Ivan Kabaivanov wrote:
> Hi all,
>
> I believe there's a untriggered bug in chapter 6, Re-adjusting the toolchain.
>
> We've just entered the chroot, installed the kernel headers and built glibc.
> At this point we still only have /tools/bin/gcc. We've just built glibc so
> we have it under /lib.
>
> Now we re-adjust the gcc (the /tools gcc, note) specs to use the newly built
> linker.
>
> This is the code:
>
> gcc -dumpspecs | sed \
> -e 's@/tools/lib/ld-linux.so.2@/lib/[EMAIL PROTECTED]' \
> -e '/\*startfile_prefix_spec:/{n;[EMAIL PROTECTED]@/usr/lib/ @}' \
> -e '/\*cpp:/{n;[EMAIL PROTECTED]@ -isystem /usr/[EMAIL PROTECTED]' > \
> `dirname $(gcc --print-libgcc-file-name)`/specs
>
> this expands to /tools/lib/gcc/i686-pc-linux-gnu/4.1.2/specs (LFS-6.3)
>
> So far, so (kinda) good, and still the problem is not triggered.
>
> Then we go on building the rest of Chapter 6. If this is all you ever use
> /tools for, and I'd say about 98% of the people building LFS do just that,
> you're ok.
>
> Now, I remember reading in the book that /tools could be kept in case you
> want to build more instances of LFS. I quickly scanned the LFS-6.3 but
> couldn't find the text. Maybe it was in an older book and has been removed
> since. But this is what we do for ipcop, we pack up /tools for speeding up
> future rebuilds.
>
> Suppose you do want to use /tools to build another LFS and you tar it up
> (just /mnt/lfs/tools, not the rest in /mnt/lfs) and you unpack it on a new
> host and you chroot into it:
>
> So, we should not overwrite the /tools gcc specs in Chapter 6, but keep a
> copy of it in, say, /tools/lib/gcc/i686-pc-linux-gnu/4.1.2/specs-tools and
> rename it back after we build gcc in Chapter 6. Then we can guarantee that
> /tools is self-sufficient. Maybe we should do a pass 2 of the readjustment
> in Chapter 6. This is what I'll do for ipcop, but if you come up with a
> better solution, I'd rather stick with LFS book.
>
> IvanK.
1. The gcc in /tools, built in GCC pass 2, should be linking to /tools
by default anyway, so if you want to re-use /tools after re-adjusting
the toolchain you shouldn't have to do anything with the specs file
other than removing it.
2. The other problem is that the linker has also been modified, so you'd
also have to reverse the commands to switch /tools/bin/ld and ld-new.
3. There is a warning about this in both 6.3 and dev LFS books, on the
"Changing Ownership" page at the end of chapter 5...
http://www.linuxfromscratch.org/lfs/view/development/chapter05/changingowner.html
Caution
If you intend to keep the temporary tools for use in building future LFS
systems, now is the time to back them up. Subsequent commands in chapter
6 will alter the tools currently in place, rendering them useless for
future builds.
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