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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114416] calling convention incompatibility with vendor
 compiler for V9
Date: Wed, 24 Apr 2024 12:29:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114416

--- 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.
>=20
> However, sparc/sol2.h needed an #undef to fix
>=20
> In file included from ./tm.h:27,
>                  from /vol/gcc/src/hg/master/local/gcc/gencheck.cc:23:
> /vol/gcc/src/hg/master/local/gcc/config/sparc/sol2.h:460:9: error:
> "SUN_V9_ABI_COMPATIBILITY" redefined [-Werror]
>   460 | #define SUN_V9_ABI_COMPATIBILITY 1
>       |         ^~~~~~~~~~~~~~~~~~~~~~~~
> In file included from ./tm.h:24:
> /vol/gcc/src/hg/master/local/gcc/config/sparc/sparc.h:1705:9: note: this =
is
> the location of the previous definition
>  1705 | #define SUN_V9_ABI_COMPATIBILITY 0
>       |         ^~~~~~~~~~~~~~~~~~~~~~~~

Thanks, fixed.

> 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.

> 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=3Dextensions -DSKIP_COMPLEX_INT for a considerable part
> of that testsuite to compile at all, for the likes of
>=20
> "/vol/gcc/src/hg/master/local/gcc/testsuite/gcc.dg/compat/pr102024_test.h=
",
> line 7: zero-sized struct/union
>=20
> "/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.=