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(g77-295.info)Ugly Assumed-Size Arrays

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Ugly Assumed-Size Arrays
------------------------

   The `-fugly-assumed' option enables the treatment of any array with
a final dimension specified as `1' as an assumed-size array, as if `*'
had been specified instead.

   For example, `DIMENSION X(1)' is treated as if it had read
`DIMENSION X(*)' if `X' is listed as a dummy argument in a preceding
`SUBROUTINE', `FUNCTION', or `ENTRY' statement in the same program unit.

   Use an explicit lower bound to avoid this interpretation.  For
example, `DIMENSION X(1:1)' is never treated as if it had read
`DIMENSION X(*)' or `DIMENSION X(1:*)'.  Nor is `DIMENSION X(2-1)'
affected by this option, since that kind of expression is unlikely to
have been intended to designate an assumed-size array.

   This option is used to prevent warnings being issued about apparent
out-of-bounds reference such as `X(2) = 99'.

   It also prevents the array from being used in contexts that disallow
assumed-size arrays, such as `PRINT *,X'.  In such cases, a diagnostic
is generated and the source file is not compiled.

   The construct affected by this option is used only in old code that
pre-exists the widespread acceptance of adjustable and assumed-size
arrays in the Fortran community.

   *Note:* This option does not affect how `DIMENSION X(1)' is treated
if `X' is listed as a dummy argument only *after* the `DIMENSION'
statement (presumably in an `ENTRY' statement).  For example,
`-fugly-assumed' has no effect on the following program unit:

     SUBROUTINE X
     REAL A(1)
     RETURN
     ENTRY Y(A)
     PRINT *, A
     END