Thanks Newton for letting me know it.
Best regards, Justin Guo
-----Original Message----- From: Will Newton [mailto:will.newton@linaro.org] Sent: Friday, March 14, 2014 8:04 AM To: Justin Guo Cc: Linaro Toolchain Subject: Re: build errors
On 13 March 2014 17:17, JustinGuo@via-alliance.com wrote:
Dear Linaro toolchain support team:
I am Justin Guo from S3 graphics Inc. I am studying linaro's big-little codes and is using TC2 Platform.
I used ./linaro_kernel_build_cmds.sh to build kernel, I got no problem when I set CONFIG_DEBUG_INFO=y to build for kernel.
However, When I trace kernel, the traced line in source code level is jumping up/down, so I tried to turn off the optimization.
After modified Makefile as below to turn off optimization:
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
else
KBUILD_CFLAGS += -O0
It is not possible to build the kernel with -O0 due to various requirements for inlining and register allocation. You could try -O1 or -Og (if your compiler supports it, gcc 4.8 and above).
-- Will Newton Toolchain Working Group, Linaro