[Octave-bug-tracker] [bug #50339] configure detection for BLAS does not use -fdefault-integer-8

[Mike Miller]

Follow-up Comment #11, bug #50339 (project octave):

That's what I thought.

I am now able to build Octave with all of the Fortran libraries built for
64-bit integers and all tests pass. But I have to build with the following:


./configure \
  CPPFLAGS='-DLONGBLAS=long -DBLAS64' \
  F77_INTEGER_8_FLAG=-fdefault-integer-8 \
  ...


The -D options might not be necessary, they are only for the SuiteSparse
include files. I'll see if I can simplify that part.

But the F77_INTEGER_8_FLAG is necessary to pass into Octave's configure so
that it applies it when testing the various libraries. Otherwise configure
just errors out like I showed in comment #9.

Alternatively I think I can set FFLAGS="-g -O2 -fdefault-integer-8" and
configure will just think that the Fortran compiler does everything right by
default.

This is still an improvement over the previous --enable-64 behavior, we now
have a consistent octave_idx_type on 64-bit systems regardless of how the
Fortran libraries were built. I don't know that I'd call this a regression.
Before the user had to pass --enable-64, now they have to pass something else,
everything works both ways assuming the right libraries and the right flags
are given.

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