Messages in this thread | | | Date | Mon, 2 Apr 2012 16:44:15 +0800 | Subject | Re: How can I turn off/disable -O2/-Os optimization? | From | Zhihua Che <> |
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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 -- 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/
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