On Jun 24, 2007, at 16:20, Eric Botcazou wrote:
Indeed. It would be interesting to confirm whether or not a copy
of gcc
bootstrapped with a non-gcc compiler matched byte-for-byte with a
copy
of gcc bootstrapped from gcc.
I just made the experiment on an old SPARC/Solaris 2.5.1 machine
and they
differ (cc is Sun C 5.0 and gcc is GCC 3.4.3):
Still, if you use these two bootstrapped, slightly different compilers
as base for a fresh bootstrap in a new build directory, you'll likely
get identical results and that would still prove that there is no
self-propagating back door in GCC on that configuration.
The differences you are seeing now are likely caused by differences in
autoconf configuration for the case of GCC compiler versus non-GCC
compiler.
While these shouldn't propagate to the final binary, it's easy for some
things to slip through. There's no real incentive to work hard to
prevent
that from happening.
-Geert
