#1107136 gfortran: 14.2.0-1 internal compiler error on arm64/PinePhone with -W(maybe-)uninitialized

Package:
gfortran
Source:
gfortran
Description:
GNU Fortran 95 compiler
Submitter:
Boud Roukema
Date:
2025-06-02 00:05:01 UTC
Severity:
normal
#1107136#5
Date:
2025-06-01 23:11:09 UTC
From:
To:
Dear Maintainer,

    * What led up to the situation?

I tried to compile some fortran source files on my Pinephone,
including the '-Wall' compiler option.

    * What exactly did you do (or not do) that was effective (or
      ineffective)?

My minimal working example is:
--------------------------------------------------
$ cat mwe.f90
function myfunc(xnew) result(ynew)
   real, intent(in) :: xnew(:)
   real :: ynew
   integer :: i
   if(size(xnew).ge.1)then
      ynew = xnew(1)
   endif
end function

$ gfortran -c -Wuninitialized mwe.f90 -o mwe.o ; \
   gfortran -c -Wmaybe-uninitialized mwe.f90 -o mwe.o
--------------------------------------------------



    * What was the outcome of this action?

Every repeat gave the same result:

--------------------------------------------------
during GIMPLE pass: early_uninit
mwe.f90:8:12:

     8 | end function
       |            ^
internal compiler error: Segmentation fault
0xffffxxxx229b __libc_start_call_main
         ../sysdeps/nptl/libc_start_call_main.h:58
0xffffxxxx237b __libc_start_main_impl
         ../csu/libc-start.c:360
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-14/README.Bugs> for instructions.
during GIMPLE pass: early_uninit
mwe.f90:8:12:

     8 | end function
       |            ^
internal compiler error: Segmentation fault
0xffffxxxx229b __libc_start_call_main
         ../sysdeps/nptl/libc_start_call_main.h:58
0xffffxxxx237b __libc_start_main_impl
         ../csu/libc-start.c:360
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-14/README.Bugs> for instructions.



--------------------------------------------------

    * What outcome did you expect instead?

I expected 'mwe.o' to have been created with no reported errors.

Kernel: Linux 6.12-sunxi64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_CRAP

Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gfortran depends on:
ii  cpp                         4:14.2.0-1
ii  cpp-aarch64-linux-gnu       4:14.2.0-1
ii  gcc                         4:14.2.0-1
ii  gfortran-14                 14.2.0-19
ii  gfortran-aarch64-linux-gnu  4:14.2.0-1

gfortran recommends no packages.

Versions of packages gfortran suggests:
pn  gfortran-doc  <none>
----------------------------------------------------------------------

Possibly related: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1106736 (I forgot
to put a 'Subject' for that bug, sorry).

Cheers
Boud
#1107136#10
Date:
2025-06-01 23:55:34 UTC
From:
To:
hi again,

Here's an alternative minimal working example:

----------------------------------------------------------------------
$ cat mwe2.f90
integer function f(x)
   real, intent(in) :: x(:)
   f = size(x)
end function

$ gfortran -c -Wuninitialized mwe2.f90 -o mwe2.o
during GIMPLE pass: early_uninit
mwe2.f90:4:12:

     4 | end function
       |            ^
internal compiler error: Segmentation fault
0xffffxxxx229b __libc_start_call_main
         ../sysdeps/nptl/libc_start_call_main.h:58
0xffffxxxx237b __libc_start_main_impl
         ../csu/libc-start.c:360
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-14/README.Bugs> for instructions.
----------------------------------------------------------------------

and the same with '-Wmaybe-uninitialized'.

Cheers
Boud