[cmake-developers] CTest script and many subprojects

[Wouter Klouwen]

Hi all,

I've been having some success with CTest and am interested in using
CDash as well.

In order to generate some nice output, sub projects seem to be the best
way of presenting the data in CDash for our setup. This setup is perhaps
summed up by having one projects that contains a few hundred projects.
Most of these "sub projects" are normal CMake projects.

Now, in the normal build, we have a `check` target. This is powered by
having tests added with add_test() and this check target invokes CTest
with a script that contains the setting of the SubProject property.

This produces the expected Test.xml with the SubProject tag. When
submitting these to CDash, it produces the right subproject view and the
expected aggregate view.

The next step is that we have code on devices for which we cross compile
and we want to use the same mechanism here in order to execute tests
when installed on our target devices.

Before I started the CDash work, I was able to generate CTest files
which contain the add_test() and set_tests_properties() in order to run
the tests on the devices. This was then invoked with the
DartConfiguration.tcl and ctest -T Test

Perhaps not ideal as it involves generated many CTestTestfile.cmakes,
but this was able to execute the several hundreds of tests with the
appropriate load balancing and produce one giant Test.xml.

In order to switch to generate Test.xml files with SubProject tags this
mechanism needs to be switched to using a CTest script.

As SubProject is a global property, I assume this needs to be unique for
each invocation of ctest_test().
Unfortunately putting multiple ctest_test() calls in one CTest script
seems to result in one Test.xml, which is the last project run. The test
of the output is overwritten.

It seems the only way I can make this work is by having a script which
effectively creates a new CTest script for each subproject, and moves
the produced Test.xml out of the way for the next run.
Is this right?

I hope this all makes sense.

Thanks in advance,
     W
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