Route the buiding of libnosys, libpthread through NaClSdkLibrary.

src/untrusted/pthread/nacl.scons

 # -*- python -*-
-# Copyright (c) 2011 The Native Client Authors. All rights reserved.
+# Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 Import('env')
 
 # (elijahtaylor): Removing so braced groups will work for GC syscall wrapping.
 env.FilterOut(CCFLAGS=['-pedantic'])
 
 valgrind = env.ComponentObject(
     'valgrind_annotations.o',
     '${MAIN_DIR}/src/untrusted/valgrind/dynamic_annotations.c')
 
 nc_objs = [env.ComponentObject(module, module + '.c')
            for module in [
                'nc_thread',
                'nc_mutex',
                'nc_condvar',
                'nc_semaphore',
                'nc_token',
                ]
            ] + [valgrind]
 
 # The public library relies on the IRT for crucial system services.
-libpthread = env.ComponentLibrary('libpthread', nc_objs + ['nc_init_irt.c'])
+libpthread = env.NaClSdkLibrary(
+  'libpthread',
+  nc_objs + ['nc_init_irt.c'],
+  # only enable shared versions of this library in the shared newlib case
+  no_shared_lib=not env.Bit('pnacl_shared_newlib'))
 env.AddLibraryToSdk(libpthread)
 
 # The private library rolls in those IRT components.
 nc_private_objs = nc_objs + ['nc_init_private.c'] + [
     env.ComponentObject(
         'irt_%s' % interface,
         '${MAIN_DIR}/src/untrusted/irt/irt_%s.c' % interface)
     for interface in ['mutex', 'cond', 'sem', 'blockhook']
     ]
 
@@ skipping 14 matching lines @@
   # installed, we ensure that they are in place before they're used.
   for compiler in ['${CC}', '${CXX}']:
     # TODO(mcgrathr): This can't be the best way!  Ideally we'd just use
     # '${CC}' directly in env.Depends and that should be fine for scons.
     # But sometimes '${CC}' is not just '.../gcc', it's '.../gcc -m32'.
     compiler = env.subst(compiler).split()[0]
     env.Depends(env.WhereIs(compiler), n)
 else:
   n = []
 env.Alias('install_libpthread', n)