[llvm-dev] Adding minimal target support to build clang

[Bruce Hoult via llvm-dev]

I've been regularly building llvm+clang with -DLLVM_TARGETS_TO_BUILD='' but
a non-empty LLVM_EXPERIMENTAL_TARGETS_TO_BUILD.

On Sun, Aug 19, 2018 at 11:08 PM, Justin Bogner via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> John Paul Adrian Glaubitz via llvm-dev <llvm-dev at lists.llvm.org> writes:
> > Hi!
> >
> > In Debian, we have recently run into the situation that the package
> > qttools-opensource-src has added LLVM's clang parser as a build
> dependency
> > with the effect that the package can no longer be built for a couple of
> > architectures like alpha or ia64 [1].
> >
> > From my current understanding, qttools-opensource-src is merely using the
> > parser part in clang to parse C/C++ code for code analysis which is not
> > necessarily an architecture-specific task.
>
> Building llvm without any backends is supposed to work (and has in the
> past!), but it appears to fail quite a few tests currently. You can try
> this by calling cmake with -DLLVM_TARGETS_TO_BUILD=''. I don't know if
> clang works in that configuration, especially given David's point about
> inline assembly.
>
> > Now, does anyone know whether it would be possible to enable this feature
> > on any given architecture without having to add a full target backend to
> > LLVM? Maybe we could just build an LLVM variant on unsupported targets
> > with the x86 backend enabled (in case it's mandatory to have at least
> > one backend enabled).
> >
> > Thanks,
> > Adrian
> >
> >> [1]
> > https://buildd.debian.org/status/package.php?p=qttools-
> opensource-src&suite=sid
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