nixpkgs/pkgs/build-support/setup-hooks/win-dll-link.sh

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fixupOutputHooks+=(_linkDLLs)
# For every *.{exe,dll} in $output/bin/ we try to find all (potential)
# transitive dependencies and symlink those DLLs into $output/bin
# so they are found on invocation.
# (DLLs are first searched in the directory of the running exe file.)
# The links are relative, so relocating whole /nix/store won't break them.
_linkDLLs() {
(
if [ ! -d "$prefix/bin" ]; then exit; fi
cd "$prefix/bin"
# Compose path list where DLLs should be located:
# prefix $PATH by currently-built outputs
local DLLPATH=""
local outName
for outName in $outputs; do
addToSearchPath DLLPATH "${!outName}/bin"
done
DLLPATH="$DLLPATH:$PATH"
echo DLLPATH="'$DLLPATH'"
linkCount=0
# Iterate over any DLL that we depend on.
local dll
for dll in $(objdump -p *.{exe,dll} | sed -n 's/.*DLL Name: \(.*\)/\1/p' | sort -u); do
if [ -e "./$dll" ]; then continue; fi
# Locate the DLL - it should be an *executable* file on $DLLPATH.
local dllPath="$(PATH="$DLLPATH" type -P "$dll")"
if [ -z "$dllPath" ]; then continue; fi
# That DLL might have its own (transitive) dependencies,
# so add also all DLLs from its directory to be sure.
local dllPath2
for dllPath2 in "$dllPath" "$(dirname "$dllPath")"/*.dll; do
if [ -e ./"$(basename "$dllPath2")" ]; then continue; fi
ln -sr "$dllPath2" .
linkCount=$(($linkCount+1))
done
done
echo "Created $linkCount DLL link(s) in $prefix/bin"
)
}