The Compact C Type Format (CTF) is a way of representing information about
a binary program; it can be seen as a simpler alternative to the widely
used DWARF
format. While CTF has been around for some years, it has not seen much use
in the Linux world. According to Elena Zannoni, who talked about CTF at
the 2019 Open Source Summit Japan, that situation may be about to change;
work is underway to bring CTF support to the GNU tools shipped universally
with Linux systems.

Source: LWN.net – [$] The Compact C Type Format in the GNU toolchain