On Wed, Feb 23, 2005 at 12:38:46AM +1100, Paul Hampson wrote: > Why not? Is there something non-deterministic in the compilation > process? > > Ideally, version x of gcc should produce the same output natively > as when cross-compiling. > > Or have I missed something important?
-frandom-seed=string
This option provides a seed that GCC uses when it would otherwise
use random numbers.
At present, this is used to generate certain symbol names that have
to be different in
every compiled file.
The string should be different for every file you compile.
-fno-guess-branch-probability
Do not guess branch probabilities using a randomized model.
Sometimes gcc will opt to use a randomized model to guess branch
probabilities, when
none are available from either profiling feedback (-fprofile-arcs) or
__builtin_expect. This means that different runs of the compiler on
the same program
may produce different object code.
Also, the first 16 bytes will differ in an ELF format .o, see
http://lists.debian.org/debian-devel/2004/09/msg00201.html
--
Petri Latvala
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