[Bug target/114416] calling convention incompatibility with vendor compiler for V9

["ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114416

--- Comment #18 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #17 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
>> The sparc-sun-solaris2.11 bootstrap (both multilibs) has just completed
>> successfully without regressions.
>> 
>> However, sparc/sol2.h needed an #undef to fix
[...]
> Thanks, fixed.

great, thanks.

>> The sparc64-unknown-linux-gnu one will be running for a couple more
>> hours, though.
>
> The change should be a no-op for this platform.

True.  However, I'd rather wait for the bootstrap to complete.  Should
be sometime tonight...

>> Btw., I thought about running gcc.dg/compat against Studio 12.6 cc.  I'd
>> started trying some time ago, but got distracted.  At the very least, I
>> needed -features=extensions -DSKIP_COMPLEX_INT for a considerable part
>> of that testsuite to compile at all, for the likes of
>> 
>> "/vol/gcc/src/hg/master/local/gcc/testsuite/gcc.dg/compat/pr102024_test.h",
>> line 7: zero-sized struct/union
>> 
>> "/vol/gcc/src/hg/master/local/gcc/testsuite/gcc.dg/compat/struct-layout-1.h",
>> line 197: invalid type combination
>
> I used to do that on a regular basis 20 years ago, which led to:
>   https://gcc.gnu.org/gcc-3.4/sparc-abi.html
> but I lost access to Sun Studio at some point.

FWIW, cfarm216, the new Solaris 11.4/SPARC compile farm host, does have
Studio 12.6 installed.  Right now, it's only the FCS version, but I hope
to get access to the studiosupport repo in the future.  Besides, I've
checked the testcase that prompted this PR with previous Studio versions
quite some time back and their behaviour in this regard is unchanged.