nixpkgs/pkgs/build-support/setup-hooks/fix-darwin-dylib-names.sh

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# On macOS, binaries refer to dynamic library dependencies using
# either relative paths (e.g. "libicudata.dylib", searched relative to
# $DYLD_LIBRARY_PATH) or absolute paths
# (e.g. "/nix/store/.../lib/libicudata.dylib"). In Nix, the latter is
# preferred since it allows programs to just work. When linking
# against a library (e.g. "-licudata"), the linker uses the install
# name embedded in the dylib (which can be shown using "otool -D").
# Most packages create dylibs with absolute install names, but some do
# not. This setup hook fixes dylibs by setting their install names to
# their absolute path (using "install_name_tool -id"). It also
# rewrites references in other dylibs to absolute paths.
fixupOutputHooks+=('fixDarwinDylibNamesIn $prefix')
fixDarwinDylibNames() {
local flags=()
local old_id
for fn in "$@"; do
flags+=(-change "$(basename "$fn")" "$fn")
done
for fn in "$@"; do
if [ -L "$fn" ]; then continue; fi
echo "$fn: fixing dylib"
install_name_tool -id "$fn" "${flags[@]}" "$fn"
done
}
fixDarwinDylibNamesIn() {
local dir="$1"
fixDarwinDylibNames $(find "$dir" -name "*.dylib")
}