undefined sbrk even with libnosys?

["Marc Schafer" <mschafer at avidyne dot com>]

Using powerpc-eabi-gcc 3.4.0 on a cygwin host with newlib 1.12.0

Link fails due to a missing sbrk:

make[3]: Entering directory
`/cygdrive/g/spaceboy/aClipperDepot/sbir/sins/src/flight/obj/mpc555'
powerpc-eabi-gcc -o ../../sins   exec.o gps.o imu.o kalman.o main.o
matrices.o matrix3.o rotation.o vec.o vg.o  checksum.o sbirMessages.o
sbirSwap.o          -T
../../../../../tools/ram.ld -Wl,-Map,app.map -Wl,--defsym,__cxa_pure_v
irtual=0 -Lc:/avidyne/lib/mpc555  -lmpc555 -lnppBase -lnucleus -lm -lc
 -lgcc -lnosys
/usr/local/ppctools/lib/gcc/powerpc-eabi/3.4.0/../../../../powerpc-eab
i/lib/libc.a(sbrkr.o)(.text+0x40): In function `_sbrk_r':
../../../../../newlib-1.12.0/newlib/libc/reent/sbrkr.c:60: undefined
reference to `sbrk'
collect2: ld returned 1 exit status
make[3]: *** [../../sins] Error 1
make[3]: Leaving directory
`/cygdrive/g/spaceboy/aClipperDepot/sbir/sins/src/flight/obj/mpc555'

As you can see, I am linking with libnosys and nm shows _sbrk.  Is the
underscore my problem?


close.o:
00000000 T close
         U errno

environ.o:
00000000 S __env
00000000 G environ

errno.o:
00000004 C errno

execve.o:
         U errno
00000000 T execve

fork.o:
         U errno
00000000 T fork

fstat.o:
         U errno
00000000 T fstat

getpid.o:
         U errno
00000000 T getpid

gettod.o:
         U errno
00000000 T gettimeofday

isatty.o:
         U errno
00000000 T isatty

kill.o:
         U errno
00000000 T kill

link.o:
         U errno
00000000 T link

lseek.o:
         U errno
00000000 T lseek

open.o:
         U errno
00000000 T open

read.o:
         U errno
00000000 T read

sbrk.o:
00000000 T _sbrk
         U end
00000000 s heap_end.0

stat.o:
         U errno
00000000 T stat

times.o:
         U errno
00000000 T times

unlink.o:
         U errno
00000000 T unlink

wait.o:
         U errno
00000000 T wait

write.o:
         U errno
00000000 T write


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