linux-kernel - RE: how can we test the hexagon port in mainline

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Date:   Thu, 8 Jul 2021 13:35:49 -0500
From:   "Brian Cain" <bcain@...eaurora.org>
To:     "'Nick Desaulniers'" <ndesaulniers@...gle.com>,
        "'Christoph Hellwig'" <hch@....de>
Cc:     "'Manning, Sid'" <sidneym@...cinc.com>,
        "'Nathan Chancellor'" <nathan@...nel.org>,
        "'Sid Manning'" <sidneym@...eaurora.org>,
        "'Arnd Bergmann'" <arnd@...db.de>, <linux-hexagon@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <clang-built-linux@...glegroups.com>
Subject: RE: how can we test the hexagon port in mainline

> -----Original Message-----
> From: Nick Desaulniers <ndesaulniers@...gle.com>
> Sent: Thursday, July 8, 2021 12:54 PM
> To: Christoph Hellwig <hch@....de>
> Cc: Nathan Chancellor <nathan@...nel.org>; Brian Cain
> <bcain@...eaurora.org>; Sid Manning <sidneym@...eaurora.org>; Arnd
> Bergmann <arnd@...db.de>; linux-hexagon@...r.kernel.org; linux-
> kernel@...r.kernel.org; clang-built-linux@...glegroups.com
> Subject: Re: how can we test the hexagon port in mainline
> 
> On Wed, Jul 7, 2021 at 10:27 PM Christoph Hellwig <hch@....de> wrote:
> >
> > On Wed, Jul 07, 2021 at 10:42:27AM -0700, Nathan Chancellor wrote:
> > >> hch@...ck:~/work/linux$ make -j4 ARCH=hexagon
> > >> CROSS_COMPILE=hexagon-unknown-linux-musl LLVM=1 LLVM_IAS=1
> defconfig all
> > >> HOSTCC  scripts/basic/fixdep
> > >> clang: error while loading shared libraries: libtinfo.so.5: cannot open
> shared object file: No such file or directory
> > >
> > > Hmmm, is that with libtinfo5 installed (or whatever the ncurses-compat
> > > equivalent is on your distribution installed)? I had that problem on Debian
> > > until I insta
> >
> > I did install libtinfo5, which just gets me to the next error:
> >
> > hch@...ck:~/work/linux$ export PATH=/opt/clang+llvm-12.0.0-cross-
> hexagon-unknown-linux-musl/x86_64-linux-gnu/bin/:$PATH
> > hch@...ck:~/work/linux$ make -j4 ARCH=hexagon
> CROSS_COMPILE=hexagon-unknown-linux-musl LLVM=1 LLVM_IAS=1 defconfig
> all
> >   HOSTCC  scripts/basic/fixdep
> > clang: error while loading shared libraries: libc++.so.1: cannot open shared
> object file: No such file or directory
> 
> ^ Nathan did mention earlier in the thread that he "had to install
> libtinfo5 and libc++1-7 on Debian Buster." Emphasis on the _and
> libc++_ part.
> 
> I'm not sure if that binary distribution came with a libc++.so.1; if
> so, that path needs to be specified via LD_LIBRARY_PATH so that the
> runtime loader can find it.  Perhaps rpath wasn't set when the clang
> binary was built.

The only libc++ builds in this distribution are the target hexagon ones.  I did not include a host x86_64 libc++.so library, but it does seem like it would be more convenient if we did.

Nathan suggested disabling the terminfo dependency, I will include that change for the next release that we produce.  Also, the upcoming clang-13 release from releases.llvm.org should contain all the necessary fixes (discussed recently) to build kernel code for hexagon.

> We're looking into statically linked images of clang to prevent these
> kinds of games.

Statically linking against libc++/libc++abi at least seems like a good idea.  Let me know if we can help.

-Brian