./configure fails for octave 3.4.0 with gcc 4.6. Error: gfortran generates correct size integers... no

[John W. Eaton]

On 11-Apr-2011, Van Wieren, Peter AVLNA wrote:

| I complied and installed the latest gcc (v4.6), and proceeded to use it
| to compile octave.  The following error message occurs:
| 
| checking for Fortran 77 libraries of
| /work/apps/x86_64-rhes5-linux/bin/gfortran...
| -L/work/apps/x86_64-rhes5-linux/lib
| -L/work/apps/x86_64-rhes5-linux/lib/gcc/x86_64-unknown-linux-gnu/4.6.0
| -L/work/apps/x86_64-rhes5-linux/lib/gcc/x86_64-unknown-linux-gnu/4.6.0/.
| ./../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64
| -L/work/apps/x86_64-rhes5-linux/lib/gcc/x86_64-unknown-linux-gnu/4.6.0/.
| ./../.. -lpthread -lgfortran -lm -lquadmath
| /work/apps/x86_64-rhes5-linux/lib/libgfortran.a
| /work/apps/x86_64-rhes5-linux/lib/libquadmath.a
| checking for dummy main to link with Fortran 77 libraries... none
| checking for Fortran 77 name-mangling scheme... lower case, underscore,
| no extra underscore
| configure: defining FFLAGS to be -O
| checking whether /work/apps/x86_64-rhes5-linux/bin/gfortran generates
| correct size integers... no
| configure: error: your Fortran compiler must have an option to make
| integers the same size as octave_idx_type (int).  See the file INSTALL
| for more information.

To debug the problem, you need to look at the config.log file to see
why this test failed.

If you want help doing that, then post the relevant part of config.log
here.  There's no need to post the whole file, and it would be
rejected for posting here anyway as it will probably be over the limit
for postings sent to the list.

jwe