Re: Rust 1.19 fails to build on i686 on ‘staging’

[Chris Marusich <cmmarusich@gmail.com>]

[-- Attachment #1.1: Type: text/plain, Size: 1058 bytes --]

Hi Danny,

Danny Milosavljevic <dannym@scratchpost.org> writes:

> Can you try the following (if you didn't already)?
>
> [...]
>
> (i.e. the things you did before, just inside a i686-linux guix
> environment.  That only provides minimal--almost no--isolation from
> the host, so it should allow us to test whether the personality is the
> only possible culprit)

Did you mean to say that by using a pure guix environment, we can
achieve a high degree of isolation?

I tried what you suggested.  The mrustc invocation still succeeded.

Just for fun, I also made a simple wrapper program that lets me run
another program using the LINUX32 personality (see attached).  I think I
programmed it correctly, but C is not (yet!) my forte, so if I made an
error, please let me know.  From within the same pure environment, I
used this wrapper program to invoke mrustc in the same way, and it
_still_ succeeded.  That surprised me, since I expected it to fail.

Can you think of any other way I can try to reproduce the issue?

-- 
Chris

[-- Attachment #1.2: with_linux32_personality.c --]
[-- Type: application/octet-stream, Size: 1016 bytes --]

#include <sys/personality.h>
#include <stdio.h>
#include <unistd.h>

int main (int argc, char *argv[]) {
  // Allow at most 100 arguments.
  const int ARGS_SIZE = 102;
  // The first element of args is reserved for the target program
  // name, and the last element is reserved for the NULL pointer.
  char *args[ARGS_SIZE];
  if (argc > ARGS_SIZE) {
    // We can't fit everything into into args.
    printf("Specify 1 program name and at most %d arguments\n", ARGS_SIZE - 2);
    return 2;
  }
  printf("argc: %d\n", argc);
  printf("argv[0]: %s\n", argv[0]);
  char *target_program = argv[1];
  if (NULL == target_program) {
    puts("Specify a program to run");
    return 2;
  }
  for (int i = 0; i < ARGS_SIZE; i++) {
    args[i] = argv[i + 1];
    printf("args[%d]: %s\n", i, args[i]);
    if (NULL == args[i]) {
      break;
    }
  }
  if (personality(PER_LINUX32) == -1) {
    perror("failed to set personality");
    return 1;
  }
  puts("\n--- Executing program ---\n");
  execv(target_program, args);
}

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]