On Thu, Mar 15, 2007 at 04:11:29PM -0700, Ian Lance Taylor wrote: > "Joseph S. Myers" <[EMAIL PROTECTED]> writes: > > > On Tue, 13 Mar 2007, Mark Mitchell wrote: > > > > > The GCC 4.2.0 RC1 build has failed (on x86_64-unknown-linux-gnu) with: > > > > > > Comparing stages 2 and 3 > > > Bootstrap comparison failure! > > > ./java/parse.o differs > > > ./java/parse-scan.o differs > > > > > > Has anyone else seen this? > > > > I'm now looking at this (or at a possibly related bootstrap comparison > > failure seen on i686-pc-linux-gnu). > > For what it's worth, I bootstrapped on a few different GNU/Linux > systems with different kernels and base compilers. I only saw > bootstrap comparison failures on one; that one was running Red Hat 9 > and had gcc 3.2.2 installed in /usr/bin. On that one, a bootstrap4 > worked. So I assumed that that one was due to some miscompilation of > stage1.
Yes, this has been reported before (I've also seen bootstrap failures when using Red Hat's version 3.2.3 on an x86 RHEL3 box). While we could tell people to use a different compiler to bootstrap, a lot of people will run into this, because there are still a lot of older systems with 3.2.x compilers out there. It might be possible to isolate and work around the failure.
