How do I pass flags to the testsuites?

[Robert Lipe]

>   env CXXFLAGS="-fnew-abi -fno-honor-std" ../configure
> 
> But, I get test failures because those flags are not automatically
> passed to the tests.  Did I do the configure wrong?  How do I manually
> pass these flags to the libio/libstdc++/g++ test suites?  Why don't
> those flags get passed automatically? 

I think you could manually add them with somethig like
make check RUNTESTFLAGS='--target_board=unix{-fnew-abi -fno-honor-std}'

You may have to dork with the quoting.   There should be some prior art
in the archives becuase I do a similar thing to test OpenServer and all
the multilibs.