-O2 compiler bug on amd64? (Re: new TCL vs. current-6)

[Kris Kennaway]

On Wed, Dec 08, 2004 at 09:19:47AM -0800, Kris Kennaway wrote:
> On Wed, Dec 08, 2004 at 12:05:38PM -0500, Mikhail Teterin wrote:
> > Three of my TCL-based ports fail now on amd64 running current-6. All failures 
> > occur, when an attempt is made to use the TCL-interpreter -- either to run 
> > the port's self-tests, or to generate the manual pages. The failures are 
> > either "Floating point exceptions" or "Segmentation faults" and appear to 
> > only happen on amd64 (may be, on ia64 as well):
> > 
> > http://people.freebsd.org/~fenner/errorlogs/mi%40aldan.algebra.com.html
> > 
> > Can anyone confirm being able to use freshly built TCL on amd64 _at all_?
> > 
> > My ports did not change in months -- what could be wrong with TCL and/or 
> > amd64?
> 
> Peter speculated a problem when the world is built with -O2 (with or
> without -fno-strict-aliasing).  I haven't been able to confirm this by
> testing with a world built with -O, because I only have one working
> amd64 package builder.

Looks like building the port against an -O world has fixed the
problems.  This suggests a compiler bug with -O2 on amd64.

Kris



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