This is a port of the GCC compiler suite to IBM MVS, a predecessor of modern z/OS.

It has been repackaged here for easier collaboration. The original source can be found here.

In theory this package should also support CMS and VSE.

My original intent was to investigate symbol mangling to enable the MVS community to build larger pieces of open-source software.

One possible example might be SQLite or something like Lua. Both of them are small enough for MVS. The main problem is that symbols conflict.

I have no fixed plans on whether to proceed with this. Use at your own peril. Contributions are welcome though.

Currently only the initial cross-compile stage can be built.

On most UNIX environments all you need to do is 'make'. At the moment this will build cross-compilers for MVS, CMS and VSE. Read the makefile for other options.

My new make-based build system does not support building a C library yet. You would normally use something called PDPCLIB for that.