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

From: Petr Hracek <[email-masked]>
Date: Fri, 2 Oct 2015 14:58:56 +0200

On 10/02/2015 10:49 AM, Eli Zaretskii wrote:
>> Cc: [email-masked]
>> From: Petr Hracek <[email-masked]>
>> 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: [email-masked]