Re: Define __start/__stop symbols when there is only a dynamic def

[Michael Matz <matz at suse dot de>]

Hi,

On Mon, 29 Jan 2018, H.J. Lu wrote:

> We need a run-time testcase.  Can you provide a run-time testcase?

Replace app.c from last mail with this, add -ldl as appropriate.  Only 
works on systems that have RTLD_DEFAULT (RTLD_SELF could also be used, but 
those are are subset of the former).

% cat app.c
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <dlfcn.h>

extern int __start___verbose[];
extern int __stop___verbose[];
int bar (void)
{
  static int my_var __attribute__((section("__verbose"))) = 6;
  int *ptr;
  ptr = (int*) dlsym(RTLD_DEFAULT, "__start___verbose");
  if (!ptr || *ptr != 6)
    return -1;
  return 0;
}

int main()
{
  if (bar () != 0)
    {
      printf("main: wrong __start___verbose\n");
      exit(2);
    }
  return 0;
}


Ciao,
Michael.