gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

Hi!

I'm working on a full source bootstrap for a GNU system, GuixSD in
particular.  With the Mes 0.16 release I thought it was done, but now it
seems I'm stuck.

Using the MesCC C99 compiler written in Guile Scheme, I compiled tcc-0.9.26
and a tiny Mes C library, barely enough to build

    binutils-2.20.1, gcc-2.95.3, and glibc-2.2.5

Using those tools, I built

    binutils-2.20.1, gcc-4.1.0, and glibc-2.3.6

My attempts to build gcc-4.7.4 are failing, the most common error that I
get is

     i386-unknown-linux-gcc --sysroot=/gnu/store/jdjpfzjr2zf3xbf7ssl11ljwpq7spid8-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-stack-protector   -fpic -I. -I. -I../../host-i386-unknown-linux/gcc -I../.././libgcc -I../.././libgcc/. -I../.././libgcc/../gcc -I../.././libgcc/../include  -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../.././libgcc/libgcc2.c 
     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_cmp_return'
     ../.././libgcc/libgcc2.h:162: error: unknown machine mode 'libgcc_shift_count'
     ../.././libgcc/libgcc2.h:372: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__muldi3'
     ../.././libgcc/libgcc2.h:373: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__divdi3'
     ../.././libgcc/libgcc2.h:374: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__udivdi3'
     ../.././libgcc/libgcc2.h:375: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__umoddi3'
     ../.././libgcc/libgcc2.h:376: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__moddi3'
     ...

Gcc-4.7.4 advertises it can be built with gcc-2.95 and binutils-2.13.1
and glibc-2.2.5.

Since mes 0.16 was released two weeks ago I have tried many things, but
not knowing where this error comes makes progress difficult, e.g.: I
didn't manage to compile any glibc > 2.3.6, but that may not be
necessary?

Greetings,
janneke

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[U.Mutlu]

Jan Nieuwenhuizen wrote on 07/09/2018 06:57 PM:
> Hi!
>
> I'm working on a full source bootstrap for a GNU system, GuixSD in
> particular.  With the Mes 0.16 release I thought it was done, but now it
> seems I'm stuck.
>
> Using the MesCC C99 compiler written in Guile Scheme, I compiled tcc-0.9.26
> and a tiny Mes C library, barely enough to build
>
>      binutils-2.20.1, gcc-2.95.3, and glibc-2.2.5
>
> Using those tools, I built
>
>      binutils-2.20.1, gcc-4.1.0, and glibc-2.3.6
>
> My attempts to build gcc-4.7.4 are failing, the most common error that I
> get is
>
>       i386-unknown-linux-gcc --sysroot=/gnu/store/jdjpfzjr2zf3xbf7ssl11ljwpq7spid8-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-stack-protector   -fpic -I. -I. -I../../host-i386-unknown-linux/gcc -I../.././libgcc -I../.././libgcc/. -I../.././libgcc/../gcc -I../.././libgcc/../include  -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../.././libgcc/libgcc2.c
>       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_cmp_return'
>       ../.././libgcc/libgcc2.h:162: error: unknown machine mode 'libgcc_shift_count'
>       ../.././libgcc/libgcc2.h:372: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__muldi3'
>       ../.././libgcc/libgcc2.h:373: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__divdi3'
>       ../.././libgcc/libgcc2.h:374: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__udivdi3'
>       ../.././libgcc/libgcc2.h:375: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__umoddi3'
>       ../.././libgcc/libgcc2.h:376: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__moddi3'
>       ...
>
> Gcc-4.7.4 advertises it can be built with gcc-2.95 and binutils-2.13.1
> and glibc-2.2.5.
>
> Since mes 0.16 was released two weeks ago I have tried many things, but
> not knowing where this error comes makes progress difficult, e.g.: I
> didn't manage to compile any glibc > 2.3.6, but that may not be
> necessary?


What do you get if you grep for "error: " in the xxx/libgcc/config.log under 
the builddir?
It would also be helpful if you could post also your libiberty/config.h

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

[-- Attachment #1: Type: text/plain, Size: 1121 bytes --]

U.Mutlu writes:

> What do you get if you grep for "error: " in the xxx/libgcc/config.log
> under the builddir?

janneke@guix-x86 /tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4$ grep 'error: ' i386-unknown-linux/libgcc/config.log
conftest.c:9:28: error: ac_nonexistent.h: No such file or directory
conftest.c:13: error: size of array 'test_array' is negative
conftest.c:13: error: size of array 'test_array' is negative
conftest.c:13: error: size of array 'test_array' is negative
conftest.c:13: error: size of array 'test_array' is negative
conftest.c:14: error: size of array 'test_array' is negative
conftest.c:14: error: size of array 'test_array' is negative
conftest.c:14: error: size of array 'test_array' is negative
conftest.c:14: error: size of array 'test_array' is negative
conftest.c:14: error: size of array 'test_array' is negative
conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'x'
conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '_Fract'

> It would also be helpful if you could post also your libiberty/config.h

Sure, attached.

janneke


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-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[U.Mutlu]

Jan Nieuwenhuizen wrote on 07/09/2018 09:40 PM:
> U.Mutlu writes:
>
>> What do you get if you grep for "error: " in the xxx/libgcc/config.log
>> under the builddir?
>
> janneke@guix-x86 /tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4$ grep 'error: ' i386-unknown-linux/libgcc/config.log
> conftest.c:9:28: error: ac_nonexistent.h: No such file or directory
> conftest.c:13: error: size of array 'test_array' is negative
> conftest.c:13: error: size of array 'test_array' is negative
> conftest.c:13: error: size of array 'test_array' is negative
> conftest.c:13: error: size of array 'test_array' is negative
> conftest.c:14: error: size of array 'test_array' is negative
> conftest.c:14: error: size of array 'test_array' is negative
> conftest.c:14: error: size of array 'test_array' is negative
> conftest.c:14: error: size of array 'test_array' is negative
> conftest.c:14: error: size of array 'test_array' is negative
> conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'x'
> conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '_Fract'
>
>> It would also be helpful if you could post also your libiberty/config.h
>
> Sure, attached.
>
> janneke


You have attached config.h of 2 targets.
Is just one of them failing, or both?
And of course: are they both using the same target arch, just differing in 
64bit/32bit?

The difference in them is:
diff /tmp/build-i686-pc-linux-gnu--libiberty--config.h 
/tmp/host-i386-unknown-linux--libiberty--config.h |  less -Sn
171c171
< #define HAVE_MMAP 1
---
 > /* #undef HAVE_MMAP */
444c444
< #define STACK_DIRECTION -1
---
 > #define STACK_DIRECTION 0

If they both are the same arch then I would suggest to get the one fixed first 
where the STACK_DIRECTION is seemingly detected wrongly.


And don't use -Werror when compiling, ie. don't treat warnings as error.


And try to find out the reason for the above configure-error:

 > conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__' 
before 'x'
 > conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__' 
before '_Fract'


I forgot to ask: please post also the "error: "'s in libiberty/config.log, ie. 
the grep-output like above.

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Gábor Boskovits]

[-- Attachment #1: Type: text/plain, Size: 2730 bytes --]

U.Mutlu <um@mutluit.com> ezt írta (időpont: 2018. júl. 10., K, 5:53):

> Jan Nieuwenhuizen wrote on 07/09/2018 09:40 PM:
> > U.Mutlu writes:
> >
> >> What do you get if you grep for "error: " in the xxx/libgcc/config.log
> >> under the builddir?
> >
> > janneke@guix-x86 /tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4$
> grep 'error: ' i386-unknown-linux/libgcc/config.log
> > conftest.c:9:28: error: ac_nonexistent.h: No such file or directory
> > conftest.c:13: error: size of array 'test_array' is negative
> > conftest.c:13: error: size of array 'test_array' is negative
> > conftest.c:13: error: size of array 'test_array' is negative
> > conftest.c:13: error: size of array 'test_array' is negative
> > conftest.c:14: error: size of array 'test_array' is negative
> > conftest.c:14: error: size of array 'test_array' is negative
> > conftest.c:14: error: size of array 'test_array' is negative
> > conftest.c:14: error: size of array 'test_array' is negative
> > conftest.c:14: error: size of array 'test_array' is negative
> > conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__'
> before 'x'
> > conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__'
> before '_Fract'
> >
> >> It would also be helpful if you could post also your libiberty/config.h
> >
> > Sure, attached.
> >
> > janneke
>
>
> You have attached config.h of 2 targets.
> Is just one of them failing, or both?
> And of course: are they both using the same target arch, just differing in
> 64bit/32bit?
>
> The difference in them is:
> diff /tmp/build-i686-pc-linux-gnu--libiberty--config.h
> /tmp/host-i386-unknown-linux--libiberty--config.h |  less -Sn
> 171c171
> < #define HAVE_MMAP 1
> ---
>  > /* #undef HAVE_MMAP */
> 444c444
> < #define STACK_DIRECTION -1
> ---
>  > #define STACK_DIRECTION 0
>
> If they both are the same arch then I would suggest to get the one fixed
> first
> where the STACK_DIRECTION is seemingly detected wrongly.
>
>
> And don't use -Werror when compiling, ie. don't treat warnings as error.
>
>
> And try to find out the reason for the above configure-error:
>
>  > conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__'
> before 'x'
>  > conftest.c:11: error: expected '=', ',', ';', 'asm' or '__attribute__'
> before '_Fract'
>
>
> I forgot to ask: please post also the "error: "'s in libiberty/config.log,
> ie.
> the grep-output like above.
>
>
>
>
It seems that the errors you were getting are related to 128 bit floating
point support. It also seems that 128 bit floating point support is enabled
on 64 bits. I'm not sure about the 32 bit case though, do you get the same
error there?

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Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

Gábor Boskovits writes:

> It seems that the errors you were getting are related to 128 bit
> floating point support. It also seems that 128 bit floating point
> support is enabled on 64 bits. I'm not sure about the 32 bit case
> though, do you get the same error there?  

Ah!  That makes me even more supicious... I was wondering about this
command

    i386-unknown-linux-gcc ... -DIN_GCC -o _muldi3.o -c ../.././libgcc/libgcc2.c

this i386-unknown-linux-gcc compiler is the bootstrap compiler,
gcc-4.1.0 (or we may be able to use 2.95.3); is that OK?  Shouldn't the
new `xgcc' compiler be used to compile libgcc2?

janneke

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

Jan Nieuwenhuizen writes:

> Gábor Boskovits writes:
>
>> It seems that the errors you were getting are related to 128 bit
>> floating point support. It also seems that 128 bit floating point
>> support is enabled on 64 bits. I'm not sure about the 32 bit case
>> though, do you get the same error there?  
>
> Ah!  That makes me even more supicious... I was wondering about this
> command
>
>     i386-unknown-linux-gcc ... -DIN_GCC -o _muldi3.o -c ../.././libgcc/libgcc2.c
>
> this i386-unknown-linux-gcc compiler is the bootstrap compiler,
> gcc-4.1.0 (or we may be able to use 2.95.3); is that OK?  Shouldn't the
> new `xgcc' compiler be used to compile libgcc2?

Some great progress!  I found the

    build-i686-pc-linux-gnu
    host-i386-unknown-linux

build directories very suspicous.  I found that in my bootstrap I used
the older `i386-unknown-linux' only because I started with a very early
binutils that didn't know about i686-*linux-gnu yet.

So I have changed the entire bootstrap to use i686-unknown-linux-gnu and
configure gcc-4.7.4 using

    ../build/configure
    --build=i686-unknown-linux-gnu
    --host=i686-unknown-linux-gnu
    --disable-decimal-float
    --disable-libatomic
    --disable-libcilkrts
    --disable-libgomp
    --disable-libitm
    --disable-libmudflap
    --disable-libquadmath
    --disable-libsanitizer
    --disable-libssp
    --disable-libstdcxx-pch
    --disable-libvtv
    --disable-lto
    --disable-lto-plugin
    --disable-multilib
    --disable-plugin
    --disable-shared
    --disable-threads
    --enable-languages=c
    --enable-static
    --prefix=/gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4
    --with-build-sysroot=/gnu/store/ffj8vq5zvm26jhw26fcmz3bjqdx5vfly-glibc-mesboot-2.2.5/include
    --with-native-system-header-dir=/gnu/store/ffj8vq5zvm26jhw26fcmz3bjqdx5vfly-glibc-mesboot-2.2.5/include

Now, building _muldi3.o from libgcc2.c passes, interestingly indeed the
fresh `xgcc' compiler is used now

    /tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4/build/./gcc/xgcc -B/tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4/build/./gcc/ -B/gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/bin/ -B/gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/lib/ -isystem /gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/include -isystem /gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/sys-include --sysroot=/gnu/store/ffj8vq5zvm26jhw26fcmz3bjqdx5vfly-glibc-mesboot-2.2.5/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-stack-protector   -fpic -I. -I. -I../.././gcc -I../../../libgcc -I../../../libgcc/. -I../../../libgcc/../gcc -I../../../libgcc/../include  -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../../../libgcc/libgcc2.c 

no wonder it failed before.

However, now i get this error (I do not have pthreads/pthreads.h).

    /tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4/build/./gcc/xgcc -B/tmp/guix-build-gcc-mesboot-4.7.4.drv-0/gcc-4.7.4/build/./gcc/ -B/gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/bin/ -B/gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/lib/ -isystem /gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/include -isystem /gnu/store/mkhbgqfpj17p2pfpza95y56dlw2fmfj4-gcc-mesboot-4.7.4/i686-unknown-linux-gnu/sys-include --sysroot=/gnu/store/ffj8vq5zvm26jhw26fcmz3bjqdx5vfly-glibc-mesboot-2.2.5/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-stack-protector   -fpic -I. -I. -I../.././gcc -I../../../libgcc -I../../../libgcc/. -I../../../libgcc/../gcc -I../../../libgcc/../include  -DHAVE_CC_TLS  -DUSE_TLS -o generic-morestack-thread.o -MT generic-morestack-thread.o -MD -MP -MF generic-morestack-thread.dep  -c ../../../libgcc/generic-morestack-thread.c 
../../../libgcc/generic-morestack-thread.c:41:21: fatal error: pthread.h: No such file or directory
compilation terminated.
make[3]: *** [../../../libgcc/static-object.mk:17: generic-morestack-thread.o] Error 1

Thanks a lot for listening!

Greetings,
janneke
-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jonathan Wakely]

On Tue, 10 Jul 2018 at 20:51, Jan Nieuwenhuizen wrote:
> However, now i get this error (I do not have pthreads/pthreads.h).

GNU/Linux targets are assumed to have Pthreads (because they should do).

Use --disable-threads or --enable-threads=single to override the default.

SOLVED: Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

U.Mutlu writes:

> Just a tip: you can build the compiler much faster if you use --disable-bootstrap
> (here it reduces the compile time from 111 minutes down to 12 minutes).
> After it's ok, then you can build w/o it to also test the
> bootstrapping.

Thanks!  I'm very grateful for your help.  I succeeded in building
gcc-4.7.4 from almost no binary seeds[0] for GuixSD!

The weird error in Subject was caused by configure+make (and my usage of
configure flags, environment settings) trying to use CC_FOR_BUILD (the
i368-unknow-linux-gcc 2.95.3 compiler) to build libgcc2.c

Here's the configure that I used, which works.

../build/configure\
 --build=i686-unknown-linux-gnu\
 --host=i686-unknown-linux-gnu\
 --with-native-system-header-dir=/gnu/store/lwadx3lm73f8rmy8cvwijrflb9wgcm7j-glibc-mesboot-2.2.5/include\
 --with-build-sysroot=/gnu/store/lwadx3lm73f8rmy8cvwijrflb9wgcm7j-glibc-mesboot-2.2.5/include\
 --prefix=/gnu/store/bci6j4dfrmkfzqbpbbcz5ypk8xmr0j5z-gcc-mesboot-4.7.4\
 --disable-bootstrap\
 --disable-decimal-float\
 --disable-libatomic\
 --disable-libcilkrts\
 --disable-libgomp\
 --disable-libitm\
 --disable-libmudflap\
 --disable-libquadmath\
 --disable-libsanitizer\
 --disable-libssp\
 --disable-libvtv\
 --disable-lto\
 --disable-lto-plugin\
 --disable-multilib\
 --disable-plugin\
 --disable-shared\
 --disable-threads\
 --enable-languages=c\
 --enable-static\
 --enable-threads=single\
 --disable-libstdc__-v3\
 --disable-libstdcxx-pch\
 --disable-build-with-cxx

Greetings,
janneke

[0] http://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/mes.scm?h=wip-bootstrap

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: SOLVED: Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[U.Mutlu]

Jan Nieuwenhuizen wrote on 07/11/2018 07:01 PM:
> U.Mutlu writes:
>
>> Just a tip: you can build the compiler much faster if you use --disable-bootstrap
>> (here it reduces the compile time from 111 minutes down to 12 minutes).
>> After it's ok, then you can build w/o it to also test the
>> bootstrapping.
>
> Thanks!  I'm very grateful for your help.  I succeeded in building
> gcc-4.7.4 from almost no binary seeds[0] for GuixSD!

Congrats!  :-)

Can you give us some info on your project? (mes?)
I think you mentioned TCC, scheme, own header files etc.
Did you still had to use also the old gcc 2.95.3 ?
What's the goal, and why especially that target version gcc 4.7.4 ?
As I could figure out, GuixSD is a (new) GNU package manager, right?
Just a little bit curious about your complicated looking project :-)


> The weird error in Subject was caused by configure+make (and my usage of
> configure flags, environment settings) trying to use CC_FOR_BUILD (the
> i368-unknow-linux-gcc 2.95.3 compiler) to build libgcc2.c
>
> Here's the configure that I used, which works.
>
> ../build/configure\
>   --build=i686-unknown-linux-gnu\
>   --host=i686-unknown-linux-gnu\
>   --with-native-system-header-dir=/gnu/store/lwadx3lm73f8rmy8cvwijrflb9wgcm7j-glibc-mesboot-2.2.5/include\
>   --with-build-sysroot=/gnu/store/lwadx3lm73f8rmy8cvwijrflb9wgcm7j-glibc-mesboot-2.2.5/include\
>   --prefix=/gnu/store/bci6j4dfrmkfzqbpbbcz5ypk8xmr0j5z-gcc-mesboot-4.7.4\
>   --disable-bootstrap\
>   --disable-decimal-float\
>   --disable-libatomic\
>   --disable-libcilkrts\
>   --disable-libgomp\
>   --disable-libitm\
>   --disable-libmudflap\
>   --disable-libquadmath\
>   --disable-libsanitizer\
>   --disable-libssp\
>   --disable-libvtv\
>   --disable-lto\
>   --disable-lto-plugin\
>   --disable-multilib\
>   --disable-plugin\
>   --disable-shared\
>   --disable-threads\
>   --enable-languages=c\
>   --enable-static\
>   --enable-threads=single\
>   --disable-libstdc__-v3\
>   --disable-libstdcxx-pch\
>   --disable-build-with-cxx
>
> Greetings,
> janneke
>
> [0] http://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/mes.scm?h=wip-bootstrap
>

Re: SOLVED: Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

U.Mutlu writes:

>> Thanks!  I'm very grateful for your help.  I succeeded in building
>> gcc-4.7.4 from almost no binary seeds[0] for GuixSD!
>
> Congrats!  :-)

Thanks!

> Can you give us some info on your project? (mes?)

Mes[0] aims to help create full source bootstrapping for GNU/Linux
distributions such as GuixSD[1] as part of the bootstrappable builds[2]
effort.

It consists of a mutual self-hosting Scheme interpreter written in
~5,000LOC of simple C and a Nyacc-based C compiler written in Scheme.

> As I could figure out, GuixSD is a (new) GNU package manager, right?

Correct.  Guix is the packagage manager, GuixSD (for System Distribution) is
GNU's GNU/Linux distribution built around it.

> I think you mentioned TCC, scheme, own header files etc.

This MesCC compiler comes with three sizes of Mes lib C: libc for
building mes.c, libc+tcc for building TCC.  Then, there is libc+gnu that
is used together with TCC to build binutils-2.20a and gcc-2.95.3.

> Did you still had to use also the old gcc 2.95.3 ?

We are using gcc 2.95.3 as the first GCC compiler mainly because (after
many experiments with versions from 1.40 to 4.1) it proved the most
"bootstrappable" GCC.  GCC 3 introduces a dependency on dirent, e.g.,
that our naive C library does not support.

If we make our libc+gnu richer then we can probably target a newer GCC,
but it's not obvious to me what the bootstrap consequences of that are.

> What's the goal, and why especially that target version gcc 4.7.4 ?

GCC 4.7.4 is currently used as one of the bootstrap binaries of GuixSD.
Also, it's the most recent GCC compiler that can be considered to be
directly bootstrappable.  I don't consider building a c++ bootstrap
compiler ;-)

The goal is to replace the x86 bootstrap of GNU/Linux distributions,
using a bootstrap [mostly] from source instead of what currently
happens: seeding it with a very large blob of bootstrap binaries.

GuixSD seems the best place to develop this in.

> Just a little bit curious about your complicated looking project :-)

Thanks for showing interest!

Greetings,
janneke


[0] http://gitlab.com/janneke/mes
[1] https://www.gnu.org/software/guix
[2] http://bootstrappable.org

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Jan Nieuwenhuizen]

U.Mutlu writes:

> You have attached config.h of 2 targets.
> Is just one of them failing, or both?

I hoped to just get one, but I get two; I configure using

    ../build/configure --host=i386-unknown-linux --target=i386-unknown-linux ...

> And of course: are they both using the same target arch, just
> differing in 64bit/32bit?

Not even, this is inside a 32bit VM.  I was hoping to build an x86
toolchain on x86_64, but after these problems I setup a 32bit VM

Maybe I should use

    --host=i686-pc-linux-gnu --target=i686-pc-linux-gnu

?

> The difference in them is:
> diff /tmp/build-i686-pc-linux-gnu--libiberty--config.h
> /tmp/host-i386-unknown-linux--libiberty--config.h |  less -Sn
> 171c171
> < #define HAVE_MMAP 1
> ---
>> /* #undef HAVE_MMAP */
> 444c444
> < #define STACK_DIRECTION -1
> ---
>> #define STACK_DIRECTION 0
>
> If they both are the same arch then I would suggest to get the one
> fixed first where the STACK_DIRECTION is seemingly detected wrongly.

Hmm, this is definitely wrong.

I'll have a look at this first...
janneke

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com

Re: gcc-4.7.4: libgcc2.h:157: error: unable to emulate 'TF'

[Danny Milosavljevic]

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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=/gnu/store/jdjpfzjr2zf3xbf7ssl11ljwpq7spid8-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-stack-protector   -fpic -I. -I. -I../../host-i386-unknown-linux/gcc -I../.././libgcc -I../.././libgcc/. -I../.././libgcc/../gcc -I../.././libgcc/../include  -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../.././libgcc/libgcc2.c 
>      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_cmp_return'
>      ../.././libgcc/libgcc2.h:162: error: unknown machine mode 'libgcc_shift_count'
>      ../.././libgcc/libgcc2.h:372: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__muldi3'
>      ../.././libgcc/libgcc2.h:373: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__divdi3'
>      ../.././libgcc/libgcc2.h:374: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__udivdi3'
>      ../.././libgcc/libgcc2.h:375: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__umoddi3'
>      ../.././libgcc/libgcc2.h:376: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__moddi3'
>      ...
> 
> 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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