bug#20614: Segmentation fault when building on Power8 Little Endian

[Petr Hracek]

On 10/02/2015 10:49 AM, Eli Zaretskii wrote:
> > Cc: 20614@debbugs.gnu.org
> > From: Petr Hracek <phracek@redhat.com>
> > Date: Fri, 2 Oct 2015 10:36:27 +0200
> >
> > What does this GDB command display in frame #1:
> >
> >    (gdb) p old_section_names + NEW_SECTION_H (nn).sh_name
> >
> > ?
> >
> > It is a really strange.
> > in our unexelf.c is NEW_SECTION_H defined as
> >
> > #define NEW_SECTION_H(n) \
> > (*(ElfW (Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
> >
> > Paul Eggert did a some patch 1 or 2 year ago and modify it to
> > #define NEW_SECTION_H(n) \
> >    (*(ElfW (Shdr) *) entry_address (new_section_h, n, new_file_h->e_shentsize))
> >
> > (gdb) frame 1
> > #1 0x00000000102e3724 in unexec (new_name=0x116387e8
> > "/home/phracek/rpmbuild/BUILD/emacs-24.3/src/emacs", old_name=0x11638838
> > "/home/phracek/rpmbuild/BUILD/emacs-24.3/src/temacs")
> > at unexelf.c:1258
> > 1258 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
> > (gdb) p old_section_names
> > $1 = 0x3fffab1dbfcc ""
> > (gdb) p old_section_names + NEW_SECTION_H (nn).sh_name
> > No symbol "NEW_SECTION_H" in current context.
> Use the expansion of that macro instead to display the value.
How to use the expansion.
Are you connected on freenode #emacs.

--
Petr Hracek
Software Engineer
Developer Experience
Red Hat, Inc
Mob: +420777056169
email: phracek@redhat.com