possible bug in gcc 3.4.2 on AMD64

I'm trying to build GCC head on a newly installed amd64
FreeBSD system.  In an email exchange on gcc_at_gcc.gnu.org, 
it was suggested that the FreeBSD system compiler may
have a bug.

Consider the following:

cvs -qz9 -d :pserver:anoncvs_at_gcc.gnu.org:/cvs/gcc co gcc
mkdir obj
cd obj
../gcc/configure --enable-languages=c,f95 --prefix=$HOME
gmake bootstrap

This dies in stage1 with

gmake[2]: Entering directory `/home/sgk/obj/gcc'
gcc   -g  -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -fno-common   -DHAVE_CONFIG_H  -o cc1 \
	c-parse.o c-lang.o stub-objc.o attribs.o c-errors.o c-lex.o c-pragma.o c-decl.o c-typeck.o c-convert.o c-aux-info.o c-common.o c-opts.o c-format.o c-semantics.o c-incpath.o cppdefault.o c-ppoutput.o c-cppbuiltin.o prefix.o c-objc-common.o c-dump.o c-pch.o  c-gimplify.o tree-mudflap.o c-pretty-print.o main.o tree-browser.o libbackend.a ../libcpp/libcpp.a ../libcpp/libcpp.a ../libiberty/libiberty.a ./../intl/libintl.a  ../libbanshee/points-to/libandersen.a ../libbanshee/engine/libbansheeengine.a ../libbanshee/libcompat/libbansheecompat.a 
libbackend.a(builtins.o)(.text+0x14018): In function `floor_log2':
../../gcc/gcc/toplev.h:180: undefined reference to `__clzdi2'
libbackend.a(dwarf2out.o)(.text+0x288): In function `floor_log2':
../../gcc/gcc/toplev.h:180: undefined reference to `__clzdi2'
libbackend.a(expmed.o)(.text+0x5c98): In function `floor_log2':
../../gcc/gcc/toplev.h:180: undefined reference to `__clzdi2'
libbackend.a(local-alloc.o)(.text+0x38f8): In function `floor_log2':
../../gcc/gcc/toplev.h:180: undefined reference to `__clzdi2'
libbackend.a(real.o)(.text+0x3138): In function `floor_log2':
../../gcc/gcc/toplev.h:180: undefined reference to `__clzdi2'
libbackend.a(rtlanal.o)(.text+0x87d8):../../gcc/gcc/toplev.h:180: more undefined references to `__clzdi2' follow
gmake[2]: *** [cc1] Error 1
gmake[2]: Leaving directory `/home/sgk/obj/gcc'
gmake[1]: *** [stage1_build] Error 2
gmake[1]: Leaving directory `/home/sgk/obj/gcc'
gmake: *** [bootstrap] Error 2

I was told that __clzdi2 should be a gcc builtin function
and that it should be in libgcc.a.  nm(1) does not reveal
this symbol.

-- 
Steve