[lfs-support] Please consider adding --with-gcc-arch=native in libffi configure

Bruce Dubbs bruce.dubbs at gmail.com
Tue Jul 3 09:19:49 PDT 2018

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

In the libffi source directory, can you pelease tell us what the output 
of ./config.guess

In my case it is x86_64-unknown-linux-gnu.

   -- Bruce

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