Re: Running the compat testsuite in "non-mirror" mode

[Eric Botcazou <ebotcazou@libertysurf.fr>]

> I'm sorry, I still don't understand what you mean my mirror and non-mirror
> modes.

OK, sorry for being obtuse.

The compat testsuite is currently automatically run only once, in what I call 
mirror mode, that is the newly built compiler is tested against (an identical 
copy of) itself.  While this is useful for catching problems in the 
argument/return value handling machinery of the back-end, this is only 
moderately useful for compatibility purposes.  Of course this is 
customizable, but only externally (i.e. manually or with an external Makefile 
for example).

What I would like to have is the possibility to automatically run (i.e. with a 
bare make -k check-gcc) the compat testsuite twice, once in the mirror mode 
described above and once in a non-mirror mode.  The latter would mean that 
the newly built compiler is tested against a slight variation of itself, i.e. 
typically with a non-default option, that could have an impact on the calling 
conventions, turned on.  So it would be possible to specify in the compat 
testsuite harness (e.g. a platform-specific driver) that it should be 
automatically run twice on a particular platform, in mirror mode and with an 
hardcoded pair (-mfoo/-mno-foo) of options.

-- 
Eric Botcazou