Kludge to build Busybox using llvm-mingw, for armv7-w64-mingw32

build-zlib.sh

#!/bin/bash

# artynet/cross-compile-zlib-windows.sh

SRC=https://www.zlib.net/zlib-1.2.11.tar.gz
PREFIXDIR=$HOME/mingw64/armv7-w64-mingw32

if [ ! -d "zlib-1.2.11" ]; then
  wget $SRC
  tar xf zlib-1.2.11.tar.gz
fi
cd zlib-1.2.11

make -f win32/Makefile.gcc BINARY_PATH=$PREFIXDIR/bin INCLUDE_PATH=$PREFIXDIR/include LIBRARY_PATH=$PREFIXDIR/lib SHARED_MODE=1 PREFIX=armv7-w64-mingw32- install

HOW_TO_BUILD_BUSYBOX_ARM_MINGW

#install nori and nori-sanargs in $PATH

git clone https://github.com/khronii/busybox-w32.git
cd busybox-w32
make CROSS_COMPILE="armv7-w64-mingw32-" mingw32_defconfig
make CROSS_COMPILE="armv7-w64-mingw32-" LD="nori armv7-w64-mingw32-ld"

nori

#!/mingw64/bin/python

import os
import sys
import shutil
import subprocess

def split_args (args):
    out = "a.o"
    get_nextarg = False
    relocatable = False
    libs = list()
    misc_args = list()
    objects = list()

    for arg in args:
        if get_nextarg:
            out = arg
            get_nextarg = False
        elif arg.startswith("-r"):
            relocatable = True
        elif arg.startswith("--relocateable"):
            relocatable = True
        elif arg.startswith("-i"):
            relocatable = True
        elif arg.startswith("-l"):
            libs.append(arg)
        elif arg.startswith("--output"):
            out = arg[9:]
        elif arg.startswith("-o"):
            get_nextarg = True
        elif arg.endswith(".o"):
            objects.append(arg)
        else:
            misc_args.append(arg)

    return (relocatable, libs, misc_args, objects, out)

def unpack_objs (obj):
    libs = list()
    misc_args = list()
    objects = list()
    out = obj
    lines = False

    with open (os.path.join(os.path.abspath(obj), "objs.txt"), 'r') as file:
        lines = file.readlines()
        lines = [line.rstrip() for line in lines]
    libs = lines[1].split(" ")
    misc_args = lines[0].split(" ")
    objects = lines[2:]
    return (libs, misc_args, objects, out)
            

def pack_objs (libs, misc_args, objects, out):
    objdir = os.path.abspath(out)
    if not os.path.exists(objdir):
        os.mkdir(objdir)
    text = []
    text.append(misc_args)
    text.append(libs)
    for obj in objects:
        obj_name = os.path.basename(obj)
        if os.path.isdir(obj):
            (libs_2, misc_args_2, objects_2, out_2) = unpack_objs(obj)
            text[1] = text[1] + libs_2
                                         
            for obj_2 in objects_2:
                text.append (os.path.join(objdir, os.path.basename(obj_2)))
                shutil.copy (obj_2, objdir)
            if (" ".join(misc_args)) != (" ".join(misc_args_2)):
                print (" ".join(misc_args))
                print (" ".join(misc_args_2))
        elif os.path.isfile(obj):
            text.append(os.path.abspath(obj))
            shutil.copy(obj, os.path.join(objdir, obj_name))

    text[0] = " ".join(text[0])
    text[1] = " ".join(text[1])
    
    with open (os.path.join(objdir, "objs.txt"), 'w') as file:
        file.write("\n".join(text))

if __name__ == "__main__":
    wokrdir = os.getcwd()
    (rel, libs, misc_args, objects, out) = split_args (sys.argv[2:])
    if rel:
        pack_objs(libs, misc_args, objects, out)
    else:
        full_args = [sys.argv[1], "-o", out] + misc_args + libs
        for obj in objects:
            if os.path.isdir(obj):
                (libs_2, _, objects_2, _) = unpack_objs(obj)
                full_args = full_args + libs_2 + objects_2
        print(full_args)
        print(sys.argv)
        subprocess.run(full_args)
    

nori-sanargs

#!/mingw64/bin/python

import os
import sys
import shutil
import subprocess

def unpack_objs (obj):
    libs = list()
    misc_args = list()
    objects = list()
    out = obj
    lines = False

    with open (os.path.join(os.path.abspath(obj), "objs.txt"), 'r') as file:
        lines = file.readlines()
        lines = [line.rstrip() for line in lines]
    libs = lines[1].split(" ")
    misc_args = lines[0].split(" ")
    objects = lines[2:]
    return (libs, misc_args, objects, out)

if __name__ == "__main__":
    sanargs = list()
    for arg in sys.argv[1:]:
        if arg.startswith("-Wl,--warn"):
            continue
        if arg.endswith(".o") and os.path.isdir(arg):
            (libs, _, objects, _) = unpack_objs(arg)
            sanargs = sanargs + libs + objects
        else:
            sanargs.append(arg)
    print(sanargs)
    subprocess.run(sanargs)

OLD_HOW_TO_BUILD_BUSYBOX_ARM_MINGW

#install nori and nori-sanargs in $PATH
sed -e "s/try $CC/try nori-sanargs $CC/g" scripts/trylink
set -e "s/const ptr_to_globals;/BB_GLOBAL_CONST ptr_to_globals;/g" include/libbb.h #ptr_to_globals causes SEGFAULT w/o this
## remove L152-L185 from scripts/trylink
## https://github.com/rmyorston/busybox-w32/blob/c29dc205d2dc590f6d66df5a4f26efa7ada9632d/scripts/trylink#L152
## Lazy to create a patch RN

make CROSS_COMPILE="armv7-w64-mingw32-" mingw32_defconfig
make CROSS_COMPILE="armv7-w64-mingw32-" LD="nori ld" EXTRA_CFLAGS="-DBB_GLOBAL_CONST=''" #I would definitely go to legacy hell if I die
sed -e "s/ ffs(/ __builtin_ffs(/g" archival/gzip.c   #Fixes the last symbol error and causes re-compilation I guess
make CROSS_COMPILE="armv7-w64-mingw32-" LD="nori armv7-w64-mingw32-ld" EXTRA_CFLAGS="-DBB_GLOBAL_CONST=''"