[petsc-users] compilation of fortran program that uses petsc hangs

[Ruyter de Wildt, Martijn de]

Good morning,

When I try to compile a fortran program that uses petsc, the make command hangs and I can only stop it by killing the make process. I could not find any information about this problem and hope that you can shed some light on it.

I can reproduce the problem with one of the examples that is included in the PETSc installation. To do this, I used the following steps:

  *   export PETSC_DIR=[PETSC_INSTALL_DIR]
  *   export PETSC_ARCH=
  *   mkdir -p test_petsc/build
  *   cp [PETSC_INSTALL_DIR]/share/petsc/examples/src/sys/tutorials/ex16f.F90 test_petsc
  *   cp [PETSC_INSTALL_DIR]/share/petsc/CMakeLists.txt test_petsc
  *   in CMakeLists.txt, I replaced all ‘ex1’ with ’ex16f’ and all ‘.c’ with ‘F.90’.
  *   cd test_petsc/build
  *   cmake ..
  *   make VERBOSE=1
The last command hangs after showing “Scanning dependencies of target test”.

Environment:

  *   HPC with Rocky Linux 9.7
  *   PETSc version 3.25.3, compiled from source using cmake
  *   mpi implementation: Intel  2021.16
  *   compiler: fortran Intel 2025.2.0 ifx
  *   CMake version 3.31.6
Other remarks:

  *   the problem did not occur when we still used an older version of PETSc, version 3.22.4 (without any changes in environment and/or build process)
  *   I can build the c version of the same file, ex16.c, without any problems and delay
  *   the problem seems to occur only when a .h file that depends on petscys.h is included in the fortran file (so also petscmath.h, petscerror.h, petscviever.h, etc.)
  *   it seems that the process gets stuck in an endless loop while scanning dependencies
  *   the actual fortran preprocessor:
     ifx  -I[PETSC_INSTALL_DIR]/include -E ../ex16f.F90 > test.i
does not hang and completes immediately
  *   the problem does not occur for PETSC 3.22.4 but it does occur for versions 3.24.6 and later
  *   with cmake 3.26.5 and 3.29.1 the problem also occurs

Kind regards,

Martijn de Ruyter de Wildt

dr. Martijn de Ruyter de Wildt | senior software engineer
Research & Development | CFD Development
T +31 317 49 35 60 | M +31 639 27 86 06  | M.d.Ruyterd-Wildt at marin.nl | https://urldefense.us/v3/__http://www.marin.nl__;!!G_uCfscf7eWS!Y6BnHJQKe2DGuqnJjk_yE1OUk7XUP-Nmg8aBT0f4h7TGV2qF_Bkf3Sf6n3XP-EKNVytXBEMbq9UBedSMcYjI1ZJXwTJqyxzs0Q$ 
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