Hi!

On Wed, 11 Nov 2015 08:59:17 -0500, Nathan Sidwell <nathan@acm.org> wrote:
> On 11/11/15 07:06, Bernd Schmidt wrote:
> > On 11/10/2015 11:33 PM, Nathan Sidwell wrote:
> >> I've been unable to introduce a testcase for this.

(But you still committed an update to gcc/testsuite/ChangeLog.)

You'll need to put such an offloading test into the libgomp testsuite --
offloading complation requires linking, and during that, the offloading
compiler(s) will be invoked, which only the libgomp testsuite is set up
to do, as discussed before.

> >> The difficulty is we
> >> want to check an rtl dump from the acceleration compiler, and there
> >> doesn't  appear to be existing machinery for that in the testsuite.
> >> Perhaps something to be added later?
> >
> > What's the difficulty exactly? Getting a dump should be possible with
> > -foffload=-fdump-whatever, does the testsuite have a problem finding the right
> > filename?

Currently, this will create cc* files, for example ccdjj2z9.o.271r.final
for -foffload=-fdump-rtl-final.  (I don't know if you can come up with
dg-* directives to scan these.)  The reason is -- I think -- because of
the lto-wrapper and/or mkoffloads not specifying a more suitable "base
name" for the temporary input files to lto1.

> That's not the problem.  How to conditionally enable the test is the difficulty. 
>   I suspect porting something concerning accel_compiler from the libgomp 
> testsuite is needed?

Use "{ target openacc_nvidia_accel_selected }", as implemented by
libgomp/testsuite/lib/libgomp.exp:check_effective_target_openacc_nvidia_accel_selected
(already present on trunk).


Grüße
 Thomas