Linker fails when used RA6 + ThreadX with Option -flto

[sebastian-dev]

Create a new C/C++ Project with any RA6 + ThreadX. When you enable the Link Time Optimizer (-flto) in the options the linker fails with the error: ../ra/fsp/src/rm_threadx_port/tx_thread_schedule.c:325:(.text.PendSV_Handler+0x68): undefined reference to _tx_port_wait_thread_ready'

to fix this issue you have to change in tx_thread_schedule.c the function: from: __attribute((weak)) void * _tx_port_wait_thread_ready (VOID) to __attribute((weak, used)) void * _tx_port_wait_thread_ready (VOID)

[renesas-brandon-hussey]

This is being internally tracked using FSPRA-2284.