Possible misoptimization with LTO?

[NTULINUX]

Linking halrmt
hal/utils/../hal_priv.h:135:27: warning: type of ‘hal_data’ does not match original declaration [-Wlto-type-mismatch]
  135 | extern struct hal_data_t *hal_data;
      |                           ^
hal/utils/../hal_priv.h:248:16: note: type ‘struct hal_data_t’ should match type ‘struct hal_data_t’
  248 | typedef struct hal_data_t {
      |                ^
hal/utils/../hal_priv.h:135:27: note: ‘hal_data’ was previously declared here
  135 | extern struct hal_data_t *hal_data;
      |                           ^
hal/utils/../hal_priv.h:135:27: note: code may be misoptimized unless ‘-fno-strict-aliasing’ is used
Linking halmeter

Happens when building LinuxCNC with -flto and GCC 16.

[BsAtHome]

You cannot build with -flto. There are too many assumptions of how code is laid out. Having the linker interfere is just asking for disasters to happen. And the HAL code is very tricky business...