[CMake] set(a b); set(b c); if(a STREQUAL b OR a STREQUAL c) ...

[Chuck Atkins]

>  Command `if(a MATCHES ...)` has the same flaw: `if(<variable|string>
> MATCHES regex)`:
> ..
> set(MYSTRING "B")
> set(A "MYSTRING")
> if("${A}" MATCHES "^MYSTRING$")
>   # do *not* go here even A is MYSTRING (use *variable* MYSTRING)
> endif()
>

This should work without dereferencing A, i.e.:

if(A MATCHES "^MYSTRING$")
  # Bingo
endif()
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