Re: shell function for AS_ERROR

[Eric Blake]

> > I checked that bin/autoconf, tests/testsuite, and configure 
> > all get the correct number and location of as_fn_error definitions (and
> it 
> > wasn't very easy, since I intentionally made the shell function
> definition 
> > dependent on whether logging is in use, so that bin/autoconf's version
> is 
> > lighter-weight than configure's version).
> 
> I appreciate the effort, but is this really necessary?  How much do you
> save?

Oh, how about all of _AS_LINENO_PREPARE (which in turn drags
in _AS_CR_PREPARE, changes as_detect_suggested to a
non-empty string, ...)?  It makes a huge difference to
bin/autoconf - we really _don't_ want to slow down the wrapper
script to re-exec itself with a LINENO-aware shell just to spawn
off a perl script.  Yet that is what happens if as_fn_error blindly
uses _AS_ECHO_LOG rather than waiting until m4_wrap time to
see if a log was actually used.

> ps: I did read the patch. :-)

OK, then I've committed it.

-- 
Eric Blake

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