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On 11/04/11 12:34, Iyer, Balaji V wrote:
> Hello Everyone, I am getting a bootstrap failure right now when I
> try to build GCC. Here is the output. Can someone please tell me
> how to fix this? Is this something I have modified? I just
> configured using the following command (../gcc/configure
> -prefix=<INSTALL_DIR>). I haven't modified any of the .o files
> mentioned in the error.
Typically a comparison failure means GCC has mis-compiled itself.  You
have to figure out why.

I typically start with a small test which is compiled differently by
the stage1 and stage2 compilers.  Then I figure out where they diverge
in their behavior (say at a pass level).  Then I figure out where they
first diverge at a function within a pass.  That's usually the
function that is being mis-compiled.

Sometimes you can make some educated guesses based recent changes and
comparing how something was compiled before/after the change.

In all these are some of the most annoying bugs to tackle.

jeff
> 
> 
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