Build errors with L4

[Bob Stewart]

I pulled down revisions 56 of l4re per the l4re download instructions on 
an x86 platform running Ubuntu 13.04. I'm cross compiling for an ARM 8 
Beaglebone platform. I created a set of tool links pointing to gcc, g++, 
ar, ld, etc. from the current Genode toolchain. I then followed the l4 
build instructions. The build proceeded normally until is started to 
link in libc static libraries at which point the following errors killed 
the build:
...
make[5]: Entering directory 
`/home/bob/fiasco/builds/l4/pkg/loader/server/src/OBJ-arm_armv7a-l4f'
   ... Compiling main.o
   ... Compiling slab_alloc.o
   ... Compiling region.o
   ... Compiling app_task.o
   ... Compiling name_space.o
   ... Compiling log.o
   ... Compiling global.o
   ... Compiling sched_proxy.o
   ... Compiling alloc.o
   ==> Linking loader
/home/bob/fiasco/builds/l4/lib/arm_armv7a/l4f/libuc_c.a(__exit_handler.o): 
In function `__new_exitfn':
/home/bob/fiasco/builds/l4/pkg/uclibc/lib/uclibc/src/libc/stdlib/_atexit.c:259: 
undefined reference to `__emutls_v.__libc_errno'
/home/bob/fiasco/builds/l4/lib/arm_armv7a/l4f/libuc_c.a(malloc.o): In 
function `malloc':
/home/bob/fiasco/builds/l4/pkg/uclibc/lib/uclibc/src/libc/stdlib/malloc-standard/malloc.c:1018: 
undefined reference to `__emutls_v.__libc_errno'
/home/bob/fiasco/builds/l4/lib/arm_armv7a/l4f/libuc_c.a(fwrite.__DO_UNLOCKED.o): 
In function `fwrite_unlocked':
/home/bob/fiasco/builds/l4/pkg/uclibc/lib/uclibc/src/libc/stdio/fwrite.c:36: 
undefined reference to `__emutls_v.__libc_errno'
/home/bob/fiasco/builds/l4/lib/arm_armv7a/l4f/libuc_c.a(__errno_location.o): 
In function `__errno_location':
/home/bob/fiasco/builds/l4/pkg/uclibc/lib/uclibc/src/libc/misc/internals/__errno_location.c:16: 
undefined reference to `__emutls_v.__libc_errno'
/home/bob/fiasco/builds/l4/pkg/uclibc/lib/uclibc/src/libc/misc/internals/__errno_location.c:16: 
undefined reference to `__emutls_v.__libc_errno'
/home/bob/fiasco/builds/l4/lib/arm_armv7a/l4f/libuc_c.a(_trans2w.o):/home/bob/fiasco/builds/l4/pkg/uclibc/lib/uclibc/src/libc/stdio/_trans2w.c:67: 
more undefined references to `__emutls_v.__libc_errno' follow
make[5]: *** [loader] Error 1

Is there some undocumented compiler flag related to TLS I should be 
setting somewhere to fix these library references?

Thanks you
         Bob Stewart