Re: All mips BSPs cannot link psxfenv01

[Mike Frysinger <vapier@gentoo.org>]

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On 15 Jan 2022 15:50, Joel Sherrill wrote:
> I'm forwarding a discussion between Sebastian Huber and myself. Looks like
> the mips fenv.h support was broken recently.
> 
> Any ideas?

i happened to notice the same weirdness when rewriting the autotools logic.
looks like it's due to this patch:
https://sourceware.org/pipermail/newlib/2021/018726.html

i cc-ed you on the thread with a possible fix if you want to give it a try.
-mike

> ---------- Forwarded message ---------
> From: Sebastian Huber <sebastian.huber@embedded-brains.de>
> Date: Sat, Jan 15, 2022, 1:01 PM
> Subject: Re: All mips BSPs cannot link psxfenv01
> To: <joel@rtems.org>
> Cc: RTEMS <devel@rtems.org>
> 
> 
> On 14/01/2022 17:51, Joel Sherrill wrote:
> >> Is this due to the recent Newlib build system changes?
> > I guess so although I don't see anything obvious when I
> > looked at the machine/configure.ac in both versions.
> >
> >   I confirmed jmr3904 could build all tests with this gcc/newlib:
> >
> > $ ~/rtems-work/tools/6/bin/mips-rtems6-gcc --version
> > mips-rtems6-gcc (GCC) 10.3.1 20211214 (RTEMS 6, RSB
> > bb9e049b103f3a47019a6cfad18e2b59c9e9ea97, Newlib eb03ac1)
> >
> > That should have been the immediately previous version.
> 
> It is probably this change:
> 
> commit 8fa73a9f8414a4926365324c2fe32a237c2eb91d
> Author: Jeff Johnston <jjohnstn@redhat.com>
> Date:   Mon Nov 29 17:33:52 2021 -0500
> 
>      Modifying patch from: marian.buschsieweke@ovgu.de
> 
>      The code accessing the floating point control/status register, namely
> 
>              #define __cfc1(__fcsr)  __asm __volatile("cfc1 %0, $31" :
> "=r" (__fcsr)
> 
>      does not compile with mips16. This changed the makefile to pass
> -mno-mips16 to avoid the following
>      compiler error:
> 
>              mips-mti-elf fails with "Error: unrecognized opcode `cfc1
> $3,$31'"
> 
> I have no time to dig into the Newlib build system.
> 
> -- 
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