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Date: Sat, 25 Aug 2018 00:05:23 +0200
From: Szabolcs Nagy <>
Subject: Re: [PATCH] fix build failure on arm because of missing clz

* Andre McCurdy <> [2018-08-24 14:58:04 -0700]:
> On Fri, Aug 24, 2018 at 12:30 PM, Szabolcs Nagy <> 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?

the asm code in musl does not support thumb1,
but you can compile everything else with thumb1
(the compiler does not pass -mthumb to the assembler
by default so all asm code will be in arm mode)

so with the changed condition the build succeeds
with -mthumb -march=armv5t, but the resulting libc
will not be competely thumb code, i think that's
an improvement.

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