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SubjectRe: [PATCH 2/4] trace: avoid calling cc-option -mrecord-mcount for every Makefile
On Mon, Aug 06, 2018 at 03:17:44PM +0200, Vasily Gorbik wrote:
> Currently if CONFIG_FTRACE_MCOUNT_RECORD is enabled -mrecord-mcount
> compiler flag support is tested for every Makefile.

Good catch. Does it make a measurable compile time difference?

>
> Top 4 cc-option usages:
> 511 -mrecord-mcount
> 11 -fno-stack-protector
> 9 -Wno-override-init
> 2 -fsched-pressure
>
> To address that move cc-option from scripts/Makefile.build to top Makefile
> and export CC_USING_RECORD_MCOUNT to be used in original place.
>
> While doing that also add -mrecord-mcount to CC_FLAGS_FTRACE (if gcc
> actually supports it).
>
> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

Acked-by: Andi Kleen <ak@linux.intel.com>

-Andi

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