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Date: Sat, 29 Jun 2019 00:19:24 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] fix build failure on arm because of missing clz
instruction
On Fri, Jun 28, 2019 at 03:55:56PM -0700, Andre McCurdy wrote:
> On Fri, Aug 24, 2018 at 4:20 PM Rich Felker <dalias@...c.org> wrote:
> > On Fri, Aug 24, 2018 at 02:58:04PM -0700, Andre McCurdy wrote:
> > > On Fri, Aug 24, 2018 at 12:30 PM, Szabolcs Nagy <nsz@...t70.net> wrote:
> > > > another arm patch, clz usage (in fma) was broken with -mthumb -march=armv5t.
> > >
> > > That conditional was originally written under the assumption that musl
> > > doesn't support thumb1 (so -mthumb -march=armv5t is not a supported
> > > configuration).
> > >
> > > Was that assumption wrong?
> >
> > musl does not support being pure-thumb1 code, because some of the asm
> > source files are not thumb-compatible, but I think the C code can be
> > compiled as thumb1. -mthumb is only passed to the assembler for asm
> > source files if __thumb2__ is defined.
>
> Sorry to resurrect such an old thread, but it seems this patch was
> never applied?
>
> Without it, -mthumb -march=armv5t still fails to build due to clz
> getting into C code via inline assembler.
Thanks for reviving this thread. I'll commit it or something similar.
I wonder if _ARM_ARCH>=5 && __thumb__!=1 would be a better test.
Rich
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