Octave 4.2.2 fails to compile with OpenJDK 9.0.4

[Alois Schlögl]

I'm trying to compile Octave 4.2.2 from source

   https://ftp.gnu.org/gnu/octave/octave-4.2.2.tar.xz

with OpenJDK 9.0.4 on Debian 9 (Stretch)/AMD64. OpenJDK 9.0.4 is
wnloaded and from http://jdk.java.net/9/, and the environment variable
JAVA_HOME is set to the corresponding path.

Runing these commands:

   export JAVA_HOME=...
   ./configure --prefix=....
   make

fails for me with this error:

  GEN      scripts/java/org/octave/ClassHelper.class
error: Source option 1.3 is no longer supported. Use 1.6 or later.
error: Target option 1.3 is no longer supported. Use 1.6 or later.
Makefile:27354: recipe for target
'scripts/java/org/octave/ClassHelper.class' failed
make[2]: *** [scripts/java/org/octave/ClassHelper.class] Error 2


I tried also
 ./configure --with-gnu-ld --with-java-homedir="$JAVA_HOME"  --prefix=/
with the same result.


When manually "fixing" the  Makefile with the attached patch, the
compilation will run.


Do you have any suggestions how how to fix this ?



Kind regards,
   Alois

octave-java9.patch
Description: Text Data