#!/bin/sh
set -eu

LIB=${WAYLAND_EGL_LIB}

if [ ! -f "$LIB" ]; then
	echo "The test binary \"$LIB\" does no exist"
	exit 1
fi

AVAIL_FUNCS="$($NM -D --format=bsd --defined-only $LIB | awk '{print $3}')"

# Platform specific symbols.
PLAT_FUNCS="__bss_start
_edata
_end
_fini
_init
"

# Official ABI, taken from the header.
REQ_FUNCS="wl_egl_window_resize
wl_egl_window_create
wl_egl_window_destroy
wl_egl_window_get_attached_size
"

NEW_ABI=$(echo "$AVAIL_FUNCS" | while read func; do
    echo "$REQ_FUNCS" | grep -q "^$func$" && continue
    echo "$PLAT_FUNCS" | grep -q "^$func$" && continue

    echo $func
done)

test ! -n "$NEW_ABI" || echo "New ABI detected - If intentional, update the test."; echo "$NEW_ABI"

REMOVED_ABI=$(echo "$REQ_FUNCS" | while read func; do
    echo "$AVAIL_FUNCS" | grep -q "^$func$" && continue

    echo $func
done)

test ! -n "$REMOVED_ABI" || echo "ABI break detected - Required symbol(s) no longer exported!"; echo "$REMOVED_ABI"
test ! -n "$NEW_ABI" || test ! -n "$REMOVED_ABI"