b3view/debug-and-show-tb.sh

#!/bin/bash
# ^ bash for if syntax and to avoid "Bad fd number" on using $?
# echo "run" > gdb.batch.txt
# echo "bt" >> gdb.batch.txt
MY_EXE=build/b3view
# gdb "$MY_EXE" --command=gdb.batch.txt --batch
echo
ERR_TXT=err.txt
if [ -f "$ERR_TXT" ]; then
    rm "$ERR_TXT"
    if [ $? -ne 0 ]; then
        echo "Error: removing the old \"$ERR_TXT\" failed."
        exit 1
    fi
fi
# echo "* Output will not appear here. Check \"$ERR_TXT\" (It will be shown below when the program ends)..."
# gdb "$MY_EXE" --eval-command=run --eval-command=bt --batch  >& "$ERR_TXT"
gdb "$MY_EXE" --eval-command=run --eval-command=bt --batch  |& tee "$ERR_TXT"
# or pipe only stderr: {tmp}>&1 1>&2 2>&$tmp {tmp}>&- | tee "$ERR_TXT"
# as per https://stackoverflow.com/a/52575213/4541104
code=$?
if [ $code -ne 0 ]; then
    # echo "'gdb \"$MY_EXE\" --eval-command=run --eval-command=bt --batch  >& \"$ERR_TXT\"' failed (status=$code)."
    echo "'gdb \"$MY_EXE\" --eval-command=run --eval-command=bt --batch  |& tee \"$ERR_TXT\"' failed (status=$code)."
else
    echo "The program closed (status=$code)."
fi
# cat "$ERR_TXT"