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From: "chantry.xavier at gmail dot com" <sourceware-bugzilla@sourceware.org> To: gdb-prs@sourceware.org Subject: [Bug breakpoints/12156] New: cannot break on static functions with gcc flto (link time optimization) Date: Sat, 23 Oct 2010 14:51:00 -0000 [thread overview] Message-ID: <bug-12156-4717@http.sourceware.org/bugzilla/> (raw) 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) -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next reply other threads:[~2010-10-23 14:51 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-10-23 14:51 chantry.xavier at gmail dot com [this message] 2010-11-15 17:11 ` [Bug breakpoints/12156] " tromey at redhat dot com 2010-11-21 18:08 ` chantry.xavier at gmail dot com
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