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Date: Wed, 13 May 2020 13:49:22 -0500
From: John Arnold <>
To: Rich Felker <>
Cc: Anders Magnusson <>,,
Subject: Re: Re: [Pcc] PCC unable to build musl 1.2.0 (and
 likely earlier)

On Wed, May 13, 2020 at 1:04 PM Rich Felker <> wrote:
> That doesn't sound related. %%ax appearing in the input to the
> assembler would always indicate a bug in either the compiler or the
> inline asm text in the program being compiled.

I did some poking around with pcc -S and it looked like %%ax was only
appearing in the context of the fnstsw instruction, which in pcc's
source only occurs once, in line 329 of arch/i386/local2.c:

expand(p, 0, "\tfnstsw %%ax\n");

My assembly is *really* basic, so I don't know what that means, but
hopefully it's relevant?

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