Defining effective targets in testsuite framework

[François-Xavier Coudert <fxcoudert at gmail dot com>]

Hi all,

I have finished designing a patch for I/O support of large integer and
real kinds in gfortran (hope to submit it for review early next week).
I am now preparing the testcases to go with it. Those testcases will
only have to run on targets matching certain properties (such as
supporting those large kinds). On a unrelated topic (recent /dev/null
failures), Paul Brook suggested I defined an "effective target", with
code to determine whether a given target should or shouldn't belong to
it. I think I must do something like that for my testcases as well.

Given that I don't know much about those things, can someone give me
the basics (or a link pointing to explaining doc) about "effective
targets" in the dejagnu framework. How do I define one, and the use
it? Of course, pointers to examples of this in the existing GCC
codebase would be welcome!

Thanks for your help,
FX