Please review the below change which adds support for running jtreg
tests from the top level test/ directory using the 'make TESTDIRS=<path>
jtreg_tests' syntax. The TESTDIRS syntax is already used in files like
hotspot/test/Makefile and jdk/test/Makefile and allows for selecting
which jtreg tests to run by providing a directory/path filter. The
change enables doing the same type of invocation from the top level;
something like this:
cd test && make TESTDIRS=../hotspot/test/runtime jtreg_tests
cd test && make TESTDIRS=../jdk/test/javax jtreg_tests
The implementation logic simply extracts the component (hotspot, jdk
etc.) from the value of TESTDIRS and delegates to the respective
component's test/Makefile, removing the ../<component>/test from
TESTDIRS in the process.
Thanks,
Mikael
