Messages in this thread | | | Date | Sat, 5 May 2012 23:00:48 -0300 | Subject | Re: How can I turn off/disable -O2/-Os optimization? | From | Renato Westphal <> |
| |
2012/4/2 Zhihua Che <zhihua.che@gmail.com>: > 在 2012年4月2日 上午12:49,Randy Dunlap <rdunlap@xenotime.net> 写道: >> On 04/01/2012 09:31 AM, Zhihua Che wrote: >> >>> Hi, everyone >>> >>> I'm debugging linux kernel using kgdb/qemu, but I find that the >>> execution order didn't math the program order usually. I guess it was >>> because the compiling optimization. So I decided to remove -O options >>> in Makefiles. >>> First I removed -Ox in variables HOSTCFLAGS/HOSTCXXFLAGS in >>> <src_root_dir>/Makefile around line 248 and -Ox in variable >>> KBUILD_CFLAGS in <src_root_dir>/arch/x86/boot/Makefile around line 55. >>> But it didn't work, the step execution still didn't follow the program >>> order. Then I found I missed -Ox in KBUILD_CFLAGS in >>> <src_root_dir>/Makefile around line 562, so I removed them, but this >>> time, the compiling failed, complaining >>> rcupdate.h:917:2: error: size of unnamed array is negative >>> And finally, after grep, I find there are a load of -O2 option are >>> assigned in a load of Makefiles. So, How could I disable -O >>> optimization for debugging? >>> >>> Thanks for any tips >>> -- >> >> >> You could try the new CONFIG_READABLE_ASM patch: >> http://marc.info/?l=linux-kernel&m=133296079716268&w=2 >> >> >> -- >> ~Randy > > Hi, > I tried your patch, and it seemed not to work:-(. It still didn't > follow the program order
Hi Zhihua Che,
Have you found a solution for this? I'm facing the same problem with KGDB..
-- Renato Westphal -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |