[petsc-users] petscerror.h is potentially missing includes

[meator]

Hello. I have skimmed through PETSc's documentation to see whether PETSc 
has any special policy for including header files, but I didn't find 
anything, so I assume that standard C rules apply.

The problematic header file is <petscerror.h>. The following code 
doesn't compile:

     #include <petscerror.h>

     int main() { return 0; }

It fails because <petscerror.h> expects `MPI_Comm` to be defined, but it 
is (I assume) lacking appropriate includes which would define it. This 
is unfortunate, because many linters targeting C/C++ sort header files 
alphabetically. Since "petsc" is the common prefix for most PETSc header 
files, `petscerror.h` was put first in my header list because it begins 
with an "e".

I'm using PETSc version 3.21.3.

Thanks in advance
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