Re: gdb very slow during 'step into'

[Jim Blandy <jimb@codesourcery.com>]

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"dodji Seketeli" <dodji@seketeli.org> writes:
>> If you set the environment variable LD_BIND_NOW to a non-empty value
>> before running your program (use GDB's 'set env' command), does that
>> eliminate the slow steps?
>
> Wow, yes. It does eliminate the problem. Thank you !.

I'm glad that helped!  But setting LD_BIND_NOW is just a workaround;
GDB ought to work properly without that.  Could you apply the
following patch to GDB and see if it makes the problem go away, even
with LD_BIND_NOW left unset?

(Tested without regressions on Fedora Core 6 IA-32.  I haven't been
able to reproduce the problem myself, so I'm just guessing that this
is the patch.)


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gdb/ChangeLog:
2007-01-03  Jim Blandy  <jimb@codesourcery.com>

	* glibc-tdep.c (glibc_skip_solib_resolver): Look for '_dl_fixup',
	then plain 'fixup'.

Index: gdb/glibc-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/glibc-tdep.c,v
retrieving revision 1.3
diff -u -r1.3 glibc-tdep.c
--- gdb/glibc-tdep.c	17 Dec 2005 22:34:00 -0000	1.3
+++ gdb/glibc-tdep.c	3 Jan 2007 19:49:17 -0000
@@ -90,8 +90,14 @@
 
   if (resolver)
     {
+      /* This is the name used in the dynamic linker at the beginning
+         of 2007.  */
       struct minimal_symbol *fixup
-	= lookup_minimal_symbol ("fixup", NULL, objfile);
+	= lookup_minimal_symbol ("_dl_fixup", NULL, objfile);
+      
+      /* This is the name used in older versions.  */
+      if (! fixup)
+        fixup = lookup_minimal_symbol ("fixup", NULL, objfile);
 
       if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
 	return frame_pc_unwind (get_current_frame ());