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# Check whether the etext segment is usable
#
# SPDX-FileCopyrightText: Copyright 2023 Markus Uhlin
# SPDX-License-Identifier: BSD-3-Clause
check_etext () {
local _tmpfile _srcfile _out
local _val=1
printf "creating temp file..."
_tmpfile=$(mktemp) || { echo "error"; exit 1; }
echo "ok"
_srcfile="${_tmpfile}.c"
_out="${_tmpfile}.out"
cat <<EOF >"$_srcfile"
#include <stddef.h>
int global;
static int
valid(const void *ptr)
{
extern char etext;
return (ptr != NULL && ((const char *) ptr) > &etext);
}
int
main(void)
{
int local;
if (valid(&local) && valid(&global))
return 99;
return 1;
}
EOF
if [ ! -f "$_srcfile" ]; then
echo "failed to create $_srcfile"
exit 1
fi
printf "checking whether the etext segment is usable..."
${CC} ${CFLAGS} -Werror "$_srcfile" -o "$_out" ${LDFLAGS} \
>/dev/null 2>&1
if [ $? -eq 0 ]; then
eval "$_out"
_val=$?
fi
if [ ${_val} -eq 99 ]; then
echo "yes"
cat <<EOF >>$MAKE_DEF_FILE
CPPFLAGS += -DHAVE_ETEXT_SEGMENT=1
EOF
else
echo "no"
fi
echo "cleaning..."
test -f "$_tmpfile" && rm -f "$_tmpfile"
test -f "$_srcfile" && rm -f "$_srcfile"
test -f "$_out" && rm -f "$_out"
}
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