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(g77-295.info)READONLY Keyword

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`READONLY' Keyword
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   Support for `READONLY', in `OPEN' statements, requires `libg2c'
support, to make sure that `CLOSE(...,STATUS='DELETE')' does not delete
a file opened on a unit with the `READONLY' keyword, and perhaps to
trigger a fatal diagnostic if a `WRITE' or `PRINT' to such a unit is
attempted.

   *Note:* It is not sufficient for `g77' and `libg2c' (its version of
`libf2c') to assume that `READONLY' does not need some kind of explicit
support at run time, due to UNIX systems not (generally) needing it.
`g77' is not just a UNIX-based compiler!

   Further, mounting of non-UNIX filesystems on UNIX systems (such as
via NFS) might require proper `READONLY' support.

   (Similar issues might be involved with supporting the `SHARED'
keyword.)