[petsc-users] Installing PETSc in Ubuntu 24.04 - check test error

[Bodhinanda Chandra]

Dear PETSc community,

I recently tried to install PETSc in Ubuntu 24.04. All seems to work fine,
but one of the check tests ex5f thow the following errors:

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Running PETSc check examples to verify correct installation
Using PETSC_DIR=/home/bchandra/Program/petsc and PETSC_ARCH=arch-linux-c-opt
C/C++ example src/snes/tutorials/ex19 run successfully with 1 MPI process
C/C++ example src/snes/tutorials/ex19 run successfully with 2 MPI processes
C/C++ example src/snes/tutorials/ex19 run successfully with HYPRE
*******************Error detected during compile or link!*******************
See https://urldefense.us/v3/__https://petsc.org/release/faq/__;!!G_uCfscf7eWS!bNBtvML4qAKu9WGzBH2kRjtiP8AwN3ijY4qZngu7nvl_TUwz8pQ6WGyCJh0AtIEOqLHU5NHUJRL1oWg2FeTR0Oz6868$ 
/home/bchandra/Program/petsc/src/snes/tutorials ex5f
*********************************************************
/usr/local/openmpi-4.1.5/bin/mpif90 -fPIC -Wall -ffree-line-length-none
-ffree-line-length-0 -Wno-lto-type-mismatch -Wno-unused-dummy-argument
-Wall -ffree-line-length-none -ffree-line-length-0 -Wno-lto-type-mismatch
-Wno-unused-dummy-argument -O3 -march=native -mtune=native
-I/home/bchandra/Program/petsc/include
-I/home/bchandra/Program/petsc/arch-linux-c-opt/include
-I/usr/local/openmpi-4.1.5/include     ex5f.F90
 -Wl,-rpath,/home/bchandra/Program/petsc/arch-linux-c-opt/lib
-L/home/bchandra/Program/petsc/arch-linux-c-opt/lib
-Wl,-rpath,/usr/local/openmpi-4.1.5/lib -L/usr/local/openmpi-4.1.5/lib
-Wl,-rpath,/usr/lib/gcc/x86_64-linux-gnu/13
-L/usr/lib/gcc/x86_64-linux-gnu/13 -lpetsc -lHYPRE -lflapack -lfblas -lm
-lX11 -lmpi_usempif08 -lmpi_usempi_ignore_tkr -lmpi_mpifh -lmpi -lgfortran
-lm -lgfortran -lm -lgcc_s -lquadmath -lstdc++ -lquadmath -o ex5f
ex5f.F90:439:52:

  439 |       PetscInt  row,col(5),i,j,i1,i5
      |                                                    ^
Warning: ‘col[1]’ may be used uninitialized [-Wmaybe-uninitialized]
ex5f.F90:439:52: Warning: ‘col[2]’ may be used uninitialized
[-Wmaybe-uninitialized]
ex5f.F90:439:52: Warning: ‘col[3]’ may be used uninitialized
[-Wmaybe-uninitialized]
ex5f.F90:476:83:

  476 |                call
MatSetValuesLocal(jac,i1,[row],i1,[col],[v],INSERT_VALUES,ierr)
      |
              ^
Warning: ‘col[4]’ may be used uninitialized [-Wmaybe-uninitialized]
ex5f.F90:439:52:

  439 |       PetscInt  row,col(5),i,j,i1,i5
      |                                                    ^
note: ‘col[4]’ was declared here
ex5f.F90:476:83:

  476 |                call
MatSetValuesLocal(jac,i1,[row],i1,[col],[v],INSERT_VALUES,ierr)
      |
              ^
Warning: ‘v[1]’ may be used uninitialized [-Wmaybe-uninitialized]
ex5f.F90:440:58:

  440 |       PetscScalar two,one,hx,hy,v(5)
      |                                                          ^
note: ‘v[1]’ was declared here
ex5f.F90:476:83:

  476 |                call
MatSetValuesLocal(jac,i1,[row],i1,[col],[v],INSERT_VALUES,ierr)
      |
              ^
Warning: ‘v[2]’ may be used uninitialized [-Wmaybe-uninitialized]
ex5f.F90:440:58:

  440 |       PetscScalar two,one,hx,hy,v(5)
      |                                                          ^
note: ‘v[2]’ was declared here
ex5f.F90:476:83:

  476 |                call
MatSetValuesLocal(jac,i1,[row],i1,[col],[v],INSERT_VALUES,ierr)
      |
              ^
Warning: ‘v[3]’ may be used uninitialized [-Wmaybe-uninitialized]
ex5f.F90:440:58:

  440 |       PetscScalar two,one,hx,hy,v(5)
      |                                                          ^
note: ‘v[3]’ was declared here
ex5f.F90:476:83:

  476 |                call
MatSetValuesLocal(jac,i1,[row],i1,[col],[v],INSERT_VALUES,ierr)
      |
              ^
Warning: ‘v[4]’ may be used uninitialized [-Wmaybe-uninitialized]
ex5f.F90:440:58:

  440 |       PetscScalar two,one,hx,hy,v(5)
      |                                                          ^
note: ‘v[4]’ was declared here
Fortran example src/snes/tutorials/ex5f run successfully with 1 MPI process
Completed PETSc check examples

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

Any ideas what happened and how to fix it? Many thanks in advance.

Kind regards,
Nanda
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