[Buildroot] sparc64 v9 VIS toolchain bug with fzeros?

[Bernhard Fischer]

Hi Blue Swirl,

Configuring gcc with --with-tune=v9 and -mvis in cflags, how can there
be a call to fzeros (a v9a instruction, from the looks)?

Specifically, i see:
/tmp/buildroot_trunk/build_sparc64/staging_dir/usr/bin/sparc64-linux-uclibc-gcc 
-Os -I/tmp/buildroot_trunk/build_sparc64/staging_dir/usr/include
-I/tmp/buildroot_trunk/build_sparc64/staging_dir/include
--sysroot=/tmp/buildroot_trunk/build_sparc64/staging_dir/ -isysroot
/tmp/buildroot_trunk/build_sparc64/staging_dir -mtune=v9 -mvis
-DHAVE_CONFIG_H -I../ncurses -I. -I. -I../include  -D_GNU_SOURCE
-DNDEBUG -O2 -fPIC -c ../ncurses/./tty/lib_mvcur.c -o
../obj_s/lib_mvcur.o
{standard input}: Assembler messages:
{standard input}:12791: Error: Architecture mismatch on "fzeros".
{standard input}:12791:  (Requires v9a|v9b; requested architecture is v9.)
make[2]: *** [../obj_s/lib_mvcur.o] Error 1
make[2]: Leaving directory `/tmp/buildroot_trunk/build_sparc64/ncurses-5.6/ncurses'

Is this a bug in binutils-2.17.50.0.17/gcc-4.2.1 or is my configuration wrong?