Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.
Bug 5031 - nm --size-sort can report bogus sizes on .o files.
Summary: nm --size-sort can report bogus sizes on .o files.
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: binutils
Version: 6.0
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Cristian Gafton
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 1999-09-09 19:53 UTC by Nalin Dahyabhai
Modified: 2008-05-01 15:37 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2000-02-04 17:39:36 UTC

Attachments (Terms of Use)

Description Jim Kingdon 1999-09-09 19:53:45 UTC
(reported by Bill Nottingham).

This is a bug whereby nm --size-sort will sometimes
think that a symbol extends to the end of the current
section, when it really is smaller than that.
Enclosed is a test case and a fix.

[kingdon@porky tmp]$ cat hello.c
int y = 50;

static int bar (void) { printf ("hello, world\n"); return 0;

main (int argc, char **argv)
  return bar ();
[kingdon@porky tmp]$ gcc -c -o hello.o hello.c
[kingdon@porky tmp]$ nm --size-sort hello.o
00000004 D y
00000010 T main
00000028 t bar
[kingdon@porky tmp]$ nm-new --size-sort hello.o
00000004 D y
00000010 T main
00000018 t bar
[kingdon@porky tmp]$

1999-09-09  Jim Kingdon  <>

        * nm.c (size_forward1): Only sort by address if the
symbols are in
        the same section.

--- nm.c~       Sat Feb 20 19:56:56 1999
+++ nm.c        Thu Sep  9 15:33:12 1999
@@ -726,11 +726,19 @@
   if (bfd_is_und_section (ys))
     abort ();

-  if (valueof (x) != valueof (y))
-    return valueof (x) < valueof (y) ? -1 : 1;
   if (xs->vma != ys->vma)
     return xs->vma < ys->vma ? -1 : 1;
+  /* We want to sort by address (or symbol name or
whatever) only
+     within a given section (e.g. in .o files several
sections will be
+     mapped to address zero and we want all the symbols in
one section
+     to be together when we go to compute sizes).  */
+  if (xs != ys)
+    return strcmp (bfd_section_name (sort_bfd, xs),
+                  bfd_section_name (sort_bfd, ys));
+  if (valueof (x) != valueof (y))
+    return valueof (x) < valueof (y) ? -1 : 1;

   xn = bfd_asymbol_name (x);
   yn = bfd_asymbol_name (y);

Comment 1 Jim Kingdon 1999-09-10 15:24:59 UTC
Submitted to binutils maintainers at

This isn't important enough to need a new RPM before it makes it
into a binutils release.

Comment 2 Cristian Gafton 2000-02-04 17:39:59 UTC
Fixed in the current devel tree (patch applied, I have no idea why the binutils
dudes have not integrate it yet)

Note You need to log in before you can comment on or make changes to this bug.