Exceptions workaround for older systems that don't USE_COLLECT2

[Jason Merrill]

>>>>> Jeffrey A Law <law@cygnus.com> writes:

 >   In message < 199809050209.TAA27108@daisy.css.sfu.ca >you write:
 >> Received wisdom states that you're on a system that doesn't need
 >> to ``USE_COLLECT2'', you should make sure you're running a recent
 >> version of GNU ld if you want exception support to work (at least
 >> if it's using __throw for exceptions).
 >> 
 >> However, under NEXTSTEP 3.3 one can't install a recent GNU ld,
 >> because GNU ld doesn't support NEXTSTEP's object format. But,
 >> because NEXTSTEP's ld is smart enough to grok constructors and
 >> destructors, EGCS 1.1 (and every earlier release) isn't set to
 >> ``USE_COLLECT2''. Net result: while static constructors and
 >> destructors work fine, exceptions don't.

 > Seems to me we ought to enable collect2 on these systems.

Yes, we should.

Jason