Dear Barry
thank you very much for this very detailed answer. It's perfectly clear now.
I'll start writing the missing interfaces
I need to wait until I have made progress on writing the interfaces before
deciding whether to create a pull request or send part of the interface
definitions.
In any ca
PETSc uses the Sowing packages bfort tool for automatically generating
"Fortran stub functions" and interface definitions. There are certain C
functions that bfort cannot handling including (at least)
1) functions with character string arguments
2) functions with function pointer argument
