...
-cl %CFLAGS% /MP /c /Fo"obj\win32\\" "%USER%\personalities\win32\*.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL ^
-    /OUT:"bin\win32.dll" bin\syscall.lib obj\libc.obj obj\win32\*.obj || exit /b 1
-
-:: ---- Compile posix.dll ----
-echo Compiling posix.dll...
-cl %CFLAGS% /MP /c /Fo"obj\posix\\" "%USER%\personalities\posix\*.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL ^
-    /OUT:"bin\posix.dll" bin\syscall.lib obj\libc.obj obj\posix\*.obj || exit /b 1
-
-:: ---- Compile drivers ----
-echo Compiling drivers...
-
-echo Compiling ide.sys...
-cl %CFLAGS% /c /Fo"obj\drivers\ide.obj" "%DRIVERS%\storage\ide\ide.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\ide.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\drivers\ide.obj || exit /b 1
-
-echo Compiling ahci.sys...
-cl %CFLAGS% /c /Fo"obj\drivers\ahci.obj" "%DRIVERS%\storage\ahci\ahci.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\ahci.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\drivers\ahci.obj || exit /b 1
-
-echo Compiling fat32.sys...
-cl %CFLAGS% /c /Fo"obj\drivers\fat32.obj" "%DRIVERS%\fs\fat32\fat32.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\fat32.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\drivers\fat32.obj || exit /b 1
-
-echo Compiling lwip.sys...
-set "LWIP_FILES="
-for /f "usebackq tokens=* delims=" %%f in ("%LWIP_ROOT%\lwip_sources.txt") do (
-    set "LWIP_FILE=%%f"
-    if not "!LWIP_FILE!"=="" if not "!LWIP_FILE:~0,1!"=="#" (
-        set "LWIP_WIN_FILE=!LWIP_FILE:/=\!"
-        set "LWIP_FILES=!LWIP_FILES! "%SRC%\!LWIP_WIN_FILE!""
-    )
-)
-cl %LWIP_DRIVER_CFLAGS% /MP /c /Fo"obj\lwip\\" !LWIP_FILES! || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\lwip.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\lwip\*.obj || exit /b 1
-
-echo Compiling usb.sys...
-cl %CFLAGS% /c /Fo"obj\drivers\usb.obj" "%DRIVERS%\bus\usb\usb.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\usb.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\drivers\usb.obj || exit /b 1
-
-echo Compiling rtl816x.sys...
-cl %CFLAGS% /c /Fo"obj\drivers\rtl816x.obj" "%DRIVERS%\net\rtl816x\rtl816x.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\rtl816x.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\drivers\rtl816x.obj || exit /b 1
-
-echo Compiling rtl8139.sys...
-cl %CFLAGS% /c /Fo"obj\drivers\rtl8139.obj" "%DRIVERS%\net\rtl8139\rtl8139.c" || exit /b 1
-link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:"bin\rtl8139.sys" /ENTRY:DriverEntry ^
-    bin\hal.lib bin\kernel.lib obj\libc.obj obj\drivers\rtl8139.obj || exit /b 1
-
-:: ---- Compile init ----
-echo Compiling init...
-cl %CFLAGS% /MP /c /Fo"obj\init\\" "%USER%\system\init\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:_start ^
-    /OUT:"bin\init.exe" /PDB:"bin\init.pdb" bin\syscall.lib obj\libc.obj obj\init\init.obj || exit /b 1
-
-:: ---- Compile shell_win32 ----
-echo Compiling shell_win32...
-cl %CFLAGS% /MP /c /Fo"obj\shell_win32\\" "%USER%\apps\shell_win32\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\shell_win32.exe" /PDB:"bin\shell_win32.pdb" bin\win32.lib obj\libc.obj obj\shell_win32\*.obj || exit /b 1
-
-:: ---- Compile shell_posix ----
-echo Compiling shell_posix...
-cl %CFLAGS% /MP /c /Fo"obj\shell_posix\\" "%USER%\apps\shell_posix\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\shell_posix.exe" /PDB:"bin\shell_posix.pdb" bin\posix.lib obj\libc.obj obj\shell_posix\*.obj || exit /b 1
-
-:: ---- Compile shell_native ----
-echo Compiling shell_native...
-cl %CFLAGS% /MP /c /Fo"obj\shell_native\\" "%USER%\apps\shell_native\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\shell_native.exe" /PDB:"bin\shell_native.pdb" bin\syscall.lib obj\libc.obj obj\shell_native\*.obj || exit /b 1
-
-:: ---- Compile async_apc ----
-echo Compiling async_apc...
-cl %CFLAGS% /MP /c /Fo"obj\async_apc\\" "%USER%\tests\async_apc\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\async_apc.exe" /PDB:"bin\async_apc.pdb" bin\syscall.lib obj\libc.obj obj\async_apc\*.obj || exit /b 1
-
-:: ---- Compile async_cancel ----
-echo Compiling async_cancel...
-cl %CFLAGS% /MP /c /Fo"obj\async_cancel\\" "%USER%\tests\async_cancel\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\async_cancel.exe" /PDB:"bin\async_cancel.pdb" bin\syscall.lib obj\libc.obj obj\async_cancel\*.obj || exit /b 1
-
-:: ---- Compile edit ----
-echo Compiling edit...
-cl %CFLAGS% /MP /c /Fo"obj\edit\\" "%USER%\apps\edit\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\edit.exe" /PDB:"bin\edit.pdb" bin\syscall.lib obj\libc.obj obj\edit\*.obj || exit /b 1
-
-:: ---- Compile httpget ----
-echo Compiling httpget...
-cl %CFLAGS% /MP /c /Fo"obj\httpget\\" "%USER%\apps\httpget\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\httpget.exe" /PDB:"bin\httpget.pdb" bin\syscall.lib obj\libc.obj obj\httpget\*.obj || exit /b 1
-
-:: ---- Compile tcpserve ----
-echo Compiling tcpserve...
-cl %CFLAGS% /MP /c /Fo"obj\tcpserve\\" "%USER%\apps\tcpserve\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\tcpserve.exe" /PDB:"bin\tcpserve.pdb" bin\syscall.lib obj\libc.obj obj\tcpserve\*.obj || exit /b 1
-
-:: ---- Compile udp ----
-echo Compiling udp...
-cl %CFLAGS% /MP /c /Fo"obj\udp\\" "%USER%\apps\udp\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\udp.exe" /PDB:"bin\udp.pdb" bin\syscall.lib obj\libc.obj obj\udp\*.obj || exit /b 1
-
-:: ---- Compile resolve ----
-echo Compiling resolve...
-cl %CFLAGS% /MP /c /Fo"obj\resolve\\" "%USER%\apps\resolve\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\resolve.exe" /PDB:"bin\resolve.pdb" bin\syscall.lib obj\libc.obj obj\resolve\*.obj || exit /b 1
-
-:: ---- Compile ping ----
-echo Compiling ping...
-cl %CFLAGS% /MP /c /Fo"obj\ping\\" "%USER%\apps\ping\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\ping.exe" /PDB:"bin\ping.pdb" bin\syscall.lib obj\libc.obj obj\ping\*.obj || exit /b 1
-
-:: ---- Compile doom ----
-echo Compiling doom...
-cl %CFLAGS% /MP /c /Fo"obj\doom\\" "%USER%\apps\doom\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\doom.exe" /PDB:"bin\doom.pdb" bin\syscall.lib obj\libc.obj obj\doom\*.obj || exit /b 1
-
-:: ---- Compile video player ----
-echo Compiling video...
-cl %CFLAGS% /MP /c /Fo"obj\video\\" "%USER%\apps\video\*.c" || exit /b 1
-link %LFLAGS% /SUBSYSTEM:NATIVE /ENTRY:main ^
-    /OUT:"bin\video.exe" /PDB:"bin\video.pdb" bin\win32.lib obj\libc.obj %USER%\apps\video\bink2w64.lib obj\video\*.obj || exit /b 1
-
-:: ---- Mount disk image ----
-echo Mounting disk.vhd...
-set DPS=%TEMP%\ntlite_mnt_%RANDOM%.txt
-(
-    echo select vdisk file="%VHD%"
-    echo attach vdisk
-    echo select partition 1
-    echo format fs=fat32 quick
-    echo assign letter=Z
-    echo select partition 2
-    echo format fs=fat32 quick
-    echo assign letter=Y
-    echo exit
-) > "%DPS%"
-diskpart /s "%DPS%"
-del "%DPS%"
-
-if not exist "Z:\" (
-    echo ERROR: Could not mount disk.vhd as Z:
-    echo If Z: is already in use, change the letter in build.bat and mkimage.bat.
-    exit /b 1
-)
-set DEST=Z:
-set DEST2=Y:
-
-:: ---- Copy to ESP layout ----
-echo Assembling ESP...
-mkdir "%DEST%\apps"     2>nul
-mkdir "%DEST2%\apps"    2>nul
-mkdir "%DEST%\system"   2>nul
-mkdir "%DEST%\drivers"  2>nul
-mkdir "%DEST%\EFI\BOOT" 2>nul
-copy /y "bin\bootx64.efi" "%DEST%\EFI\BOOT\"
-copy /y "bin\kernel.exe"  "%DEST%\system\colonel.exe"
-copy /y "bin\hal.dll"     "%DEST%\system\"
-copy /y "bin\syscall.dll" "%DEST%\system\"
-copy /y "bin\win32.dll"   "%DEST%\system\"
-copy /y "bin\posix.dll"   "%DEST%\system\"
-copy /y "%SRC%\settings.ini" "%DEST%\system\"
-copy /y "bin\ide.sys"     "%DEST%\drivers\"
-copy /y "bin\ahci.sys"    "%DEST%\drivers\"
-copy /y "bin\fat32.sys"   "%DEST%\drivers\"
-copy /y "bin\lwip.sys"    "%DEST%\drivers\"
-copy /y "bin\usb.sys"     "%DEST%\drivers\"
-copy /y "bin\rtl816x.sys" "%DEST%\drivers\"
-copy /y "bin\rtl8139.sys" "%DEST%\drivers\"
-copy /y "bin\init.exe"    "%DEST%\system\"
-copy /y "bin\shell_win32.exe"  "%DEST%\apps\"
-copy /y "bin\shell_posix.exe"  "%DEST%\apps\"
-copy /y "bin\shell_native.exe" "%DEST%\apps\"
-copy /y "bin\async_apc.exe"    "%DEST2%\apps\"
-copy /y "bin\async_cancel.exe" "%DEST2%\apps\"
-copy /y "bin\edit.exe"         "%DEST%\apps\"
-copy /y "bin\httpget.exe"      "%DEST%\apps\"
-copy /y "bin\tcpserve.exe"     "%DEST%\apps\"
-copy /y "bin\udp.exe"          "%DEST%\apps\"
-copy /y "bin\resolve.exe"      "%DEST%\apps\"
-copy /y "bin\ping.exe"         "%DEST%\apps\"
-copy /y "bin\doom.exe"         "%DEST%\apps\"
-copy /y "bin\video.exe"        "%DEST%\apps\"
-copy /y "%SRC%\boot.ini"       "%DEST%\"
-copy /y "%DRIVERS%\drivers.ini" "%DEST%\drivers\"
-if exist "%USER%\apps\video\bink2w64.dll" copy /y "%USER%\apps\video\bink2w64.dll" "%DEST%\apps\"
-if exist "%USER%\apps\video\video.bk2"    copy /y "%USER%\apps\video\video.bk2"    "%DEST%\apps\"
-if exist "%USER%\apps\doom\doom1.wad"     copy /y "%USER%\apps\doom\doom1.wad"     "%DEST%\apps\"
-
-:: ---- Unmount disk image ----
-echo Unmounting disk.vhd...
-set DPS=%TEMP%\ntlite_umnt_%RANDOM%.txt
-(
-    echo select vdisk file="%VHD%"
-    echo detach vdisk
-    echo exit
-) > "%DPS%"
-diskpart /s "%DPS%"
-del "%DPS%"
-
-echo.
-echo Build complete.
+:: Run the build system, passing any args along
+"code\build\build.exe" %*

code/build/build.c

@@ -0,0 +1,217 @@
+#define NOB_IMPLEMENTATION
+#include "nob.h"
+
+// Replicate your compiler and linker flags 
+const char *CFLAGS = "/nologo /W3 /WX /Od /GS- /Gs999999 /Gz /Gy /EHsc- /GR- /Oi /Z7 /std:c17 /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_WARNINGS /Icode\\public /Icode\\common\\include /Icode\\kernel\\include";
+const char *LWIP_CFLAGS = "/nologo /W3 /Od /GS- /Gs999999 /Gz /Gy /EHsc- /GR- /Oi /Z7 /std:c17 /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_WARNINGS /Icode\\public /Icode\\common\\include /Icode\\kernel\\include /Icode\\drivers\\net\\lwip\\include /Icode\\third_party\\lwip\\src\\include /wd4005 /wd4100 /wd4103 /wd4127 /wd4244 /wd4267 /wd4706";
+const char *LFLAGS = "/nologo /NODEFAULTLIB /DEBUG";
+
+void create_layout() {
+    const char *dirs[] = {
+        "obj", "bin", "obj\\boot", "obj\\kernel", "obj\\lwip", "obj\\hal", 
+        "obj\\syscall", "obj\\win32", "obj\\posix", "obj\\drivers", "obj\\init", 
+        "obj\\shell_win32", "obj\\shell_posix", "obj\\shell_native", 
+        "obj\\async_apc", "obj\\async_cancel", "obj\\edit", "obj\\httpget", 
+        "obj\\tcpserve", "obj\\udp", "obj\\resolve", "obj\\ping", "obj\\doom", "obj\\video"
+    };
+    for (size_t i = 0; i < NOB_ARRAY_LEN(dirs); i++) nob_mkdir_if_not_exists(dirs[i]);
+}
+
+// Helper to run a shell command string and wait for it
+bool run_sync(const char *cmd_str) {
+    Nob_Cmd cmd = {0};
+    nob_cmd_append(&cmd, "cmd.exe", "/c", cmd_str);
+    bool ok = nob_cmd_run_sync(cmd);
+    nob_cmd_free(cmd);
+    return ok;
+}
+
+// Helper to launch a shell command into the background
+Nob_Proc run_async(const char *cmd_str) {
+    Nob_Cmd cmd = {0};
+    nob_cmd_append(&cmd, "cmd.exe", "/c", cmd_str);
+    Nob_Proc proc = nob_cmd_run_async(cmd);
+    nob_cmd_free(cmd);
+    return proc;
+}
+
+int main(int argc, char **argv) {
+    // Magic macro: Checks if build.c is newer than build.exe and recompiles itself if so
+    NOB_GO_REBUILD_URSELF(argc, argv);
+
+    // 1. Initial Checks & Setup
+    if (!nob_file_exists("disk.vhd")) {
+        nob_log(NOB_INFO, "disk.vhd missing, calling mkimage.bat...");
+        if (!run_sync("mkimage.bat")) return 1;
+    }
+    create_layout();
+
+    // 2. Sequential Phase (Bootloader, Core Kernel, and DLLs)
+    nob_log(NOB_INFO, "--- Building Core Subsystems ---");
+    
+    const char *core_tasks[] = {
+        "ml64 /nologo /c /Foobj\\kernel\\ke_switch.obj code\\kernel\\ke_switch.asm",
+        "ml64 /nologo /c /Foobj\\kernel\\ke_syscall_asm.obj code\\kernel\\ke_syscall.asm",
+        "ml64 /nologo /c /Foobj\\kernel\\ke_gdt_reload.obj code\\kernel\\ke_gdt_reload.asm",
+        "ml64 /nologo /c /Foobj\\syscall\\stubs.obj code\\user\\syscall\\syscall_stubs.asm",
+        "for %f in (code\\boot\\uefi\\*.asm) do ml64 /nologo /c /Fo\"obj\\boot\\%~nf.obj\" \"%f\"",
+        
+        nob_temp_sprintf("cl %s /MP /c /Foobj\\ code\\common\\printf.c code\\common\\ini_parser.c", CFLAGS),
+        "cl /nologo /c /Foobj\\libc.obj code\\common\\libc.c",
+        
+        // Bootloader
+        nob_temp_sprintf("cl %s /MP /c /Icode\\boot\\uefi\\include /Foobj\\boot\\ code\\boot\\uefi\\*.c && link %s /SUBSYSTEM:EFI_APPLICATION /ENTRY:UefiMain /OUT:bin\\bootx64.efi code\\boot\\uefi\\efilib.lib obj\\ini_parser.obj obj\\libc.obj obj\\boot\\*.obj", CFLAGS, LFLAGS),
+        
+        // HAL
+        nob_temp_sprintf("cl %s /MP /c /Foobj\\hal\\ code\\kernel\\hal\\*.c && link %s /DLL /OUT:bin\\hal.dll /ENTRY:HalInitialize /IGNORE:4216 obj\\printf.obj obj\\libc.obj obj\\hal\\*.obj", CFLAGS, LFLAGS),
+        
+        // Kernel
+        nob_temp_sprintf("cl %s /MP /c /Foobj\\kernel\\ code\\kernel\\*.c && link %s /SUBSYSTEM:NATIVE /ENTRY:KernelMain /OUT:bin\\kernel.exe bin\\hal.lib obj\\ini_parser.obj obj\\printf.obj obj\\libc.obj obj\\kernel\\*.obj", CFLAGS, LFLAGS),
+        
+        // Subsystem DLLs
+        "link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:bin\\syscall.dll obj\\syscall\\stubs.obj",
+        nob_temp_sprintf("cl %s /MP /c /Foobj\\win32\\ code\\user\\personalities\\win32\\*.c && link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:bin\\win32.dll bin\\syscall.lib obj\\libc.obj obj\\win32\\*.obj", CFLAGS),
+        nob_temp_sprintf("cl %s /MP /c /Foobj\\posix\\ code\\user\\personalities\\posix\\*.c && link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:bin\\posix.dll bin\\syscall.lib obj\\libc.obj obj\\posix\\*.obj", CFLAGS)
+    };
+
+    for (size_t i = 0; i < NOB_ARRAY_LEN(core_tasks); i++) {
+        if (!run_sync(core_tasks[i])) return 1;
+    }
+
+    // 3. Parallel Phase (Drivers and Applications)
+    nob_log(NOB_INFO, "--- Compiling Drivers and Apps in Parallel ---");
+    Nob_Procs procs = {0};
+
+    // Queue standalone Drivers
+    const char *drivers[][2] = {
+        {"ide", "storage\\ide"}, 
+        {"ahci", "storage\\ahci"}, 
+        {"fat32", "fs\\fat32"}, 
+        {"usb", "bus\\usb"}, 
+        {"rtl816x", "net\\rtl816x"}, 
+        {"rtl8139", "net\\rtl8139"}
+    };
+
+    for (size_t i = 0; i < NOB_ARRAY_LEN(drivers); i++) {
+        const char *name = drivers[i][0];
+        const char *path = drivers[i][1];
+        
+        const char *cmd = nob_temp_sprintf(
+            "cl %s /c /Foobj\\drivers\\%s.obj code\\drivers\\%s\\%s.c && link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:bin\\%s.sys /ENTRY:DriverEntry bin\\hal.lib bin\\kernel.lib obj\\libc.obj obj\\drivers\\%s.obj", 
+            CFLAGS, name, path, name, name, name
+        );
+        nob_da_append(&procs, run_async(cmd));
+    }
+
+    // Parse lwIP Sources and Queue it
+    Nob_String_Builder sb = {0}, lwip_files = {0};
+    if (nob_read_entire_file("code\\drivers\\net\\lwip\\lwip_sources.txt", &sb)) {
+        Nob_String_View sv = nob_sv_from_parts(sb.items, sb.count);
+        while (sv.count > 0) {
+            Nob_String_View line = nob_sv_trim(nob_sv_chop_by_delim(&sv, '\n'));
+            if (line.count > 0 && line.data[0] != '#') {
+                nob_sb_append_cstr(&lwip_files, "code\\");
+                for (size_t i = 0; i < line.count; i++) nob_sb_append_buf(&lwip_files, &(char){line.data[i] == '/' ? '\\' : line.data[i]}, 1);
+                nob_sb_append_cstr(&lwip_files, " ");
+            }
+        }
+        nob_sb_append_null(&lwip_files);
+        nob_da_append(&procs, run_async(nob_temp_sprintf("cl %s /MP /c /Foobj\\lwip\\ %s && link /nologo /SUBSYSTEM:NATIVE /NODEFAULTLIB /DLL /OUT:bin\\lwip.sys /ENTRY:DriverEntry bin\\hal.lib bin\\kernel.lib obj\\libc.obj obj\\lwip\\*.obj", LWIP_CFLAGS, lwip_files.items)));
+    }
+
+    // Queue Subsystem Applications
+    const char *apps[][4] = {
+        // Folder, Libs, Name, Optional Extra Link Args
+        {"system\\init", "bin\\syscall.lib obj\\libc.obj", "init", "/ENTRY:_start"},
+        {"apps\\shell_win32", "bin\\win32.lib obj\\libc.obj", "shell_win32", "/ENTRY:main"},
+        {"apps\\shell_posix", "bin\\posix.lib obj\\libc.obj", "shell_posix", "/ENTRY:main"},
+        {"apps\\shell_native", "bin\\syscall.lib obj\\libc.obj", "shell_native", "/ENTRY:main"},
+        {"tests\\async_apc", "bin\\syscall.lib obj\\libc.obj", "async_apc", "/ENTRY:main"},
+        {"tests\\async_cancel", "bin\\syscall.lib obj\\libc.obj", "async_cancel", "/ENTRY:main"},
+        {"apps\\edit", "bin\\syscall.lib obj\\libc.obj", "edit", "/ENTRY:main"},
+        {"apps\\httpget", "bin\\syscall.lib obj\\libc.obj", "httpget", "/ENTRY:main"},
+        {"apps\\tcpserve", "bin\\syscall.lib obj\\libc.obj", "tcpserve", "/ENTRY:main"},
+        {"apps\\udp", "bin\\syscall.lib obj\\libc.obj", "udp", "/ENTRY:main"},
+        {"apps\\resolve", "bin\\syscall.lib obj\\libc.obj", "resolve", "/ENTRY:main"},
+        {"apps\\ping", "bin\\syscall.lib obj\\libc.obj", "ping", "/ENTRY:main"},
+        {"apps\\doom", "bin\\syscall.lib obj\\libc.obj", "doom", "/ENTRY:main"},
+        {"apps\\video", "bin\\win32.lib obj\\libc.obj code\\user\\apps\\video\\bink2w64.lib", "video", "/ENTRY:main"}
+    };
+
+    for (size_t i = 0; i < NOB_ARRAY_LEN(apps); i++) {
+        const char *cmd = nob_temp_sprintf(
+            "cl %s /MP /c /Foobj\\%s\\ code\\user\\%s\\*.c && link %s /SUBSYSTEM:NATIVE %s /OUT:bin\\%s.exe /PDB:bin\\%s.pdb %s obj\\%s\\*.obj",
+            CFLAGS, apps[i][2], apps[i][0], LFLAGS, apps[i][3], apps[i][2], apps[i][2], apps[i][1], apps[i][2]
+        );
+        nob_da_append(&procs, run_async(cmd));
+    }
+
+    // Wait for everything to link simultaneously
+    if (!nob_procs_wait(procs)) {
+        nob_log(NOB_ERROR, "One or more parallel build jobs failed!");
+        return 1;
+    }
+
+    // 4. Mounting & Packing Image
+    nob_log(NOB_INFO, "--- Mounting disk.vhd ---");
+    
+    // Resolve the absolute path to disk.vhd for diskpart
+    char vhd_path[MAX_PATH];
+    GetFullPathNameA("disk.vhd", MAX_PATH, vhd_path, NULL);
+
+    const char *diskpart_mnt = nob_temp_sprintf(
+        "select vdisk file=\"%s\"\nattach vdisk\n"
+        "select partition 1\nformat fs=fat32 quick\nassign letter=Z\n"
+        "select partition 2\nformat fs=fat32 quick\nassign letter=Y\nexit\n",
+        vhd_path
+    );
+    nob_write_entire_file("mnt.txt", diskpart_mnt, strlen(diskpart_mnt));
+    if (!run_sync("diskpart /s mnt.txt")) return 1;
+
+    nob_log(NOB_INFO, "--- Assembling ESP ---");
+    _mkdir("Z:\\apps");     _mkdir("Y:\\apps");
+    _mkdir("Z:\\system");   _mkdir("Z:\\drivers");
+    _mkdir("Z:\\EFI");      _mkdir("Z:\\EFI\\BOOT");
+
+    const char *copies[][2] = {
+        {"bin\\bootx64.efi", "Z:\\EFI\\BOOT\\bootx64.efi"}, {"bin\\kernel.exe", "Z:\\system\\colonel.exe"},
+        {"bin\\hal.dll", "Z:\\system\\hal.dll"},            {"bin\\syscall.dll", "Z:\\system\\syscall.dll"},
+        {"bin\\win32.dll", "Z:\\system\\win32.dll"},        {"bin\\posix.dll", "Z:\\system\\posix.dll"},
+        {"code\\settings.ini", "Z:\\system\\settings.ini"}, {"bin\\init.exe", "Z:\\system\\init.exe"},
+        
+        {"bin\\ide.sys", "Z:\\drivers\\ide.sys"},           {"bin\\ahci.sys", "Z:\\drivers\\ahci.sys"},
+        {"bin\\fat32.sys", "Z:\\drivers\\fat32.sys"},       {"bin\\lwip.sys", "Z:\\drivers\\lwip.sys"},
+        {"bin\\usb.sys", "Z:\\drivers\\usb.sys"},           {"bin\\rtl816x.sys", "Z:\\drivers\\rtl816x.sys"},
+        {"bin\\rtl8139.sys", "Z:\\drivers\\rtl8139.sys"},   {"code\\drivers\\drivers.ini", "Z:\\drivers\\drivers.ini"},
+        {"code\\boot.ini", "Z:\\boot.ini"},
+
+        {"bin\\shell_win32.exe", "Z:\\apps\\shell_win32.exe"}, {"bin\\shell_posix.exe", "Z:\\apps\\shell_posix.exe"},
+        {"bin\\shell_native.exe", "Z:\\apps\\shell_native.exe"}, {"bin\\edit.exe", "Z:\\apps\\edit.exe"},
+        {"bin\\httpget.exe", "Z:\\apps\\httpget.exe"},         {"bin\\tcpserve.exe", "Z:\\apps\\tcpserve.exe"},
+        {"bin\\udp.exe", "Z:\\apps\\udp.exe"},                 {"bin\\resolve.exe", "Z:\\apps\\resolve.exe"},
+        {"bin\\ping.exe", "Z:\\apps\\ping.exe"},               {"bin\\doom.exe", "Z:\\apps\\doom.exe"},
+        {"bin\\video.exe", "Z:\\apps\\video.exe"},
+
+        {"bin\\async_apc.exe", "Y:\\apps\\async_apc.exe"},     {"bin\\async_cancel.exe", "Y:\\apps\\async_cancel.exe"}
+    };
+
+    for (size_t i = 0; i < NOB_ARRAY_LEN(copies); i++) nob_copy_file(copies[i][0], copies[i][1]);
+
+    if (nob_file_exists("code\\user\\apps\\video\\bink2w64.dll")) nob_copy_file("code\\user\\apps\\video\\bink2w64.dll", "Z:\\apps\\bink2w64.dll");
+    if (nob_file_exists("code\\user\\apps\\video\\video.bk2"))    nob_copy_file("code\\user\\apps\\video\\video.bk2", "Z:\\apps\\video.bk2");
+    if (nob_file_exists("code\\user\\apps\\doom\\doom1.wad"))     nob_copy_file("code\\user\\apps\\doom\\doom1.wad", "Z:\\apps\\doom1.wad");
+
+    nob_log(NOB_INFO, "--- Unmounting disk.vhd ---");
+    const char *diskpart_umnt = nob_temp_sprintf(
+        "select vdisk file=\"%s\"\ndetach vdisk\nexit\n",
+        vhd_path
+    );
+    nob_write_entire_file("umnt.txt", diskpart_umnt, strlen(diskpart_umnt));
+    run_sync("diskpart /s umnt.txt");
+
+    remove("mnt.txt");
+    remove("umnt.txt");
+
+    nob_log(NOB_INFO, "Build complete!");
+    return 0;
+}