build-busybox: Add a script for building busybox for Windows

build-busybox.sh

@@ -0,0 +1,93 @@
+#!/bin/sh
+#
+# Copyright (c) 2025 Martin Storsjo
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+set -e
+
+: ${BUSYBOX_VERSION:=90c68f18dc24fb3919811199f849fa2dc7a75294}
+
+BUILDDIR=build
+
+while [ $# -gt 0 ]; do
+    case "$1" in
+    --host=*)
+        HOST="${1#*=}"
+        BUILDDIR=$BUILDDIR-$HOST
+        ;;
+    *)
+        PREFIX="$1"
+        ;;
+    esac
+    shift
+done
+
+if [ -z "$CHECKOUT_ONLY" ]; then
+    if [ -z "$PREFIX" ]; then
+        echo $0 [--host=triple] dest
+        exit 1
+    fi
+
+    mkdir -p "$PREFIX"
+    PREFIX="$(cd "$PREFIX" && pwd)"
+fi
+
+MAKE=make
+if command -v gmake >/dev/null; then
+    MAKE=gmake
+fi
+
+: ${CORES:=$(nproc 2>/dev/null)}
+: ${CORES:=$(sysctl -n hw.ncpu 2>/dev/null)}
+: ${CORES:=4}
+
+if [ ! -d busybox-w32 ]; then
+    git clone https://github.com/rmyorston/busybox-w32
+    CHECKOUT=1
+fi
+
+SRC=$(pwd)
+
+cd busybox-w32
+
+if [ -n "$SYNC" ] || [ -n "$CHECKOUT" ]; then
+    [ -z "$SYNC" ] || git fetch
+    git checkout $BUSYBOX_VERSION
+fi
+
+[ -z "$CHECKOUT_ONLY" ] || exit 0
+
+[ -z "$CLEAN" ] || rm -rf $BUILDDIR
+mkdir -p $BUILDDIR
+make mingw64a_defconfig O=$BUILDDIR -j$CORES
+cd $BUILDDIR
+$MAKE -j$CORES CROSS_COMPILE=${HOST+$HOST-}
+cp ../LICENSE $PREFIX/LICENSE.txt
+mkdir -p $PREFIX/bin
+cp busybox.exe $PREFIX/bin
+
+WRAPPER_FLAGS="$WRAPPER_FLAGS -municode -D__USE_MINGW_ANSI_STDIO=0"
+
+${HOST+$HOST-}gcc $SRC/wrappers/busybox-wrapper.c -o $PREFIX/bin/busybox-wrapper.exe -O2 -Wl,-s $WRAPPER_FLAGS
+
+cc $SRC/wrappers/busybox-list-applets.c -I. -o busybox-list-applets
+./busybox-list-applets > applets.txt
+for i in $(cat applets.txt); do
+    case $i in
+    busybox|[*)
+        continue
+        ;;
+    esac
+    ln -s busybox-wrapper.exe $PREFIX/bin/$i.exe
+done

wrappers/busybox-list-applets.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025 Martin Storsjo
+ *
+ * This file is part of llvm-mingw.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdint.h>
+#define ALIGN1
+#define ALIGN2
+#define SKIP_applet_main
+#include "include/applet_tables.h"
+
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+    int offset = 0;
+    for (int i = 0; i < NUM_APPLETS; i++) {
+        printf("%s\n", &applet_names[offset]);
+        offset += strlen(&applet_names[offset]) + 1;
+    }
+    return 0;
+}

wrappers/busybox-wrapper.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018 Martin Storsjo
+ *
+ * This file is part of llvm-mingw.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "native-wrapper.h"
+
+int _tmain(int argc, TCHAR* argv[]) {
+    const TCHAR *dir;
+    const TCHAR *exe;
+    const TCHAR *basename, *target;
+    split_argv(argv[0], &dir, &basename, &target, &exe);
+    TCHAR *exe_path = concat(dir, _T("busybox.exe"));
+
+    return run_final(exe_path, (const TCHAR *const *) argv);
+}