public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "baker at usgs dot gov" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/54584] m68k-uclinux error: Link tests are not allowed after GCC_NO_EXECUTABLES
Date: Sat, 15 Sep 2012 00:39:00 -0000	[thread overview]
Message-ID: <bug-54584-4-ItLfpIAOYy@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54584-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54584

--- Comment #1 from Larry Baker <baker at usgs dot gov> 2012-09-15 00:39:14 UTC ---
I found that the -msep-data link would succeed if program section
.tm_clone_table has a non-zero length.

I changed __JCR_LIST__[] and __TMC_LIST__[] to __JCR_LIST__[1] and
__TMC_LIST__[1], respectively, in
gcc-4.7-20120908/libgcc/crtstuff.c.

The program sections in the original crtbegin.o have 0 length for program
section .tm_clone_table:

# freescale-coldfire-2011.09/bin/m68k-uclinux-objdump -h
cross-gcc-4.7-20120908/gcc/msep-data/crtbegin.o

cross-gcc-4.7-20120908/gcc/msep-data/crtbegin.o:     file format elf32-m68k

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000136  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000004  00000000  00000000  0000016c  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          0000001e  00000000  00000000  00000170  2**2
                  ALLOC
  3 .ctors        00000004  00000000  00000000  00000170  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  4 .dtors        00000004  00000000  00000000  00000174  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  5 .eh_frame     00000000  00000000  00000000  00000178  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  6 .jcr          00000000  00000000  00000000  00000178  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  7 .tm_clone_table 00000000  00000000  00000000  00000178  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  8 .fini         00000006  00000000  00000000  00000178  2**0
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  9 .init         00000006  00000000  00000000  0000017e  2**0
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
 10 .comment      00000028  00000000  00000000  00000184  2**0
                  CONTENTS, READONLY
 11 .note.GNU-stack 00000000  00000000  00000000  000001ac  2**0
                  CONTENTS, READONLY

The new one has length 4:

# freescale-coldfire-2011.09/bin/m68k-uclinux-objdump -h
cross-gcc-4.7-20120908/gcc/msep-data/crtbegin.o

cross-gcc-4.7-20120908/gcc/msep-data/crtbegin.o:     file format elf32-m68k

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000136  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000004  00000000  00000000  0000016c  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          0000001e  00000000  00000000  00000170  2**2
                  ALLOC
  3 .ctors        00000004  00000000  00000000  00000170  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  4 .dtors        00000004  00000000  00000000  00000174  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  5 .eh_frame     00000000  00000000  00000000  00000178  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  6 .jcr          00000004  00000000  00000000  00000178  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  7 .tm_clone_table 00000004  00000000  00000000  0000017c  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  8 .fini         00000006  00000000  00000000  00000180  2**0
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  9 .init         00000006  00000000  00000000  00000186  2**0
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
 10 .comment      00000028  00000000  00000000  0000018c  2**0
                  CONTENTS, READONLY
 11 .note.GNU-stack 00000000  00000000  00000000  000001b4  2**0
                  CONTENTS, READONLY

I do not know if this results in a correctly allocated or populated
.tm_clone_table.  All I know is that the zero length allocation caused the link
failure.  Is this due to the ALLOC attribute with 0 length?  Is this a
consequence of __attribute__((used))?


  reply	other threads:[~2012-09-15  0:39 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-14 20:44 [Bug target/54584] New: " baker at usgs dot gov
2012-09-15  0:39 ` baker at usgs dot gov [this message]
2012-09-18  2:45 ` [Bug target/54584] " baker at usgs dot gov
2012-09-18 21:43 ` baker at usgs dot gov
2012-09-18 21:53 ` baker at usgs dot gov
2012-09-18 23:30 ` hp at gcc dot gnu.org
2012-09-19  0:05 ` baker at usgs dot gov
2012-09-19  0:15 ` baker at usgs dot gov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=bug-54584-4-ItLfpIAOYy@http.gcc.gnu.org/bugzilla/ \
    --to=gcc-bugzilla@gcc.gnu.org \
    --cc=gcc-bugs@gcc.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).