[Bug c/81629] New: redefined memcpy leads to segmentation fault

["frederic.besson at inria dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81629

            Bug ID: 81629
           Summary: redefined memcpy leads to segmentation fault
           Product: gcc
           Version: 7.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: frederic.besson at inria dot fr
  Target Milestone: ---

Hi,

The simple code below crashes with  internal compiler error: Segmentation
fault.
It seems gcc does not like the redefinition of memcpy.


extern unsigned long long memcpy(unsigned long long, unsigned long long,
unsigned long long);

void foo(unsigned long long ctx, unsigned long long output)
{
  memcpy(ctx + 2LLU, ctx,  1U);
  return;
}


Best regards,