[petsc-dev] Including petsc.h breaks user code

[Pierre Jolivet]

Hello,
Could you please explain to me why the following example is not working properly when <petsc.h> (from master, with OpenMPI 1.8.1) is included ?

$ mpicxx in-place.cpp  -I$PETSC_DIR/include -I$PETSC_DIR/$PETSC_ARCH/include -L$PETSC_DIR/$PETSC_ARCH/lib -lpetsc
$ mpirun -np 2 ./a.out
Done with the scatter !
0 0 0 0 (this line should be filled with 0)
1 1 1 1 (this line should be filled with 1)
Done with the gather !

$ mpicxx in-place.cpp  -I$PETSC_DIR/include -I$PETSC_DIR/$PETSC_ARCH/include -L$PETSC_DIR/$PETSC_ARCH/lib -lpetsc -DPETSC_BUG
$ mpirun -np 2 ./a.out
[:3367] *** An error occurred in MPI_Type_size
[:3367] *** reported by process [4819779585,140733193388032]
[:3367] *** on communicator MPI_COMM_WORLD
[:3367] *** MPI_ERR_TYPE: invalid datatype
[:3367] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
[:3367] ***    and potentially your MPI job)

Thank you for looking,
Pierre

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