Hello I am installing Gcc on the second pass but keep receiving this error.checking for C compiler default output file name... a.out
checking whether the C compiler works... configure: error: in `/mnt/lfs/sources/gcc-8.2.0/build/x86_64-pc-linux-gnu/libstdc++-v3':
configure: error: cannot run C compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details.
Makefile:11739: recipe for target 'configure-target-libstdc++-v3' failed
make[1]: *** [configure-target-libstdc++-v3] Error 1
make[1]: Leaving directory '/mnt/lfs/sources/gcc-8.2.0/build'
Makefile:911: recipe for target 'all' failed
make: *** [all] Error 2
I am running a boot-able usb with neon on it. As for the version check these are the results
/bin/sh -> /bin/bash
Binutils: (GNU Binutils) 2.32
bison (GNU Bison) 3.0.4
/usr/bin/yacc -> /usr/bin/bison.yacc
bzip2, Version 1.0.6, 6-Sept-2010.
Coreutils: 8.28
diff (GNU diffutils) 3.6
find (GNU findutils) 4.7.0-git
GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2)
/usr/bin/awk -> /usr/bin/gawk
gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
g++ (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
(GNU libc) 2.29
grep (GNU grep) 3.1
gzip 1.6
Linux version 4.18.0-17-generic (buildd@lgw01-amd64-021) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #18~18.04.1-Ubuntu SMP Fri Mar 15 15:27:12 UTC 2019
m4 (GNU M4) 1.4.18
GNU Make 4.1
GNU patch 2.7.6
Perl version='5.26.1';
Python 3.6.7
sed (GNU sed) 4.4
tar (GNU tar) 1.29
texi2any (GNU texinfo) 6.5
xz (XZ Utils) 5.2.2
g++ compilation OK

I think it's interesting that the error message mentions libstdc++. The last thing you built from this particular tarball was libstdc++. Are you sure you deleted the whole directory (not just the build subdirectory) after that build and started again with freshly unpacked source? You should try doing that now in any case; it will only take a few minutes.

If I were you, I would also (before deleting the directory) look at the last part of config.log as suggested. You might learn more about what went wrong.

In general that's a good procedure to follow with Linux error messages: if they tell you to do a certain thing, then do it.

looking at it is bash pointed to /bin/bash or /bin/sh?

I think bash. I still haven't figured out what Ive done wrong I've rebuilt everything from libstdc++-v3 but haven't figure it out. Anyone have any ideas?

I did as hazel suggested and nothing has changed.

you deleted the whole gcc tarball and made a new build dir and still this error? What happens if you run make clean in that build dir?

I redid the whole build for lfs following the book step by step and received the same error. I tried make clean and same error occurred.

Do the following:

go in config.log and look for the error configure: error: cannot run C compiled programs. lines before that will tell us something.

Please review what you have done (bash history, i.e. as user lfs
'history | less' or just cursor-up to go back (then cursor-down) )
and compare it to the book. Check that you set the environment
variables correctly, then check what you did for each part of the
build. I am thinking you didn't set the environment variable correctly.

Configured with: ../configure --target=x86_64-lfs-linux-gnu --prefix=/tools --with-glib$
Thread model: single
gcc version 8.2.0 (GCC)
configure:4284: $? = 0
configure:4273: x86_64-lfs-linux-gnu-gcc -V >&5
x86_64-lfs-linux-gnu-gcc: error: unrecognized command line option '-V'
x86_64-lfs-linux-gnu-gcc: fatal error: no input files
compilation terminated.
configure:4284: $? = 1
configure:4273: x86_64-lfs-linux-gnu-gcc -qversion >&5
x86_64-lfs-linux-gnu-gcc: error: unrecognized command line option '-qversion'; did you $
x86_64-lfs-linux-gnu-gcc: fatal error: no input files
compilation terminated.
configure:4284: $? = 1
configure:4304: checking for C compiler default output file name
configure:4326: x86_64-lfs-linux-gnu-gcc conftest.c >&5
configure:4330: $? = 0
configure:4367: result: a.out
configure:4383: checking whether the C compiler works
configure:4392: ./a.out
../configure: line 4394: ./a.out: No such file or directory
configure:4396: $? = 127
configure:4403: error: in `/mnt/lfs/sources/gcc-8.2.0/build':
configure:4407: error: cannot run C compiled programs.

Go into the system, and after you get to the point where you type...

su - lfs

type: printenv and post the results here.

So I absolutely gave up. I tried everything under the sun so I tried again. New OS Running fedora 30 and all went well when I got the error gcc pass 2 cannot compute sizeof (long long) any ideas?

you must be missing a step..

what does printenv give you?

I don't know how current this is, but Fedora always used to have a bad reputation as an LFS build host.

I haven’t built LFD in awhile but I think they still have LFS iso you can build from. Another option is to build from JHALFS which is automated. You can pick a package manager from there as well.