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unexelf.c doesn't always work on Solaris
From: |
Drazen Kacar |
Subject: |
unexelf.c doesn't always work on Solaris |
Date: |
Wed, 21 Aug 2002 02:54:58 +0200 |
Hi,
I've compiled Emacs 21.2 with gcc 3.2 on Solaris 8 and specified
LDFLAGS="-Wl,-zcombreloc". That's a linker flag which asks for some
optimizations, so the start-up will be faster.
With that in place, "emacs -batch" works, but starting Emacs without that
option ends in SIGSEGV. The problem is that the stuff in unexelf.c
doesn't know how to handle a single combined relocation section.
I could try to make it work, but the code is messy and I rather wouldn't.
A simple and elegant solution is to use Solaris dldump() function, like
this:
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int
unexec (char *new_name, char *old_name, unsigned int data_start,
unsigned int bss_start, unsigned int entry_address)
{
if (dldump (0, new_name, RTLD_MEMORY))
{
fprintf (stderr, "unexec(): dldump(%s): %s\n", new_name, dlerror());
exit(1);
}
return 0;
}
With that in place everything works perfectly. You just need to add a
configure check for dldump() (it can be accessed on Solaris by linking in
libdl).
--
.-. .-. I don't work here. I'm a consultant.
(_ \ / _)
| dave@willfork.com
|
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