[m-dev.] Running the tests in the Java grade using stage 2

[Zoltan Somogyi]

On Thu, 2 Nov 2017 00:10:59 +0000 (AEDT), Julien Fischer <jfischer at opturion.com> wrote:
> Currently, running the tests at the end of a bootcheck in the java grade falls
> over.  The reason for this is that the tests are run from the stage 2
> compiler's source tree, but the generated wrapper scripts set the CLASSPATH as
> the though compiler had been installed (e.g. the wrapper script is telling the
> JVM to look for the stdlib .jar files in INSTALL_PREFIX/lib etc.).
> 
> I propose that we add a new developer-only environment variable to the
> compiler, MERCURY_STAGE2_WRAPPER_BASE (or something), whose value would be the
> absolute path of the stage 2 directory.  When set, the Mercury compiler would
> generate wrapper scripts that set the CLASSPATH to look for .jars in the stage2
> directories rather than the installation directories.  The bootcheck script
> would (obviously) set this environment variable before running the tests using
> stage 2.
> 
> (I think it is probably easier to maintain the new setting using an environment
> variable rather than a new compiler flag, because various test casese modify
> the set of flags.)

I have no objection.

Zoltan.