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List:       gcc-fortran
Subject:    Re: [PATCH] Fortran: fix passing of optional dummies to bind(c) procedures [PR113866]
From:       Harald Anlauf <anlauf () gmx ! de>
Date:       2024-02-13 19:28:00
Message-ID: 7b1c29cd-b949-47f1-88ef-9acc058302ad () gmx ! de
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Am 13.02.24 um 19:13 schrieb Harald Anlauf:
> indeed the new testcase just regressed due to commit
> r14-8947-g6caec7d9ec37e6 ... :-(
>
> Reduced testcase which fails on trunk:
>
> program p
>     implicit none
>     integer, parameter :: n = 100, l = 10
>     character(l) :: a = 'a234567890', b(n) = 'bcdefghijk'
>     character(:), allocatable :: d, e(:)
>     allocate (d, source=a)
>     allocate (e, source=b)
>     print *, len (d), len (e), size (e)
>     call not_bindc_optional_deferred (d, e)
>     deallocate (d, e)
> contains
>     subroutine not_bindc_optional_deferred (c5, c6)
>         character(:), allocatable, optional :: c5, c6(:)
>         if (.not. present (c5) .or. .not. present (c6)) stop 6
>         print *, len (c5), len (c6), size (c6)
>         if (len (c5) /= l .or. len (c6) /= l) stop 84
>     end
> end
>
> Expected:
>
>                     10                   10                 100
>                     10                   10                 100
>
> After above commit:
>
>                     10                   10                 100
>                     10                     0                 100
> STOP 84

This is now tracked as::

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113911

> Will have to wait until the cause is found and fixed...

As it is sufficient to disable the deferred-length test,
I've done that and pushed the amended patch as

https://gcc.gnu.org/g:f4935df217ad89f884f908f39086b322e80123d0

Thanks,
Harald


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