Bootstrap broken at the beginning of libstdc++-v3

[Paolo Carlini <pcarlini at suse dot de>]

Hi,

current mainline doesn't bootstrap on at least i686-pc-linux-gnu and 
x86_64-unknown-linux-gnu.

I was afraid to have broken something myself with my recent v3 patches 
(prepared and tested with yesterday's compiler), therefore did a 
toplevel update -D '1 day ago' and then an update -A in libstdc++-v3 and 
the problem went away.

Paolo.

///////////

checking host system type... i686-pc-linux-gnu
checking build system type... i686-pc-linux-gnu
ltcf-cxx.sh: error: problem compiling test program
checking for objdir... .libs
checking for /home/paolo/Gcc/cvs-dirs/gcc-head-build/gcc/xgcc option to 
produce PIC... -fPIC -DPI
C
checking if /home/paolo/Gcc/cvs-dirs/gcc-head-build/gcc/xgcc PIC flag 
-fPIC -DPIC works... yes
checking if /home/paolo/Gcc/cvs-dirs/gcc-head-build/gcc/xgcc static flag 
-static works... yes
finding the maximum length of command line arguments... (cached) 49153
checking if /home/paolo/Gcc/cvs-dirs/gcc-head-build/gcc/xgcc supports -c 
-o file.o... (cached) ye
s
checking if /home/paolo/Gcc/cvs-dirs/gcc-head-build/gcc/xgcc supports 
-fno-rtti -fno-exceptions .
.. yes
checking whether the linker (ld) supports shared libraries...
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking command to parse nm output... ok
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
appending configuration tag "CXX" to libtool
checking for exception model to use... configure: error: unable to 
detect exception model
make[1]: *** [configure-target-libstdc++-v3] Error 1
make[1]: Leaving directory `/home/paolo/Gcc/cvs-dirs/gcc-head-build'
make: *** [bootstrap] Error 2