[TUHS] LSX on the PDP-11/03 (LSI-11)

Warner Losh imp at bsdimp.com
Mon Jun 1 03:43:46 AEST 2020

On Sun, May 31, 2020 at 6:34 AM <ron at ronnatalie.com> wrote:

> > Anyway, I've tried compiling Hello World on LSX, and I get "1: External
> > definition syntax" error. Some help would be nice, but more generally, is
> > anyone on this list more than vaguely familiar with LSX, or 6th Edition
> > itself?
> >
> > void main () {
> >         printf("Hello World!");
> > }
> >
> > It seems that the 7th Edition was the beginning of the standard library
> in
> > C, and that this is missing in LSX. I'm not sure if printf is an
> intrinsic
> > function in (6th Edition) C, or if it's from a library.
> >
> First off, VOID MAIN is not legal in any standard version of C.  Even when
> the language allows implementation defined extensions to the main
> signature, it must still return int.
> If you have a later version of language supported, you have to define
> printf rather than allowing it default define as an int returning
> function.
> Add #include <stdio.h>

Or, alternatively, LSX is really old. The compiler there likely doesn't
support 'void'.

>From the lsx part of tuhs:

# cp /dev/tty8 addr.c
main() {
  int a;
  printf("main address: %u (0%o)\n", main, main);
  printf("stack address: %u (0%o)\n", &a, &a);
  printf("heap address: %u (0%o)\n", sbrk(0), sbrk(0));
# cc addr.c
# a.out
main address: 16410 (040032)
stack address: 40934 (0117746)
heap address: 17920 (043000)

None of the disks appear to have a /usr/include. The only .h files look
like they were from the kernel.

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