![]() ![]() I plan on cross-bootstrapping Java⢠7 for i386 from OpenBSD/i386, since the original plan (IcedTea/OpenEmbedded) is badly manageable. MirOS #7 to #8 transition lost sparc (due to lack of time) and involved so many changes that the MirOS #10 sparc support was cross-compiled from MirBSD/i386 instead, including Ada this time (incidentally, this was easier than cross-compiling Perl). The i386 GNAT compiler was cross-built from GNU/Linux. ![]() I did not succeed at cross-building sparc from i386 at that time. This is somewhat valid for i386 and sparc, until MirBSD #7. Some things, like the ELF transition, were harder (we changed our compiler (newer than OpenBSDâs) and kernel first, then had an ELF capable kernel with a.out userland, then ELF userland, finally ELF kernel and bootloader with some help from OpenBSD and NetBSD again). MirBSD was brought up by native compilation from OpenBSD at first, since they did not diverge that much. Categories Apple, Archeology, Operating Systems Post navigation So if you can contribute something in the comments here or on your blogs, that would be great. It would also be interesting to extend this information with the respective compilers used. Now I would love to see is the same kind of bringup history for Linux (Minix, …), AmigaOS (SunOS 1.x, …), BeOS, Copland (Mac OS?), Windows NT (VMS? DOS?), OS/2 (DOS? AIX?), MS-DOS (CP/M?), and of course the common bringup ancestors of so many systems, BSD and UNIX. Today, Mac OS X for Intel is self-hosting again. So, to summarize, BSD/VAX was used to develop Mach/VAX, and SunOS/M68K was used to port Mach to 68K, Nextstep/68K was used to port itself to i386, and the i386 version to port itself to PowerPC, and then the PowerPC version to maintain the i386 version. Now that we arrived at BSD, we could go back the history of UNIX, which I am not going to do at this point. Coincidently, 4.2BSD evolved into SunOS 1.0 (and 4.2BSD/VAX machines were used for its bringup), and the BSD codebase also ended up in Nextstep. Mach 1.0 was first written for VAX and was brought up on VAX-based 4.2BSD machines at Carnegie-Mellon University. So this port was not only cross-architecture, but cross-OS. The NEXT engineers ported the Mach 2.0 kernel from VAX to M68K. Bringup was done on a 0 NeXTstation running NextStep 2.1, and the target CPU was a 486DX50.Īt NEXT, the systems used for bringup of the original 68030 NeXT Computer were Sun machines running SunOS 3.0, a BSD-derivative. Nextstep 3.1 from 1993 was the first version of Nextstep/OpenStep to support Intel CPUs (and also PA-RISC and SPARC) next to the existing Motorola 68K support. Actually, somewhere between Rhapsody and OS X 10.0, there was a time when the GUI was not built for Intel. Rhapsody, which was basically OpenStep 5.0, also continued to run on Intel, but as mentioned before, Intel became a second-class architecture. It ran on PowerPC 604 Macintoshes (the 603 was not supported because it lacked a hardware pagetable walker) and was cross-compiled from OpenStep 4.2 running on Intel Pentium II CPUs. The first version of what would later be Mac OS X was “Rhapsody DR1” released in 1997. ![]() The first released version of Intel Mac OS X was a version of 10.4 for the Pentium 4 based “Developer Transition Kit” in 2005. In that time, Mac OS X was never self-hosting instead, it was cross-compiled on PowerPC Macs. Mac OS X existed for Intel all the time, but was not released. The Intel version had been “leading a secret double life” since 2000, i.e. But what machines and operating systems were used for cross-compilation and bringup of these systems? In order to find this out about Mac OS X, I talked to a few people working at NEXT and Apple, and people that worked on Mach and BSD.Ĭurrently, Apple only ships Intel-based machines. Mac OS X includes code from Mach and BSD, AmigaOS is based on TRIPOS, MS-DOS is a CP/M-86 clone and Windows NT is modeled after VMS. The heritage of different operating systems has been discussed many times. ![]()
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