git libffi and gcc

["Matwey V. Kornilov" <matwey dot kornilov at gmail dot com>]

Hello,

I've found that some gcc/libjava issue was fixed in gcc at libffi merge commit.
I would like to bisect exact commit it libffi which fixes this issue.
I am trying to use libffi git with gcc as the following:

cd gcc
rm -rf libffi
git clone https://github.com/libffi/libffi
cd libffi
git checkout needed_commit
sh autogen.sh

But then something is broken inside the build framework after it:

make[2]: Entering directory
'/home/abuild/gcc/obj/armv7hl-suse-linux-gnueabi/libffi'
depbase=`echo src/prep_cif.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
/bin/sh ./libtool  --tag=CC   --mode=compile
/home/abuild/gcc/obj/./gcc/xgcc -B/home/abuild/gcc/obj/./gcc/
-B/usr/armv7hl-suse-linux-gnueabi/bin/
-B/usr/armv7hl-suse-linux-gnueabi/lib/ -isystem
/usr/armv7hl-suse-linux-gnueabi/include -isystem
/usr/armv7hl-suse-linux-gnueabi/sys-include    -DHAVE_CONFIG_H -I.
-I../../../libffi  -I. -I../../../libffi/include -Iinclude
-I../../../libffi/src   -O3 -fomit-frame-pointer -fstrict-aliasing
-ffast-math  -Wall -fexceptions -MT src/prep_cif.lo -MD -MP -MF
$depbase.Tpo -c -o src/prep_cif.lo ../../../libffi/src/prep_cif.c &&\
mv -f $depbase.Tpo $depbase.Plo
mv: cannot stat 'src/.deps/prep_cif.Tpo': No such file or directory
Makefile:1343: recipe for target 'src/prep_cif.lo' failed
make[2]: *** [src/prep_cif.lo] Error 1

So, what is the correct way to regenerate libffi autoconf/automake
stuff for using inside gcc build tree?

-- 
With best regards,
Matwey V. Kornilov
http://blog.matwey.name
xmpp://0x2207@jabber.ru