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Index: tools/build/cross-build-macos.sh
===================================================================
--- /dev/null
+++ tools/build/cross-build-macos.sh
@@ -0,0 +1,118 @@
+#!/bin/sh
+# Copyright (c) Mar 2025 Wolfram Schneider <wosch@FreeBSD.org>
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# cross-build-macos.sh - build FreeBSD/arm64 from source on MacOS
+# for MacOS 14.x and later
+#
+# Note: you need to install a new compiler and linker
+# with Homebrew first: brew install llvm lld
+#
+# Homebrew will install the Command Line Tools for Xcode as well.
+# If not, you can install them with: xcode-select --install
+#
+# get the FreeBSD source:
+# git clone https://codeberg.org/freebsd/freebsd-src
+# cd freebsd-src && ./tools/build/cross-build-macos.sh
+#
+
+
+set -e
+
+HOMEBREW_PATH="/opt/homebrew/opt/llvm/bin:/opt/homebrew/bin"
+PATH="$HOMEBREW_PATH:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin"; export PATH
+clt_sdk_dir="/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk"
+
+: ${TMPDIR="/tmp"}
+: ${MAKEOBJDIRPREFIX="$TMPDIR/freebsd-obj"}; export MAKEOBJDIRPREFIX
+: ${nice_cmd="nice -n10 time"}
+
+: ${TARGET="arm64"}
+: ${TARGET_ARCH="aarch64"}
+
+if [ ! -e Makefile.inc1 ]; then
+ echo "Makefile.inc1 missing, please run inside a fresh FreeBSD source checkout as /usr/src"
+ exit 1
+fi
+
+mkdir -p $MAKEOBJDIRPREFIX
+ncpu=$(sysctl -n hw.ncpu 2>/dev/null || nproc 2>/dev/null || echo 1)
+
+if ! env PATH=$HOMEBREW_PATH /usr/bin/which clang clang++ clang-cpp ld.lld python3 >/dev/null; then
+ echo "missing programs: clang, lld, or phython3"
+ exit 1
+fi
+
+export CPP="clang-cpp"
+export CC="clang"
+export CXX="clang++"
+export XCPP="clang-cpp"
+export XCC="clang"
+export XCXX="clang++"
+export XLD="/opt/homebrew/bin/ld.lld"
+
+# keep logs from previous run
+gzip -f macos.setup macos.buildworld macos.buildkernel 2>/dev/null || true
+
+# log infos about MacOS setup
+(
+sysctl machdep.cpu.brand_string
+sysctl kern.osproductversion
+echo "$(sysctl hw.physicalcpu) / P-cores: $(sysctl hw.perflevel0.physicalcpu) / E-cores: $(sysctl hw.perflevel1.physicalcpu)"
+sysctl hw.memsize | awk '{ printf("%s %2.1f GB\n", $1, $2/1024/1024/1024) }'
+
+echo "Xcode path: $(xcode-select -p)"
+echo "Xcode version: $(pkgutil --pkg-info=com.apple.pkg.CLTools_Executables | grep '^version: ')"
+
+if [ -d $clt_sdk_dir ]; then
+ echo "SDK version: $(ls -l $clt_sdk_dir)"
+fi
+
+if [ -d .git ]; then
+ echo "local git branch: $(git branch | grep '^\*')"
+fi
+
+echo ""
+echo PATH=$PATH
+
+echo "clang path: $(which clang)"
+clang --version
+
+echo "linker path: $(which ld.lld)"
+ld.lld -v 2>&1
+
+echo ""
+echo "TARGET=$TARGET TARGET_ARCH=$TARGET_ARCH"
+echo "CC=$CC CXX=$CXX CPP=$CPP"
+echo "XCC=$XCC CXX=$XCXX CPP=$XCPP XLD=$XLD"
+
+echo ""
+echo "current MAKEOBJDIRPREFIX disk usage: $(du -hs $MAKEOBJDIRPREFIX)"
+echo ""
+echo "run now buildworld and buildkernel for ${TARGET}/${TARGET_ARCH} ..."
+echo ""
+) > macos.setup
+
+#
+# build FreeBSD world and kernel
+#
+# expected runtime for
+# MacBook Air (M1, 2020, 4P/4E cores) ca. 70min
+# MacBook Pro (M1, 2021, 8P/2E cores) ca. 37min
+#
+if $nice_cmd ./tools/build/make.py -j$ncpu TARGET=$TARGET TARGET_ARCH=$TARGET_ARCH buildworld > macos.buildworld 2>&1 && \
+ $nice_cmd ./tools/build/make.py -j$ncpu TARGET=$TARGET TARGET_ARCH=$TARGET_ARCH buildkernel > macos.buildkernel 2>&1
+then
+ (
+ echo "MAKEOBJDIRPREFIX disk usage:"
+ du -hs $MAKEOBJDIRPREFIX ${MAKEOBJDIRPREFIX}${PWD}
+ echo ""
+ echo ">>> Build of buildworld and buildkernel were successfully executed <<<"
+ ) >> macos.setup
+else
+ echo "Build failed. Please look at the logfiles"
+ ls -lt macos.*
+ exit 1
+fi
+
+#EOF

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