RaspberryPI ADA-build causes: undefined reference to `__sync_synchronize'

[Jan Sommer]

Hi,

I managed to build rtems toolchain with ADA support for the raspberry pi, but ran into the following problem when trying to link my first test program:

/opt/rtems-4.11-pi/lib/gcc/arm-rtems4.11/4.9.2/adalib/libgnarl.a(a-retide.o): In function `ada__real_time__delays__delay_until':
/home/taste/rtems-build/build_rtems-4.11-pi/gcc-cross-ada-4.9.2/b-gcc-4.9.2-arm-rtems4.11/gcc/ada/rts/a-retide.adb:60: undefined reference to `__sync_synchronize'
/home/taste/rtems-build/build_rtems-4.11-pi/gcc-cross-ada-4.9.2/b-gcc-4.9.2-arm-rtems4.11/gcc/ada/rts/a-retide.adb:60: undefined reference to `__sync_synchronize'
/opt/rtems-4.11-pi/lib/gcc/arm-rtems4.11/4.9.2/adalib/libgnarl.a(a-sytaco.o): In function `ada__synchronous_task_control__suspend_until_true':
/home/taste/rtems-build/build_rtems-4.11-pi/gcc-cross-ada-4.9.2/b-gcc-4.9.2-arm-rtems4.11/gcc/ada/rts/a-sytaco.adb:95: undefined reference to `__sync_synchronize'
/home/taste/rtems-build/build_rtems-4.11-pi/gcc-cross-ada-4.9.2/b-gcc-4.9.2-arm-rtems4.11/gcc/ada/rts/a-sytaco.adb:95: undefined reference to `__sync_synchronize'
/opt/rtems-4.11-pi/lib/gcc/arm-rtems4.11/4.9.2/adalib/libgnarl.a(s-taprob.o): In function `system__tasking__protected_objects__lock':
/home/taste/rtems-build/build_rtems-4.11-pi/gcc-cross-ada-4.9.2/b-gcc-4.9.2-arm-rtems4.11/gcc/ada/rts/s-taprob.adb:148: undefined reference to `__sync_synchronize'
/opt/rtems-4.11-pi/lib/gcc/arm-rtems4.11/4.9.2/adalib/libgnarl.a(s-taprob.o):/home/taste/rtems-build/build_rtems-4.11-pi/gcc-cross-ada-4.9.2/b-gcc-4.9.2-arm-rtems4.11/gcc/ada/rts/s-taprob.adb:148: more undefined references to `__sync_synchronize' follow
collect2: error: ld returned 1 exit status
arm-rtems4: error when calling /opt/rtems-4.11-pi/bin/arm-rtems4.11-gcc

I found this thread where it seems to have been discussed before, but don't see if and how it was solved: http://gcc.gnu.org/ml/gcc/2012-03/msg00083.html
What would be a starting point to fix this issue?

Best regards,

   Jan