Re: [RFA] Validate configure script syntax

[Akim Demaille]

 >> if test x"`echo echo yes | sh -n 2>&1`" = x; then
 >> echo ok
 >> else
 >> echo bad;
 >> fi
 >> 
 >> I don't know :)  Sounds OK, but the problem is to catch shells that
 >> loop on checking loops.

 > I see, so you probably need the full infrastructure, or a test in
 > configure.ac as you suggested.  Then you need to run the probe only once,
 > because otherwise it'll wait for two seconds on *every* test (doh!).  Unless
 > you really want to think about a better idea before CVS resurrects, I'll
 > withdraw the patch.

As a first approximation, probing the shell from configure.ac seems
fine.