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Re: How to build MXE Octave-4.0.0 64 bits with Java support?

From: Rafael Monteiro
Subject: Re: How to build MXE Octave-4.0.0 64 bits with Java support?
Date: Sun, 7 Jun 2015 19:37:52 -0300


Actually it does matter: I wasn't aware of that option! I thought there was only one option to build a 64-bit octave. This "intermediate" option seem to suit my needs perfectly! I'm glad you mentioned that, I'll give it a try, thank you very much! :)

As for 64-bit JDK, apparently it's not installed. All I have is 64-bit JRE. This Debian system was installed (on VMware) only to build Octave, so it doesn't have many packages (only the ones suggested on the tutorial).

If I run "java -version", this is what I get:

$ java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.5) (7u79-2.5.5-1~deb8u1)
OpenJDK 64-Bit Server VM (build 24.79-b02Java , mixed mode)

NOTE: there is no javac installed

Regarding the steps:

First step:
I found a stable-octave file under ~/mxe-octave/log. Here are the relevant lines, I guess:

configure: WARNING: JAVA_HOME environment variable not initialized.  Auto-detection will proceed but is unreliable.
checking for java... /usr/bin/java
checking for javac... no
checking for jar... no
configure: WARNING: No javac compiler or jar executable found.  Octave will not be able to call Java methods.
  Java home:                   /usr/lib/jvm/java-7-openjdk-amd64
  Java JVM path:               
  Java CPPFLAGS:               /home/rafael/mxe-octave/usr/x86_64-w64-mingw32/include/java
  Java libraries:              

Second step:
I'll install the JDK and try this step. Only one more question: do you recommend a specific JDK version? On Debian, I have this package available: openjdk-7-jdk.

Thanks again!

Rafael Monteiro

2015-06-07 18:08 GMT-03:00 Philip Nienhuis <address@hidden>:
Rafael wrote
> Hi,
> I tried to build Octave-4.0.0 using this instructions:
> http://wiki.octave.org/Windows_Installer
> The build was created on a *Debian 8* system using *--enable-64* flag and

While it doesn't matter for your actual question: do you really need 64-bit
indexing?  If you just build with --enable-windows-64, you'll get a 64-bit
Octave with 32-bit indexing that only runs on Win64 and can access double
arrays of 16 GB / complex 32 GB / single & int32 8 GB.  Enough for most

> it works fine on *Windows*, but it looks like the Java interface was not
> built for some reason. If I try to run any Java command, I get something
> like this:
>>> javaclasspath
> error: javaMethod: Octave was not compiled with Java interface
> error: called from
>     javaclasspath at line 64 column 16

Apparently on your Debian system, Java wasn't picked up by the mxe-octave
build system.
Do you have a 64-bit JDK on your Debian system?

mxe-octave should be able to detect it; or rather, the Octave configure
system should, when it is invoked by the mxe build process.

First step:
In mxe-octave (on Debian), look in the log/ directory for "octave", it's a
symlink to the configure and build log for Octave. Look in there to find out
if Octave's configure found the JDK. You can search/grep for "Java home: "
and "Java JVM path:"

Second step:
After having verified that you indeed have a 64-bit JDK installed on Debian,
manually add the required info in the relevant configure stanza in
mxe-octave/src/octave.mk (or .../stable-octave.mk, whatever is mentioned in
the top of mxe-octave/Makefile).  To find out what you need, run
./configure --help in an Octave build directory on Linux, it is something
like --with-java-includedir= and --with-java-libdir=. I'm on Windows now so
I can't check.
Oh, and IIRC it may be that you'd need to omit the include dir itself in the
path, so:
--with-java-includedir=/full/path/to/java/jdk and omit the final /include
(!)  -  just experiment a bit.


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