[Bug fortran/97024] New: Overriding finalization on polymorphic types triggers ICE error in generate_finalization_wrapper

[Bug fortran/97024] New: Overriding finalization on polymorphic types triggers ICE error in generate_finalization_wrapper

[jhaiduce at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97024

            Bug ID: 97024
           Summary: Overriding finalization on polymorphic types triggers
                    ICE error in generate_finalization_wrapper
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jhaiduce at gmail dot com
  Target Milestone: ---

Created attachment 49209
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49209&action=edit
Minimum working example

The attached MWE contains declarations of two derived types, one inheriting
from the other. The child type contains a finalization procedure. An
allocatable object of the parent class is created, and assigned to an object of
the child class. This triggers an internal compiler error.

GCC version: 10.5.1
System type: MacOS 10.14.6

Output from gcc -v:

Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
--with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

GCC command line: gfortran -o test.o -c test.f90

GCC compiler output:

f951: internal compiler error: in generate_finalization_wrapper, at
fortran/class.c:2009
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://github.com/Homebrew/homebrew-core/issues> for instructions.

Adding -save-temps to the command line produced an empty file named 'test.s'

[Bug fortran/97024] Overriding finalization on polymorphic types triggers ICE error in generate_finalization_wrapper

[jhaiduce at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97024

--- Comment #1 from John Haiducek <jhaiduce at gmail dot com> ---
This bug shows some similarity to 92587 and 82996, but I suspect they are
distinct. 92587 had a much more complicated MWE and the OP was unable to reduce
it to a single file. 82996 did not involve class polymorphism, which seems to
be required to trigger this bug. Someone with better knowledge of the compiler
might be able to identify a common cause however.

[Bug fortran/97024] Overriding finalization on polymorphic types triggers ICE error in generate_finalization_wrapper

[jhaiduce at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97024

--- Comment #2 from John Haiducek <jhaiduce at gmail dot com> ---
For the sake of convenience (so there are links to click) the above-mentioned
bugs were bug 92587 and bug 82996.

[Bug fortran/97024] Overriding finalization on polymorphic types triggers ICE error in generate_finalization_wrapper

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97024

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-12-02
             Status|UNCONFIRMED                 |WAITING

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed from GCC9 up to trunk.

[Bug fortran/97024] Overriding finalization on polymorphic types triggers ICE error in generate_finalization_wrapper

[pault at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97024

Paul Thomas <pault at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pault at gcc dot gnu.org

--- Comment #4 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #3)
> Confirmed from GCC9 up to trunk.

I am completely unable to reproduce the ICE on FC13/x86_64 with GNU Fortran
(GCC) 9.3.1 20210315 through to mainline 12.0.1 20220119 (experimental).

module m
  type::t1
  end type t1
  type,extends(t1)::t2
   contains
     final::t2_finalize
  end type t2
contains
  subroutine t2_finalize(this)
    type(t2)::this
    print *, "finalize"
  end subroutine t2_finalize
  subroutine err()
    class(t1),allocatable::o1
    type(t2)::o2
    o1=o2
  end subroutine err
end module m

  use m
  call err
end

produces the expected output ("finalize" twice).

Paul