s-watanabe314 wrote:

> If a user explicitly uses REAL(16). say in a variable declaration, what 
> effect will this option have?

Any explicit use of `REAL(16)` becomes a compile-time error. As shown in 
`disable-real-16.f90`, when `-fdisable-real-16` is specified, `REAL(16)` is 
treated as unsupported regardless of the target architecture, so declarations 
such as `REAL(16) :: x` are always rejected.

https://github.com/llvm/llvm-project/pull/221904
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