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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
end of thread, other threads:[~2012-03-22 9:31 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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