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 ?
