How can i use defined(ARDUINO_T-BEAM) when the '-' character is not accepted by compiler?

[serialrf433]

Hello. The file boards.txt have many different boards defined. Some of them have a name with a '-' inside like the t-beam. When i write software and want to check the board, i would like to use for example the defined(ARDUINO_T-BEAM). But that is not possible. The compiler does not accept '-' in defined().

Thats how the compiler error looks like:

error: missing binary operator before token "BEAM"
   42 |   #elif defined(ARDUINO_T-BEAM)
      |                           ^~~~

Could someone tell me how this can be used in such a use case? I searched for some time but was not able to find an answer.