[Bug middle-end/81907] New: undefined reference to `memset'

["dongkyun.s at samsung dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81907

            Bug ID: 81907
           Summary: undefined reference to `memset'
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dongkyun.s at samsung dot com
  Target Milestone: ---

Created attachment 42013
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42013&action=edit
memset_test

Compiling the attached source without memset trivial implementation,

Failed by undefined reference to `memset'
OPTFLAGS = -Os -g -mabi=aapcs -fno-function-sections -Wall -mfloat-abi=soft
-mtune=cortex-a9

Succeeded with option
OPTFLAGS = -Os -g -mabi=aapcs -fno-function-sections -Wall -mfloat-abi=soft
-mtune=cortex-a12

Using -O2 instead of -Os (Optimization level) also fix this fail.
What is different optimization behavior(implementation) in GCC between
cortex-a9 and cortex-a12 -given by mcpu or mtune option ?

Found related issue in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888.