Langtools javac task target/source from build.properties in 1.11

[Michael Franz]

Hi,

I am building using JDK 1.5 as my default, but configured with JDK 6 (this
is on OS X).  When the langtools section of the build runs I get a Bad
version number in .class file when the custom task 'pcompile' executes.
This is because the classes for the task are compile for JDK 6, but then run
using JDK 5.  The build.properties file has been updated to specify
source/target as 5 (from 6) but these are not passed to the javac that
compiles the tools.  To fix this, either the compilation of the tool needs
to specify the target as 5 or the jvm used to execute the tool needs to be
the same one used for the rest of the build (in this case 6).

The command line calling ant is:
ANT_OPTS=-Djava.io.tmpdir='/Users/mfranz/developer/icedtea/icedtea-1.11-bsd/openjdk-ecj/build/bsd-i586/langtools/build/ant-tmp'
ant -Djdk.version=1.7.0_0 -Dfull.version='1.7.0_0-bsd-b66'
-Drelease=1.7.0_0 -Dbuild.number=b66 -Djavac.debug=true
-Ddebug.classfiles=true -Djavac.target=5 -Djavac.source=5
-Dboot.java.home=/Users/mfranz/developer/icedtea/icedtea-1.11-bsd/bootstrap/jdk1.6.0
-Djavac.executable=/Users/mfranz/developer/icedtea/icedtea-1.11-bsd/bootstrap/jdk1.6.0/bin/javac
-Dbuild.dir=/Users/mfranz/developer/icedtea/icedtea-1.11-bsd/openjdk-ecj/build/bsd-i586/langtools/build
-Ddist.dir=/Users/mfranz/developer/icedtea/icedtea-1.11-bsd/openjdk-ecj/build/bsd-i586/langtools/dist
build

where boot.javac.home is JDK 6.

So, ant is fired up using JDK 5, but the javac tasks run JDK 6.  Is there a
way to run the custom tasks using a forked JVM?

Michael
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