/usr/lib/petscdir/3.1/include/finclude/ftn-custom/petscmathide.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 10 11 | #if defined(PETSC_USE_FORTRAN_DATATYPES) && !defined(MAT_HIDE)
#define MAT_HIDE type(Mat)
#define MATFDCOLORING_HIDE type(MatFDColoring)
#define MATNULLSPACE_HIDE type(MatNullSpace)
#define USE_MAT_HIDE use petscmatdef
#elif !defined(MAT_HIDE)
#define MAT_HIDE Mat
#define MATFDCOLORING_HIDE MatFDColoring
#define MATNULLSPACE_HIDE MatNullSpace
#define USE_MAT_HIDE
#endif
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