Whole archive is not working when we do static linking

[0xbentang]

When I run

pkg-config --libs --static <libname>

It will wrap all the static libs with -Wl,--whole-archive ... -Wl,--no-whole-archive -Wl,--export-dynamic

But when I run it with pkg-config-rs

pkg_config::Config::new()
        .statik(true)
        .print_system_libs(true)
        .probe(<libname>)?;

All the -Wl flags are grouped in the end

... -C link-arg=-Wl,--whole-archive -C link-arg=-Wl,--no-whole-archive -C link-arg=-Wl,--export-dynamic -C link-arg=-Wl,--as-needed

It has been causing some runtime errors due to missing objects. Just curious if this is the expected behaviour, or is it I'm not using the crate correctly? Thanks in advance