From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'
Date: Tue, 10 Jul 2018 17:54:25 +0200
Message-ID: <20180710175425.75df9d04@scratchpost.org>
References: <87sh4sny8j.fsf@gnu.org>
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To: Jan Nieuwenhuizen <janneke@gnu.org>
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Hi Janneke,

On Mon, 09 Jul 2018 18:57:16 +0200
Jan Nieuwenhuizen <janneke@gnu.org> wrote:

>      i386-unknown-linux-gcc --sysroot=3D/gnu/store/jdjpfzjr2zf3xbf7ssl11l=
jwpq7spid8-glibc-mesboot-2.3.6/include   -g -O2 -O2  -g -O2 -DIN_GCC   -W -=
Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -=
Wold-style-definition  -isystem ./include   -fpic -g -DIN_LIBGCC2 -fno-stac=
k-protector   -fpic -I. -I. -I../../host-i386-unknown-linux/gcc -I../.././l=
ibgcc -I../.././libgcc/. -I../.././libgcc/../gcc -I../.././libgcc/../includ=
e  -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.=
dep -DL_muldi3 -c ../.././libgcc/libgcc2.c=20
>      In file included from ../.././libgcc/libgcc2.c:58:
>      ../.././libgcc/libgcc2.h:157: error: unable to emulate 'TF'
>      ../.././libgcc/libgcc2.h:158: error: unable to emulate 'TC'
>      ../.././libgcc/libgcc2.h:161: error: unknown machine mode 'libgcc_cm=
p_return'
>      ../.././libgcc/libgcc2.h:162: error: unknown machine mode 'libgcc_sh=
ift_count'
>      ../.././libgcc/libgcc2.h:372: error: expected '=3D', ',', ';', 'asm'=
 or '__attribute__' before '__muldi3'
>      ../.././libgcc/libgcc2.h:373: error: expected '=3D', ',', ';', 'asm'=
 or '__attribute__' before '__divdi3'
>      ../.././libgcc/libgcc2.h:374: error: expected '=3D', ',', ';', 'asm'=
 or '__attribute__' before '__udivdi3'
>      ../.././libgcc/libgcc2.h:375: error: expected '=3D', ',', ';', 'asm'=
 or '__attribute__' before '__umoddi3'
>      ../.././libgcc/libgcc2.h:376: error: expected '=3D', ',', ';', 'asm'=
 or '__attribute__' before '__moddi3'
>      ...
>=20
> Gcc-4.7.4 advertises it can be built with gcc-2.95 and binutils-2.13.1
> and glibc-2.2.5.

https://gcc.gnu.org/onlinedocs/gccint/Machine-Modes.html

TFmode is for 128 bit floats.

https://gcc.gnu.org/ml/gcc-patches/2008-06/msg01747.html
https://gcc.gnu.org/onlinedocs/gcc-4.8.5/gccint/Type-Layout.html

The softfp emulation is in libgcc.

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