[cfe-dev] Status of AIX support

[Chris Bowler via cfe-dev]

There are some C++ interoperability issues with getting clang++ to work
with libstdc++.  There are challenges with exception handling
interoperability and static initialization (on which I can elaborate on if
there's interest.)  On AIX, the XLC++ compilers are not interoperable with
g++.  At the moment my team is focused on implementing clang++
interoperability with the XLC++ V16.1 xlclang++ compiler, though we are
trying our best to leave the door open for g++ interoperability as much as
possible.  Feedback on this matter is welcome.

We've been working towards enabling LLVM development for AIX with the
external community.  Currently, there are several OS header updates that
IBM needs to deploy with the OS in order to work correctly with clang.  We
haven't been testing clang against the GNU headers on AIX so far because
our focus has been enabling libc++ on AIX for interoperability with the
XLC++ V16.1 xlclang++ compiler.  I hope to publish a package, which
includes clang binaries for AIX so that everyone has access to a build
compiler for LLVM on AIX.  If an early release of such a package would be
useful to you, please let me know and I'll see if I can cut some red tape
and get you something.  There are some significant limitations to these
compilers.  These include challenges with functional exception handling,
altivec, debug support, and TLS, to name a few, nonetheless, we have been
able to bootstrap LLVM on AIX with some temporary downstream work.

On Sat, Oct 31, 2020 at 8:58 PM Rob Boehne via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> What is the current status of AIX support for clang/clang++ ?  I’m finding
> some targets (needed to actually build software) don’t seem to be
> supported, but I haven’t found any discussion of AIX support.
>
>
>
> Thanks,
>
>
>
> Rob Boehne
>
>
>
>
>
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