/usr/lib/petscdir/3.1/include/finclude/ftn-custom/petscdahide.h90 is in libpetsc3.1-dev 3.1.dfsg-11ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #if defined(PETSC_USE_FORTRAN_DATATYPES) && !defined(DM_HIDE)
#define DM_HIDE type(DM)
#define DA_HIDE type(DA)
#define USE_DA_HIDE use petscdadef
#elif !defined(DM_HIDE)
#define DM_HIDE DM
#define DA_HIDE DA
#define USE_DA_HIDE
#endif
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