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Date: Sun, 01 Apr 2012 09:49:53 -0700 From: Randy Dunlap <rdunlap@...otime.net> To: Zhihua Che <zhihua.che@...il.com> CC: linux-kernel@...r.kernel.org Subject: Re: How can I turn off/disable -O2/-Os optimization? 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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