Editing IBM System/370 (section)

==GCC and Linux on the S/370==
The [[GNU Compiler Collection]] (GCC) had a [[compiler back-end|back end]] for S/370, but it became obsolete over time and was finally replaced with the S/390 backend. Although the S/370 and S/390 instruction sets are essentially the same (and have been consistent since the introduction of the S/360), GCC operability on older systems has been abandoned.<ref>{{cite web|url=https://gcc.gnu.org/gcc-3.4/changes.html#obsolete_systems|title=Removed architectures and systems removed from GCC 3.4}}</ref> GCC currently works on machines that have the full instruction set of System/390 Generation 5 (G5), the hardware platform for the initial release of [[Linux on IBM Z|Linux/390]]. However, a separately maintained version of GCC 3.2.3 that works for the S/370 is available, known as GCCMVS.<ref>{{cite web|url=http://gccmvs.sourceforge.net|title=GCCMVS (GCC 3.2.3 for S/370)}}</ref>