message: configure: Initialise assembly enable_* variables
diff: @@ -314,6 +314,11 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
  AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough],[NOWARN_CXXFLAGS="$NOWARN_CXXFLAGS -Wno-implicit-fallthrough"],,[[$CXXFLAG_WERROR]])
  fi
  +enable_hwcrc32=no
  +enable_sse41=no
  +enable_avx2=no
  +enable_shani=no
  +
  if test "x$use_asm" = "xyes"; then
  # Check for optional instruction set support. Enabling these does _not_ imply that all code will
  