[bug #57299] util/setbaud.h incompatible with new AVR iom*.h headers

[Matt Wette]

URL:
  <https://savannah.nongnu.org/bugs/?57299>

                 Summary: util/setbaud.h incompatible with new AVR iom*.h
headers
                 Project: AVR C Runtime Library
            Submitted by: mwette
            Submitted on: Mon 25 Nov 2019 10:10:21 AM PST
                Category: Header
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Header files
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 2.0.0
           Fixed Release: None

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Details:

Newer headers povided in the device packs from microchip include a struct for
UARTS that defines a member "BAUD".   This conflicts with the use of command
line argument "-DBAUD-9600U".   Use of this command line argument to avr-gcc
results in compile error:

/opt/local/bin/avr-gcc -mmcu=atmega4809 -DF_CPU=3333333UL -Os -I.. -I../../
-B/opt/local/avr/packs/mega-1.3.300 -DBAUD=9600UL -c main.c -o main.o
In file included from /opt/local/avr/include/avr/io.h:578,
                 from main.c:3:
<command-line>: error: expected identifier or '(' before numeric constant

A solution is to not include util/setbaud.h and instead use command line
argument -DBAUDRATE=9600UL with the following usage:

USART0.BAUD = BAUDRATE;

There is a workable solution but the problem of running into the obscure error
message will persist.  Maybe replacing BAUD with some other convention will
help.




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