Configuring Octave

[John W. Eaton]

On 22-Jul-2008, Labitt, Bruce wrote:

| Thanks Carlo.  It still dies on me.
| 
| In config.log it now says:
| 
| /usr/bin/ld: skipping incompatible /usr/lib/libpcre.so when searching
| for -lpcre
| /usr/bin/ld: skipping incompatible /usr/lib/libpcre.a when searching for
| -lpcre
| /usr/bin/ld: cannot find -lpcre
| 
| ??? I thought LIBS="-L/lib64/ -lpcre" pointed the system to look in
| /lib64 ???

You should put -L flags in LDFLAGS, like this:

  configure LDFLAGS=-L/lib64

| > ./configure --with-f77=gfortran --with-blas=/usr/lib64/libblas.so
| > --with-lapack=/usr/lib64/liblapack.so --enable-shared --enable-64
| > LIBS="-l/lib64/libpcre.so"

It is probably also better to use

  configure ... F77=gfortran

and add -L/usr/lib64 to LDFLAGS, then omit the --with-blas and
--with-lapack options.

The --enable-shared option is the default, so you don't need to
specify it.

You do realize that --enable-64 is experimental, right?  If you are
using this option, you must ensure that all Fortran bits (lapack,
blas, etc.) have been compiled to use 8-byte integers, so you will
likely need to use the -fdefault-integer-8 option for gfortran.

So, all together, the configure command would look something like
this (split across lines for easier reading):

  configure --enable-64 LDFLAGS="-L/lib64 -L/usr/lib64"
            F77=gfortran FFLAGS="-fdefault-integer-8 -O2"

jwe