Thanks for the alternative. @jed does this mean we need to do our casting of functions like this everywhere?
> On Jan 11, 2022, at 12:11 PM, Zou, Ling <l...@anl.gov> wrote: > > A follow up: > > The compiler option '-Wno-bad-function-cast' did not work for c++. See > message below: > cc1plus: error: command line option '-Wno-bad-function-cast' is valid for > C/ObjC but not for C++ [-Werror] > > Credit to David Andrs of INL, here is an alternative solution: > > MatFDColoringSetFunction(fdcoloring, > (PetscErrorCode(*)(void))(void(*)(void))SNESFormFunction, this); > > Thanks, > > -Ling > > From: petsc-users <petsc-users-boun...@mcs.anl.gov > <mailto:petsc-users-boun...@mcs.anl.gov>> on behalf of Zou, Ling via > petsc-users <petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> > Date: Monday, January 10, 2022 at 9:23 PM > To: Barry Smith <bsm...@petsc.dev <mailto:bsm...@petsc.dev>> > Cc: PETSc <petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> > Subject: Re: [petsc-users] A problem with MatFDColoringSetFunction > > Thank you Barry. > > -Ling > > From: Barry Smith <bsm...@petsc.dev <mailto:bsm...@petsc.dev>> > Date: Monday, January 10, 2022 at 5:13 PM > To: Zou, Ling <l...@anl.gov <mailto:l...@anl.gov>> > Cc: PETSc <petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> > Subject: Re: [petsc-users] A problem with MatFDColoringSetFunction > > > This is annoying. You need to pass in a compiler flag to turn off the error > conditioner for casting a function pointer. It may be > -Wnoerror=cast-function-type just google. > > Barry > > > > On Jan 10, 2022, at 4:35 PM, Zou, Ling via petsc-users > <petsc-users@mcs.anl.gov <mailto:petsc-users@mcs.anl.gov>> wrote: > > Hi All, > > I would appreciate if you could give some advice for setting the > ‘FormFunction’ for the MatFDColoringSetFunction function call. > I follow what is shown in the example: > https://petsc.org/release/src/snes/tutorials/ex14.c.html > <https://petsc.org/release/src/snes/tutorials/ex14.c.html> > > I setup similar code structure like: > PetscErrorCode FormFunction(SNES,Vec,Vec,void*); > Then use it as: > MatFDColoringSetFunction(fdcoloring, > (PetscErrorCode(*)(void))SNESFormFunction, this); > > This works fine on my local MacOS. However, when commit it to a remote repo, > the compiler there gives me the following error (where warnings are treated > as errors): > > src/base/PETScProblemInterface.C:100:67: error: > cast between incompatible function types from > 'PetscErrorCode (*)(SNES, Vec, Vec, void*)' {aka 'int (*)(_p_SNES*, _p_Vec*, > _p_Vec*, void*)'} > to > 'PetscErrorCode (*)()' {aka 'int (*)()'} [-Werror=cast-function-type] > > Any help is appreciated. > > -Ling
