[petsc-users] A problem with MatFDColoringSetFunction

[Barry Smith]

  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 at 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

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