* [BUG]Something wrong with evaluate @ 2011-05-21 16:09 Hui Zhu 2011-05-21 16:19 ` Jan Kratochvil 0 siblings, 1 reply; 6+ messages in thread From: Hui Zhu @ 2011-05-21 16:09 UTC (permalink / raw) To: gdb gdb ./vmlinux GNU gdb (GDB) 7.3.50.20110521-cvs (gdb) p 123*4 GDB does not (yet) know how to evaluate that kind of expression /usr/bin/gdb ./vmlinux GNU gdb (GDB) 7.2-ubuntu (gdb) p 123*4 $1 = 492 What is happen? Thanks, Hui ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate 2011-05-21 16:09 [BUG]Something wrong with evaluate Hui Zhu @ 2011-05-21 16:19 ` Jan Kratochvil 2011-05-21 16:27 ` Hui Zhu 0 siblings, 1 reply; 6+ messages in thread From: Jan Kratochvil @ 2011-05-21 16:19 UTC (permalink / raw) To: Hui Zhu; +Cc: gdb On Sat, 21 May 2011 18:08:13 +0200, Hui Zhu wrote: > GDB does not (yet) know how to evaluate that kind of expression gdb: gdb forgot how to do arithmetic https://bugzilla.redhat.com/show_bug.cgi?id=635508 -> gcc: -O1 wrong-code by cmove https://bugzilla.redhat.com/show_bug.cgi?id=634757 -> gcc: [4.5/4.6 Regression] -O1 wrong-code by cmove http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45695 Regards, Jan ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate 2011-05-21 16:19 ` Jan Kratochvil @ 2011-05-21 16:27 ` Hui Zhu 2011-05-21 16:31 ` Jan Kratochvil 0 siblings, 1 reply; 6+ messages in thread From: Hui Zhu @ 2011-05-21 16:27 UTC (permalink / raw) To: Jan Kratochvil; +Cc: gdb That is a gcc bug? Thanks, Hui On Sun, May 22, 2011 at 00:18, Jan Kratochvil <jan.kratochvil@redhat.com> wrote: > On Sat, 21 May 2011 18:08:13 +0200, Hui Zhu wrote: >> GDB does not (yet) know how to evaluate that kind of expression > > gdb: gdb forgot how to do arithmetic > https://bugzilla.redhat.com/show_bug.cgi?id=635508 > -> > gcc: -O1 wrong-code by cmove > https://bugzilla.redhat.com/show_bug.cgi?id=634757 > -> > gcc: [4.5/4.6 Regression] -O1 wrong-code by cmove > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45695 > > > Regards, > Jan > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate 2011-05-21 16:27 ` Hui Zhu @ 2011-05-21 16:31 ` Jan Kratochvil 2011-05-21 16:34 ` Hui Zhu 0 siblings, 1 reply; 6+ messages in thread From: Jan Kratochvil @ 2011-05-21 16:31 UTC (permalink / raw) To: Hui Zhu; +Cc: gdb On Sat, 21 May 2011 18:26:10 +0200, Hui Zhu wrote: > That is a gcc bug? Yes, at least I got this message due to a GCC Bug already fixed some time ago, one can find it in the Bugs. Unaware if the GCC Bug is gets exploited by every GDB version or just by some specific GDB versions. Do you have the problem reproducible if you (re)build that GDB with -O0? Sure it can be also a completely different problem but I doubt so. Regards, Jan ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate 2011-05-21 16:31 ` Jan Kratochvil @ 2011-05-21 16:34 ` Hui Zhu 2011-05-22 2:42 ` Hui Zhu 0 siblings, 1 reply; 6+ messages in thread From: Hui Zhu @ 2011-05-21 16:34 UTC (permalink / raw) To: Jan Kratochvil; +Cc: gdb On Sun, May 22, 2011 at 00:31, Jan Kratochvil <jan.kratochvil@redhat.com> wrote: > On Sat, 21 May 2011 18:26:10 +0200, Hui Zhu wrote: >> That is a gcc bug? > > Yes, at least I got this message due to a GCC Bug already fixed some time ago, > one can find it in the Bugs. Unaware if the GCC Bug is gets exploited by > every GDB version or just by some specific GDB versions. > > Do you have the problem reproducible if you (re)build that GDB with -O0? > > Sure it can be also a completely different problem but I doubt so. > > > Regards, > Jan > Hi Jan, My part -O0 gdb is OK. This is a gcc bug. I just update my gcc to 4.5. I will report it to ubuntu. Thanks for your help. Best, Hui ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate 2011-05-21 16:34 ` Hui Zhu @ 2011-05-22 2:42 ` Hui Zhu 0 siblings, 0 replies; 6+ messages in thread From: Hui Zhu @ 2011-05-22 2:42 UTC (permalink / raw) To: gdb; +Cc: Jan Kratochvil Just a small remind. Tracepoint action teval is affected by this issue too. Thanks, Hui On Sun, May 22, 2011 at 00:33, Hui Zhu <teawater@gmail.com> wrote: > On Sun, May 22, 2011 at 00:31, Jan Kratochvil <jan.kratochvil@redhat.com> wrote: >> On Sat, 21 May 2011 18:26:10 +0200, Hui Zhu wrote: >>> That is a gcc bug? >> >> Yes, at least I got this message due to a GCC Bug already fixed some time ago, >> one can find it in the Bugs. Unaware if the GCC Bug is gets exploited by >> every GDB version or just by some specific GDB versions. >> >> Do you have the problem reproducible if you (re)build that GDB with -O0? >> >> Sure it can be also a completely different problem but I doubt so. >> >> >> Regards, >> Jan >> > > Hi Jan, > > My part -O0 gdb is OK. This is a gcc bug. I just update my gcc to > 4.5. I will report it to ubuntu. > Thanks for your help. > > Best, > Hui > ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-05-22 2:42 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-05-21 16:09 [BUG]Something wrong with evaluate Hui Zhu 2011-05-21 16:19 ` Jan Kratochvil 2011-05-21 16:27 ` Hui Zhu 2011-05-21 16:31 ` Jan Kratochvil 2011-05-21 16:34 ` Hui Zhu 2011-05-22 2:42 ` Hui Zhu
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