[releng_6 tinderbox] failure on sparc64/sparc64
Dag-Erling Smørgrav
des at des.no
Sat Feb 4 04:19:48 PST 2006
Warner Losh <imp at bsdimp.com> writes:
> Can we not have special flags for tinderbox builds? It make
> pre-commit testing a big pita. How about just -O on both head and
> in RELENG_6?
As I have repeatedly pointed out in the past, -O2 catches more bugs
because it enables optimizations which require more extensive coverage
analysis.
> The kernel make files have special magic to disable the parts of -O2
> that are known to be bad because tinderbox uses -O2, despite efforts
> in the past to stop the practice.
The kernel has special magic to disable strict aliasing checks because
certain people regularly commit kernel code which violates C aliasing
rules and refuse to fix it. The userland code does not need these
hacks because I spent a lot of time and effort fixing aliasing bugs in
e.g. libalias.
Aliasing violations are not trivial matters; they prevent the compiler
from optimizing code which (for instance) accesses structure members
through pointers to the structure. There is a lot of this in the
kernel.
DES
--
Dag-Erling Smørgrav - des at des.no
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