#!/bin/sh
# DF-1297 harness build.
# -O0 is REQUIRED: at -O2 gcc sees integer div-by-zero as UB and elides the
# `div` instruction. The real kernel builds at -O2 BUT the divisor is read
# at runtime from a parsed VBIOS struct pointer (hwmgr->thermal_controller.
# advanceFanControlParameters.usTMed), so gcc cannot see it is zero and emits
# a real `div` -> #DE trap -> panic. -O0 faithfully reproduces that runtime
# division in userspace.
set -e
cd "$(dirname "$0")"
cc -O0 -Wall -o harness harness.c
echo "BUILD_EXIT=$?"
ls -l harness