On 06/29/2018 07:32 PM, Don Cross wrote:
I wasn't sure whether to send this to lfs-support or lfs-dev. Since
I'm not a developer on LFS, I guessed the former. Apologies if my
guess is unhelpful.
I built LFS using jhalfs and the 8.2 version of the book on a machine
with an Intel G860 processor. The configure script for libffi guessed
wrong about the processor's capabilities, causing Python 3 to crash
with an invalid instruction exception.
I fixed this by changing the jhalfs script 115_libffi to let gcc
determine the architecture rather than the configure script itself:
./configure --prefix=/usr --disable-static --with-gcc-arch=native
See here for reference:
http://linuxfromscratch.org/lfs/view/development/chapter06/libffi.html
I would like to ask that the developers consider making this change to
the LFS book. This might possibly cause incorrect behavior on other
CPU types, although I would think gcc would do a better job than this
buggy script. So at the very least, it would be helpful to mention
this problem and solution on the libffi step (where the problem
originates) and the Python 3 step (where it manifests itself as an
"invalid instruction" exception).
It took me a couple of days to figure this out because I kept thinking
the problem was in Python 3. Now that I know what happened, search
shows that at least one other person has been bitten by this (Celeron
G530 in their case):
I'll think abou this, but perhaps a note inserted may be better. In
some cases, users want to
build on one system and copy it to a lsesser system. Using native may
not be the best fir
that case.
I've created a ticket so we don't forget.
-- Bruce
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