Because of time pressure, the quicksort tests were disabled completely to fix a build failure when using the jdk6 tools (see 7091294 disable quicksort tests). A more targeted fix that avoids the build failure while keeping the tests enabled would be preferable.
I added an 'extern "c"' scope to the call back that is passed to the stdlib:qsort() implementation.
With this change the build passes JPRT even with "-release jdk6".
Attaching the patch (called jdk6-qsfix.diff) to this CR.
The function used for testing together with stdlib::qsort() needs to be declared extern "C".