https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105253

            Bug ID: 105253
           Summary: __popcountdi2 calls generated in kernel code with
                    gcc12
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: raj.khem at gmail dot com
  Target Milestone: ---

Created attachment 52794
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52794&action=edit
test case

gcc 12 when using -march=core2 generates __popcountdi2 calls which go
unresolved in kernel and build fails. When I use -march=corei7 then the calls
are optimized away.
Interestingly, gcc-11 did not emit these calls even with -march=core2,

a similar error is seen when compiling kernel for arm

arm-yoe-linux-gnueabi-ld.bfd: arch/arm/probes/kprobes/actions-common.o: in
function `simulate_ldm1stm1':
actions-common.c:(.kprobes.text+0x74): undefined reference to `__popcountsi2'

Attached testcase demonstrates the behaviour on x86_64. Is it expected behavior
in gcc 12 ?

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