[PATCH] Add new wa_noexecstack testsuite effective target.

[Rainer Orth]

Hi Martin,

> It's fix for Darwin target and similar others which do
> not support the asembler directive.
>
> Ready for master?

I'm usually all for using effective-target keywords instead of ad-hoc
tests or target lists, but this seems like a single-use case and thus a
bit too much.  Maybe restrict to gas instead?  Or is it possible to
change the test in a way that doesn't depend on special unportable
target assembler options?  I haven't looked admittedly.

If none of this works out:

* Please change the keyword to as_execstack (assuming that an assembler
  supports the positive form support the negative one, too).  "wa"
  doesn't tell me anything...

* This needs documenting in sourcebuild.texi, as always.

So, if there's really no other option: ok with those changes.

> gcc/testsuite/ChangeLog:
>
> 2020-03-16  Martin Liska  <mliska@suse.cz>
>
> 	PR lto/94157
> 	* gcc.dg/lto/pr94157_0.c: Add wa_noexecstack effective
> 	target filter.
> 	* lib/target-supports.exp: Add
> 	check_effective_target_wa_noexecstack.

One question (because I noticed it in several of your patch submissions
lately): do you have a particularly short line length configure for
ChangeLogs or in general?  Many of the lines are way below a 75
character limit, which doesn't improve readablity...

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University