Messages in this thread | | | Date | Mon, 2 Apr 2012 00:31:35 +0800 | Subject | How can I turn off/disable -O2/-Os optimization? | From | Zhihua Che <> |
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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?
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