Alexander Barth wrote: > On Fri, Jun 5, 2009 at 9:20 PM, David Bateman<dbate...@dbateman.org> wrote: > >> Why not just use >> octave_idx_type if the fortran logical index is 8bit with --enable-64? >> >> > > This is in the end what I did, but I declared a macro > octave_f77_bool_type defined as octave_idx_type. > > The underlying assumption is that the Fortran compiler uses the same > amount of bytes for INTEGER and LOGICAL. I would prefer to "hide" this > assumption behind a macro since there might be some Fortran compilers > that handle things differently. (After all, it is quite wasteful to > allocate 8 bytes for a variable with only two states). > > I looked a bit around how the different Fortran compilers handle the > size of LOGICALs. For gfortran (with and without -fdefault-integer-8) > and ifort (with and without -i8), the size of LOGICALs will always be > the size of INTEGER. However, with pgf90, the compiler option -i8, > leaves the size of LOGICALs to 4 bytes. Only the option -i8storage > allocates 8 bytes for INTEGER and LOGICAL. > > This reminds me also a bit of the assumption that size of a pointer > will always be the same as the size of an int in C. Such assumption is > the classical problem when porting a program to 64-bit CPU. > > Cheers, > Alex > Grrr, then we need an autoconf test that probes the number of bytes in a fortran logical type and sets your macro appropriately...
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