tpdualscan.c (also known as tpdscan.c) was originally written by Michael Steiner in the 90s. I've committed it to this repository so it can be found using Google.

As written by Debian developer Ben Hutchings in 2015: "gcc for i386 has recently been changed to target 686-class processors and is generating code that will crash on other processors". LLVM is also not supporting i486, since it assumes at least the (original) Pentium. Although this might change in the future. Using an older gcc release is the only feasable option at the moment.

Compiling an old gcc using a new version of gcc does not seem to be a good idea.That's why I tried using an old Ubuntu release which had the old version still packaged.

Open an Ubuntu 12.04 ISO and run the virtual machine. Replace the apt subdomain in sources.list with old-releases and install gcc and gcc-multiplib. Note that the gcc multilib version and gcc needs to be equal.

• https://groups.csail.mit.edu/mac/ftpdir/thinkpad/old-archive/HTML/tp-1995/msg01241.html
• https://www.thinkwiki.org/wiki/WD90C24
• https://www.linuxjournal.com/article/3429

It is needed to apply some patches to gcc 4.8.2 so it can be built using gcc 9.3.0... 🙃

git clone https://github.com/eloydegen/tpdualscan
cd tpdualscan
sudo apt install build-essential
https://ftp.gnu.org/gnu/gcc/gcc-4.8.2/gcc-4.8.2.tar.bz2
tar xvf gcc-4.8.2.tar.bz
cd gcc-4.8.2
./contrib/download_prerequisites
./configure
wget https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff_plain;h=ec1cc0263f156f70693a62cf17b254a0029f4852 build.patch
patch -p1 < build.patch 
wget https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=883312dc79806f513275b72502231c751c14ff72 build2.patch
patch -p1 < build2.patch 
make
./bin/gcc -march=i486 ./tpdualscan.c -o tpdualscan

Also apply these patches:

• google/sanitizers#822 (comment)
• https://patchwork.ozlabs.org/project/gcc/patch/6824253.3U2boEivI2@devpool21/
• https://stackoverflow.com/a/48647715