Borland C++ 2.0 Compiler Source Reconstructed

Developer Abedegno has published a reconstructed source tree for Borland C++ 2.0, the 1991 commercial compiler, on GitHub under the project name borland-reborn, claiming it is a byte-perfect recreation in that binaries compiled with the toolchain are identical to the originals. The reconstruction used Abedegno's Claude Code-based Exhume tool to assist in recovering the source from the original toolchain binaries, a process detailed in a separate HOW-IT-WORKS document. The release is aimed at projects working with DOS-era software and at historic interest, since C had only just been standardized as C89 when BC++ 2.0 shipped and C++'s first standard did not arrive until 1998.

As the successor to Turbo C++, Borland C++ was a staple of professional IDEs for C and C++ development, starting with the initial 2.0 release in 1991. Being a commercial project the original source code for the toolchains were naturally not made available by Borland, but thanks to the efforts of Abedegno we have now got what is claimed to be a byte-perfect recreation https://github.com/abedegno/borland-reborn , in the sense that the binaries compiled using the toolchain are identical to the original toolchain. The process of creating the source from the original toolchain binaries is detailed in a separate document https://github.com/abedegno/borland-reborn/blob/main/docs/HOW-IT-WORKS.md , including the use of Abedgno ’s Claude Code-based Exhume https://github.com/abedegno/Exhume tool to assist in the effort. Having the source code for BC++ 2.0 available is probably most useful for projects that deal with DOS-based software from the same era, as well as for purely historic interest reason. When BC++ 2.0 was released, the C programming language had only just seen itself standardized in the form of C89, and C++’s initial standard in 1998 was still years away. Thanks to Stephen Walters for the tip.