Install tradcpp with Homebrew, MacPorts, Nix

Project links

• Homepage

Commands and aliases

• tradcpp

Project history

The official tradcpp page says the tool was written for historical uses of the C preprocessor on non-C input, because modern compiler-bundled preprocessors increasingly do not provide a traditional mode or preserve the behavior old build systems expect. The project deliberately keeps a narrow scope and does not try to become a full modern C89/C99/C11 preprocessor.

A distinctive implementation goal is whitespace preservation. The author calls out makefiles, old Emacs build logic, and imake as examples where rearranging whitespace can break legacy systems. tradcpp also includes a trace mode for diagnosing complex preprocessor use; the page says it was written to investigate an imake problem on Solaris.

Adoption history

The most explicit adoption history is in pkgsrc: the official page says pkgsrc, the NetBSD package system, has used tradcpp for these purposes since 2013. That makes tradcpp a package-system support tool rather than a broad end-user application.

How it is used

In package-manager culture, tradcpp is used when a build recipe needs a traditional cpp that preserves old preprocessing behavior for files such as makefiles. Users are explicitly steered away from using it for normal modern C code.

Why package nerds care

tradcpp matters to package nerds because it is infrastructure for keeping old source packages buildable. It represents the unglamorous compatibility layer a portability framework like pkgsrc sometimes needs when upstream build systems rely on historical Unix behavior.

Timeline

• 2013: pkgsrc begins using tradcpp for legacy preprocessing use cases.
• Current official release: tradcpp 0.5.3 is listed on the NetBSD-hosted project page.

Related projects

• pkgsrc uses tradcpp for package builds with legacy preprocessing needs.
• imake and old Emacs build systems are named by the author as examples of the historical cpp usage tradcpp was designed to support.

Sources

• https://www.netbsd.org/~dholland/tradcpp - official project page describing purpose, pkgsrc use since 2013, trace mode, release, and Mercurial repository.