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* [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section
@ 2011-03-09 9:55 mark at gcc dot gnu.org
2011-03-25 10:17 ` [Bug debug/48041] " mark at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: mark at gcc dot gnu.org @ 2011-03-09 9:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48041
Summary: dwarf2out emits unnecessary null byte in empty
.debug_abbrev section
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: mark@gcc.gnu.org
Detected by the elfutils dwarflint tool.
Example:
$ echo > empty.c
$ gcc -g -c empty.c
$ readelf -x .debug_abbrev empty.o
Hex dump of section '.debug_abbrev':
0x00000000 00 .
Although harmless it might add up if a project has a lot of objects without any
real debuginfo in them. There might not actually be many such projects though.
The fix seems easy:
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c (revision 170813)
+++ gcc/dwarf2out.c (working copy)
@@ -11058,7 +11058,8 @@
}
/* Terminate the table. */
- dw2_asm_output_data (1, 0, NULL);
+ if (abbrev_die_table_in_use > 1)
+ dw2_asm_output_data (1, 0, NULL);
}
/* Output a symbol we can use to refer to this DIE from another CU. */
Bootstraps fine on x86_64-gnu-linux and no regressions seen with make check -k
I'll submit it to gcc-patches when the tree opens up again for stage one.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug debug/48041] dwarf2out emits unnecessary null byte in empty .debug_abbrev section
2011-03-09 9:55 [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section mark at gcc dot gnu.org
@ 2011-03-25 10:17 ` mark at gcc dot gnu.org
2011-03-28 9:32 ` mark at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: mark at gcc dot gnu.org @ 2011-03-25 10:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48041
--- Comment #1 from Mark Wielaard <mark at gcc dot gnu.org> 2011-03-25 09:35:44 UTC ---
Author: mark
Date: Fri Mar 25 09:35:41 2011
New Revision: 171441
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171441
Log:
PR debug/48041
* dwarf2out.c (output_abbrev_section): Only write table when
abbrev_die_table_in_use > 1.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug debug/48041] dwarf2out emits unnecessary null byte in empty .debug_abbrev section
2011-03-09 9:55 [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section mark at gcc dot gnu.org
2011-03-25 10:17 ` [Bug debug/48041] " mark at gcc dot gnu.org
@ 2011-03-28 9:32 ` mark at gcc dot gnu.org
2011-06-29 10:22 ` ro at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: mark at gcc dot gnu.org @ 2011-03-28 9:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48041
Mark Wielaard <mark at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
AssignedTo|unassigned at gcc dot |mark at gcc dot gnu.org
|gnu.org |
--- Comment #2 from Mark Wielaard <mark at gcc dot gnu.org> 2011-03-28 09:10:09 UTC ---
Patch committed.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug debug/48041] dwarf2out emits unnecessary null byte in empty .debug_abbrev section
2011-03-09 9:55 [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section mark at gcc dot gnu.org
2011-03-25 10:17 ` [Bug debug/48041] " mark at gcc dot gnu.org
2011-03-28 9:32 ` mark at gcc dot gnu.org
@ 2011-06-29 10:22 ` ro at gcc dot gnu.org
2012-03-22 8:47 ` rguenth at gcc dot gnu.org
2012-03-22 9:31 ` mark at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: ro at gcc dot gnu.org @ 2011-06-29 10:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48041
Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Last reconfirmed| |2011.06.29 10:20:52
CC| |ro at gcc dot gnu.org
Resolution|FIXED |
Target Milestone|--- |4.7.0
Ever Confirmed|0 |1
--- Comment #3 from Rainer Orth <ro at gcc dot gnu.org> 2011-06-29 10:20:52 UTC ---
Unfortunately, this caused PR debug/49364. I think the patch should be
reverted
or the .debug_abbrev section not be emitted at all in this case.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug debug/48041] dwarf2out emits unnecessary null byte in empty .debug_abbrev section
2011-03-09 9:55 [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section mark at gcc dot gnu.org
` (2 preceding siblings ...)
2011-06-29 10:22 ` ro at gcc dot gnu.org
@ 2012-03-22 8:47 ` rguenth at gcc dot gnu.org
2012-03-22 9:31 ` mark at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-03-22 8:47 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48041
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.7.0 |4.7.1
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-22 08:26:21 UTC ---
GCC 4.7.0 is being released, adjusting target milestone.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug debug/48041] dwarf2out emits unnecessary null byte in empty .debug_abbrev section
2011-03-09 9:55 [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section mark at gcc dot gnu.org
` (3 preceding siblings ...)
2012-03-22 8:47 ` rguenth at gcc dot gnu.org
@ 2012-03-22 9:31 ` mark at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: mark at gcc dot gnu.org @ 2012-03-22 9:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48041
Mark Wielaard <mark at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
--- Comment #5 from Mark Wielaard <mark at gcc dot gnu.org> 2012-03-22 09:22:50 UTC ---
The regression against the mips-sgi-irix vendor tools noted in comment #3 was
fixed in PR debug/49364 through
http://gcc.gnu.org/viewcvs?view=revision&revision=175694
^ permalink raw reply [flat|nested] 6+ messages in thread
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2011-03-09 9:55 [Bug debug/48041] New: dwarf2out emits unnecessary null byte in empty .debug_abbrev section mark at gcc dot gnu.org
2011-03-25 10:17 ` [Bug debug/48041] " mark at gcc dot gnu.org
2011-03-28 9:32 ` mark at gcc dot gnu.org
2011-06-29 10:22 ` ro at gcc dot gnu.org
2012-03-22 8:47 ` rguenth at gcc dot gnu.org
2012-03-22 9:31 ` mark at gcc dot gnu.org
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