Hello,

The attached patch allows one to specify an option 'with_pthreads'
when using 'prepare_for_testing' in tests.  One could call
gdb_compile_pthreads directly for such a purpose, but I think using
'prepare_for_testing' is the suggested approach.  If my understanding
or approach is wrong here, then what is the best way to make testcases
to link with pthreads for c++ testcases?

2013-03-23  Siva Chandra Reddy  <sivachandra@google.com>

        Add option to link testcases with Pthreads library when
        using 'prepare_for_testing' in tests.

        testsuite/
        * lib/gdb.exp (build_executable_from_specs): Use
        gdb_compile_pthreads to compile if option "with_pthreads" is
        specified.

Thanks,
Siva Chandra