PCH now working, should be default?

[law@redhat.com]

In message <200303031953.h23JrLb25348@fillmore.constant.com>, Benjamin Kosnik w
rites:
 >The big win? Well, make check-target-libstdc++-v3 now completes in
 >roughly half the time, with no new failures. Specifically, for me:
 >
 >without pch:
 >2046.929u 160.025s 1:01:38.19 59.6%	0+0k 0+0io 2262556pf+0w
 >
 >with pch:
 >1951.369u 137.396s 37:05.66 93.8%	0+0k 0+0io 1690506pf+0w
 >
 >I'm considering switching this on by default. Thoughts?
Note that it'd probably help the G++ testsuite as well.  

You should have warned folks to look closely at the wall clock time,
not user+system time.

I looked at user + system first and thought "gee, PCH really didn't
help much!" :-)

jeff