horo(r)logy test fail on solaris (again and solved)

I tried regression test with Postgres Beta and horology test field. See
attached log. It appears few month ago - see
http://archives.postgresql.org/pgsql-ports/2006-06/msg00004.php
I used Sun Studio 11 with -fast flag and SPARC platform.

I played little bit with cc flags and following flags work fine for me:

export CFLAGS="-fast"
export LDFLAGS="-lm -fast"

The fast switch for compiler is very important too, because it links
"fast" library.

Could anybody confirm that it works on his machine?

But the question is if the "-fast" flag is good for postgres. The -fast
flag sets "brutal" floating point optimization and some operation should
have less precision. Is possible verify that floating point operation
works well?

I read postgres documentation about floating point datatypes and that
implementation is platform specific. Developer must take care about it
discrepancies, but should there any other part of postgres code where
"-fast" switch generate some computing defect - it means that result
must be platform independent?

The cc flags are describes in
http://docs.sun.com/source/819-3688/cc_ops.app.html.

Zdenek