[Toybox] Poking at llvm again, now in aosp prebuilts.

[enh]

On Sun, Aug 25, 2019 at 5:30 PM Rob Landley <rob at landley.net> wrote:
>
> I accumulated a lot of open reply windows in the run-up to ELC. :)
>
> On 8/22/19 4:39 PM, enh wrote:
> > remember that clang is always a cross compiler: that compiler builds
> > all the things for all the architectures. you need to tell it to
> > target Android. here it's defaulting to building for what you're
> > running it on.
>
> It gives me another llvm toolchain I can test with. (Which acts basically the
> same as the prebuilt binaries you can download from llvm.org, so not a new
> _category_, but I'm slightly more likely to keep it current.)
>
> > (but you don't want to use the platform prebuilts anyway. use the NDK.
> > and if you want something that acts more like a regular single-target
> > compiler: https://developer.android.com/ndk/guides/standalone_toolchain#building_open_source_projects_using_standalone_toolchains
> > )
>
> I've been using the NDK. And you still don't want an llvm-cc command in the NDK. :(

persuade upstream, and we'll include it too.

> >> (I think I asked this before, but don't remember the answer? Wouldn't it be more
> >> portable to statically link all the prebuilts against bionic instead of
> >> dynamically link them against the host libc? Dynamic library version skew is
> >> common-ish, kernel syscall version skew is quite _uncommon_.
>
> Still dunno why the prebuilts aren't statically linked against bionic.

it's on the to-do list, but not likely to happen any time soon.
there's limited support for "host bionic" in AOSP, but no-one actively
working on it.

> Rob