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[Bug breakpoints/12156] New: cannot break on static functions withgcc flto (link time optimization)
- From: "chantry.xavier at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Sat, 23 Oct 2010 14:51:31 +0000
- Subject: [Bug breakpoints/12156] New: cannot break on static functions withgcc flto (link time optimization)
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=12156
Summary: cannot break on static functions with gcc flto (link
time optimization)
Product: gdb
Version: unknown
Status: NEW
Severity: normal
Priority: P2
Component: breakpoints
AssignedTo: unassigned@sourceware.org
ReportedBy: chantry.xavier@gmail.com
Created attachment 5082
--> http://sourceware.org/bugzilla/attachment.cgi?id=5082
minimal test case with one static function foo
When compiling with gcc -flto, static symbols get a number suffix/extension.
e.g. foo becomes foo.2043
break foo<tab> expands to break foo.2043, but neither works.
The only way to actually set the break point is to specify the address
directly.
[xavier@xps-m1530 ~]$ gcc -flto test.c
[xavier@xps-m1530 ~]$ objdump -d a.out | grep foo
00000000004004c4 <foo.2043>:
4004d8: e8 e7 ff ff ff callq 4004c4 <foo.2043>
[xavier@xps-m1530 ~]$ gdb a.out
GNU gdb (GDB) 7.2.50.20101022-cvs
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/xavier/a.out...(no debugging symbols found)...done.
(gdb) break foo.2043
Can't find member of namespace, class, struct, or union named "foo.2043"
Hint: try 'foo.2043<TAB> or 'foo.2043<ESC-?>
(Note leading single quote.)
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (foo.2043) pending.
(gdb) break foo
Function "foo" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 2 (foo) pending.
(gdb) run
Starting program: /home/xavier/a.out
bar
Program exited with code 04.
(gdb) break *0x4004c4
Breakpoint 3 at 0x4004c4
(gdb) run
Starting program: /home/xavier/a.out
Breakpoint 3, 0x00000000004004c4 in foo.2043 ()
(gdb) c
Continuing.
bar
Program exited with code 04.
(gdb)
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