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

[Jan Nieuwenhuizen <janneke@gnu.org>]

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
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