Recursively copy windows binary (dll/exe) dependencies from a sysroot (mingw toolchain) to the binaries directory.

mingw-copy-deps.sh

#!/usr/bin/env bash
#
# Copyright: © 2015 Jeffrey Clark <https://github.com/h0tw1r3/>
# License: GPLv3 (http://www.gnu.org/licenses/gpl-3.0.html)
#
set -o errtrace

error() {
        echo "ERROR in $0 : line $1 exit code $2"
        exit $2
}
trap 'error ${LINENO} ${?}' ERR

if [[ -z $1 || ! -d $1 || ! -f $2 ]]
then
        echo "Usage: $(basename $0) SYSROOT BINARY"
        echo "Search SYSROOT for BINARY dependencies and copy to dirname(BINARY)"
        exit 1
fi

SYSROOT=$1
COPYTO=$(dirname $2)

if [[ ! -w ${COPYTO} ]]
then
        echo "Error: ${COPYTO} is not writable"
        exit 1
fi

function copydeps
{
        depfilename=$(basename "${1}")
        strings "${1}" | busybox awk '{temp=tolower($0)} temp ~ /^([^\ ])*\.dll$/ && !/^'${depfilename,,}'$/ { print $0 }' | while read dll
        do
                destname=${COPYTO}/$(basename "${dll}")
                [ -f "${destname}" ] && continue

                find "${SYSROOT}" -name "${dll}" | while read f
                do
                        cp -v "${f}" "${destname}" && copydeps "${f}" && break
                done
        done
}

copydeps "${2}"

Switched to busy box for Awk due to errors after gawk 5.0 update. This is due to the following error:

awk: cmd. line:1: warning: regexp escape sequence `\ ' is not a known regexp operator

Using busybox is easier than trying to downgrade gawk. This is likely not needed as the error did not stop the dll's from being copied, but it does repress the error.