[Bug preprocessor/20282] [4.0/4.1 Regression] gcc4 can not bootstrap itself anymore

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-03-04 15:35 -------
(In reply to comment #13)
> The thing that was stopping me from commiting was that I'm now seeing
> FAIL: gcc.dg/cpp/arith-3.c  (test for bogus messages, line 257)
> regression on i386 and x86-64 when starting bootstrap from 20050228
> gcc-4_0-branch.  But I have just verified that this is unrelated to my
> macro.c fix (which doesn't change the code in any way on i386 even),
> but it looks like libgcc.a(expr.o) is miscompiled at -O{2,3,s}.
> So will need to do debugging once again for this, but will commit fix for
> this PR first.

I have been seeing this for a while now.
See <http://gcc.gnu.org/ml/gcc-testresults/2005-03/msg00142.html> for a test results where this 
happens for an unmodified source.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20282