j1939acd: fix uclibc compile (const char* program_invocation_name)

[pseiderer]

• disable command line option '-p' in case of uclibc

Fixes:

  j1939acd.c: In function 'main': j1939acd.c:489:38: error: passing argument 1 of 'asprintf' from incompatible pointer type [-Wincompatible-pointer-types]
    489 |                         if (asprintf(&program_invocation_name, "%s.%s",
        |                                      ^~~~~~~~~~~~~~~~~~~~~~~~
        |                                      |
        |                                      const char **

[olerem]

It would be better to actually replace this function. But this patch just extending existing exception. So, I'm ok with it. @marckleinebudde , haw about you?

[marckleinebudde]

What about removing the -P to set the program_invocation_name functionality from all programs?

[olerem]

Hm, I have nothing against it.

[pseiderer]

Fine with me too ;-), specially as the following test program

define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <err.h>

int main(int argc, char* argv[]) {
        program_invocation_name = program_invocation_short_name;
        asprintf(&program_invocation_name, "bla");
        asprintf(&program_invocation_short_name, "blub");
        warn("warn-test");
        err(1, "err-test");
        return 0;
}

produces the following output:

blub: warn-test: Success
blub: err-test: Success

Seems asprintf of j1939acd.c overwrites the wrong variable (at least for my local system)...

Will provide an alternative pull-request removing the program_invocation_name overwrite funcionality...

[olerem]

Close it in favor of #552