Running a subset of the libstdc++ testsuite

[Jonathan Wakely]

http://gcc.gnu.org/onlinedocs/libstdc++/test.html#check
says:
 To run a subset of the library tests, try using a command like the
following from the libbuilddir/testsuite directory:
runtest --tool libstdc++ normal.exp="`find $srcdir/17_intro -name *.cc`"

IIRC this doesn't work and hasn't done for quite some time, so should
I update the docs to say something like "make -C testsuite
testsuite_files && $EDITOR testsuite/testsuite_files && make -k check"
instead?

Jon