Silly question: limiting testsuite runs to specific checks?

[Phil Edwards <phil at jaj dot com>]

I'm still using this hack I posted back in September:

    http://gcc.gnu.org/ml/libstdc++/2001-09/msg00086.html

When I proposed to check this in, Gaby reminded me that dejagnu already
has this feature, documented at

    http://gcc.gnu.org/install/test.html

in the form of passing RUNTESTFLAGS="foo.exp=bar*" to 'make check'.

Fine for the main compiler testsuite, but I've never been able to get
this to work for libstdc++; the syntax just continues to elude me for
target libraries.  Let's say I'm trying to investigate a failure of a
specific test, e.g., 17_intro/headers.cc.  What do I type here?

    % cd objdir/cpu-vendor-os/libstdc++-v3
    % make check RUNTESTFLAGS=" ??? "


Missing something obvious,
Phil

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