USART_DELAY OFF error when it's within a #ifdef ... #endif

[R. G. Keen]

Got strange results with USART_DELAY OFF and #ifdef ... #endif.
If the delay setting is inside the ifdef...endif, I get

IFDEF/OFF: USART_DELAY equates to 1MS and cannot be reassigned to equate to OFF

Moving it outside the #ifdef... #endif produces no error. There are other #defines inside the ifdef that produce no error.

#chip 16F18044, 32  ' 32MHz
#Option Explicit

#define SerialOutput
#startup InitPPS, 85            ' have to run PPS Before HSER runs

#ifdef SerialOutput
#define USART_DELAY OFF
#define USART_BAUD_RATE 115200  ' Define desired baud rate
#define USART_TX_BLOCKING 
#endif

... produces the error message, moving it above the #ifdef does not reproduce the error.
Moving it after USART_BLOCKING also causes the error.

Particulars:
GCBASIC (2026.09.27(Windows 64 bit) : Build 1653)

I figure there is some obscure rule I haven't found in the documentation and/or forum, but I've tried and I'm baffled. I can work around it by moving the define outside the ifdef, but I was trying to neatly encapsulate the serial stuff with an ifdef.

[Anobium]

A script is the answer.

#chip 16F18044, 32  ' 32MHz
#Option Explicit

#define SerialOutput
#startup InitPPS, 85            ' have to run PPS Before HSER runs

#script
ifdef SerialOutput then
USART_DELAY = OFF
USART_BAUD_RATE = 115200  ' Define desired baud rate
USART_TX_BLOCKING = True
end if
#script

Untested, but, a script is the method to use.

[Anobium]

Correct/tested and it works

#chip 16F18044, 32  ' 32MHz
#Option Explicit

#define SerialOutput
// #startup InitPPS, 85            ' have to run PPS Before HSER runs

#script
    if def(SerialOutput) then
        USART_DELAY = OFF
        USART_BAUD_RATE = 115200  ' Define desired baud rate
        USART_TX_BLOCKING = True
        INFO "Serial Setup"
    else
        INFO "Serial Not setup"
    end if
#endscript