GCC 4.7.2 final failing to build with clfs embedded

gcc-fail

make[2]: Entering directory `/opt/clfs/clfs-armv7/sources/gcc-build/gcc'
gawk -f ../../gcc-4.7.3/gcc/opt-functions.awk -f ../../gcc-4.7.3/gcc/opt-read.awk \
       -f ../../gcc-4.7.3/gcc/opth-gen.awk \
       < optionlist > tmp-options.h
/bin/sh ../../gcc-4.7.3/gcc/../move-if-change tmp-options.h options.h
echo timestamp > s-options-h
gcc   -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wc++-compat   -DHAVE_CONFIG_H -DGENERATOR_FILE -Wl,-rpath,/opt/clfs/clfs-armv7/cross-tools/lib -o build/genconstants \
    build/genconstants.o build/read-md.o build/errors.o ../build-x86_64-cross-linux-gnu/libiberty/libiberty.a
build/errors.o: In function `warning':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/errors.c:52: undefined reference to `__fputc_unlocked'
build/errors.o: In function `error':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/errors.c:67: undefined reference to `__fputc_unlocked'
build/errors.o: In function `fatal':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/errors.c:84: undefined reference to `__fputc_unlocked'
build/errors.o: In function `internal_error':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/errors.c:99: undefined reference to `__fputc_unlocked'
build/genconstants.o: In function `print_enum_type':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/genconstants.c:63: undefined reference to `__fputc_unlocked'
build/read-md.o: In function `read_char':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
build/read-md.o: In function `print_c_condition':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.c:226: undefined reference to `__fputc_unlocked'
build/read-md.o: In function `read_char':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
build/read-md.o: In function `fatal_with_file_and_line':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.c:284: undefined reference to `__fputc_unlocked'
build/read-md.o: In function `read_char':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: undefined reference to `__fgetc_unlocked'
build/read-md.o:/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.h:101: more undefined references to `__fgetc_unlocked' follow
build/read-md.o: In function `message_with_line_1':
/opt/clfs/clfs-armv7/sources/gcc-build/gcc/../../gcc-4.7.3/gcc/read-md.c:240: undefined reference to `__fputc_unlocked'
collect2: error: ld returned 1 exit status
make[2]: *** [build/genconstants] Error 1
make[2]: Leaving directory `/opt/clfs/clfs-armv7/sources/gcc-build/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/opt/clfs/clfs-armv7/sources/gcc-build'
make: *** [all] Error 2

One of a few possible reasons for this:

1. I am not using a sane uClibc config
2. Newer uClibc fixes this
3. Somehow host headers are contaminating the build somewhere in GCC or uClibc.
4. fat fingering?

Did you solve the errors? If you solved them, could you help me?How could you do?