Building octave on a Mac with g95

[Joe Koski]

With some help from the Apple unix-porting list and the g95 compiler
developer, Andy Vaught, I have successfully built octave-2.1.72 with g95 on
my Mac. My system is still at OS X 10.3.9, so I can't confirm that this
approach works for OS X 10.4, but it should be worth a try. The g95 compiler
is built with gcc-4.0.1, so it may be more compatible with the OS X 10.4
developer tools.

There was a problem because Linux and Macs do not access environment
variables the same way. Andy applied a patch to the Jan. 10, 2006 version of
g95 that solved the problem. The g95 compiler is easy to install and upgrade
with the use of a single symbolic link in /usr/local/bin (or wherever you
like). The instructions are on the web site (http://g95.sourceforge.net/).

To build octave with the bash shell, first, when starting in the octave
build directory

  export LDFLAGS="-L/usr/lib -lcc_dynamic"

This picks up some undefined symbols (saveFP and restFP). This approach also
works with gfortran and g77 on my machine.

Then ./configure --enable-shared --disable-static F77=/usr/local/lib/g95 (or
wherever your symbolic link to g95 is located) and make as usual.

It's relatively straight forward, once you know how, but it took me a week
of part-time tinkering and e-mailing to find out how.

Joe











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