Can I guarantee `allocatable` variables to start out not allocated?

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I’ve come across the following question on StackOverflow, which may be related to the unexpected behavior of allocatable by Gfortran (linked in the above post, which is still reproducible with Gfortran-14 on Godbolt). Indeed, this may be a bug of the option -fmax-stack-var-size itself, though not sure about details.

EDIT: Here is the man page for this option.

This option currently only affects local arrays declared with constant bounds, and may not apply to all character variables.

Also a previous thread on this option (not related to the above issue):

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