Compilation for mips-mti-elf fails

[Jeff Johnston]

Hi Marian,

Thanks for the patch.  That directory has a Makefile.am file so it must be
modified and the Makefile.in generated.
I have included a modified version of your patch.  If you have no
objections, I'll check it in.

Regards,

-- Jeff J.


On Thu, Nov 25, 2021 at 4:04 PM Marian Buschsieweke <
marian.buschsieweke@ovgu.de> wrote:

> Hi,
>
> compiling for newlib with GCC 11.2.0 for mips-mti-elf with multilib
> now fails with "Error: unrecognized opcode `cfc1 $3,$31'" while compiling
> newlib/libm/machine/mips/fenv.c
>
> More precisely, newlib/libc/machine/mips/machine/fenv-fp.h included by
> fenv.c
> contains multiple calls of the function line macro __cfc1() which is
> defined in
> newlib/libc/machine/mips/sys/fenv.h as
>
>         #define __cfc1(__fcsr)  __asm __volatile("cfc1 %0, $31" : "=r"
> (__fcsr))
>
> Apparently, this is not compatible with mips16. Adding -mno-mips16 to the
> invocation of the compiler fixes the comiplation. (The same was already
> done for
> cma101.c and cygmon.c in libgloss.)
>
> Attached is a potential fix.
>
> Kind regards,
> Marian
>
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