#!/bin/bash

# Copyright (c) 2017-2019 Red Hat.
#
# This is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 3, or (at your
# option) any later version.
#
# It is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

rm -f hello.o hello2.o function-sections-test.exe unused_code.o unused_code.i unused_code.s fred.map

GCC=${GCC:-gcc}
READELF=${READELF:-readelf}
ANNOCHECK=${ANNOCHECK:-../annocheck/annocheck}
PLUGIN=${PLUGIN:-../gcc-plugin/.libs/annobin.so}

PLUGIN_OPTS="-fplugin-arg-annobin-no-attach"
OPTS="-Wformat -Werror=format-security -Wall -c -O2 -D_FORTIFY_SOURCE=2 -fPIE -fstack-protector-strong -D_GLIBCXX_ASSERTIONS -fstack-clash-protection"
EXTRA_OPTS="-fcf-protection -mstackrealign"

$GCC -fplugin=$PLUGIN $PLUGIN_OPTS -g $OPTS $EXTRA_OPTS  $srcdir/hello_hard.c 
if [ $? != 0 ];
then
    echo "Compiler might not support -fcf-protection, retrying without it"
    EXTRA_OPTS="-mstackrealign"
    $GCC -fplugin=$PLUGIN $PLUGIN_OPTS -g $OPTS  $EXTRA_OPTS $srcdir/hello_hard.c 
    if [ $? != 0 ];
    then
	echo "Compiler might not support -mstackrealign, retrying without it"
	EXTRA_OPTS="-fcf-protection"
	$GCC -fplugin=$PLUGIN $PLUGIN_OPTS -g $OPTS $EXTRA_OPTS $srcdir/hello_hard.c 
	if [ $? != 0 ];
	then
	    echo "Compiler might not support either -fcf-protection or -mstackrealign, retrying without both"
	    EXTRA_OPTS=""
	    $GCC -fplugin=$PLUGIN $PLUGIN_OPTS -g $OPTS $EXTRA_OPTS $srcdir/hello_hard.c 
	    if [ $? != 0 ];
	    then
		echo "Failed :-("
		exit 1
	    fi
	fi
    fi
fi


$GCC -fplugin=$PLUGIN $PLUGIN_OPTS $OPTS $EXTRA_OPTS -ffunction-sections $srcdir/unused_code.c \

$GCC -fplugin=$PLUGIN $PLUGIN_OPTS $OPTS $EXTRA_OPTS $srcdir/hello.c 

$GCC -fplugin=$PLUGIN $PLUGIN_OPTS $OPTS $EXTRA_OPTS -ffunction-sections $srcdir/hello2.c 

# For extra debugging add these to linker command line below:
#     -Wl,--print-gc-sections \
#     -Wl,--orphan-handling=warn \

$GCC -pie \
     -Wl,-z,now,-z,relro \
     -Wl,--gc-sections \
     -Wl,-Map,fred.map \
 hello.o unused_code.o hello2.o -o function-sections-test.exe

# FIXME - we should check that the notes were parsed correctly...
# FIXME - we should check for gaps.
$ANNOCHECK -v --ignore-gaps --skip-entry function-sections-test.exe