> It seems that newer gcc (4.8.2) works again (see the Mikael/Mikulas
> thread on "ski" on this mailing list. I also managed to build a kernel
> with gcc 4.8.2 and boot it on my rx2600.
Tony, is GDB working correctly with your gcc 4.8.2-compiled kernel?
Indeed, one noticeable evidence of optimization's breakage is GDB
stopping with SIGTRAP at address 0 as soon as GDB's run command is
executed [1].
Émeric
[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=691576
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