Re: [PATCH] C undefined behavior fix

From: Momchil Velikov (
Date: Wed Jan 02 2002 - 18:28:42 EST

>>>>> "Paul" == Paul Mackerras <> writes:

Paul> Tom Rini writes:

>> Okay, here's a summary of all of the options we have:
>> 1) Change this particular strcpy to a memcpy
>> 2) Add -ffreestanding to the CFLAGS of arch/ppc/kernel/prom.o (If this
>> optimization comes back on with this flag later on, it would be a
>> compiler bug, yes?)
>> 3) Modify the RELOC() marco in such a way that GCC won't attempt to
>> optimize anything which touches it [1]. (Franz, again by Jakub)
>> 4) Introduce a function to do the calculations [2]. (Corey Minyard)
>> 5) 'Properly' set things up so that we don't need the RELOC() macros
>> (-mrelocatable or so?), and forget this mess altogether.

Paul> I would add:

Paul> 6) change strcpy to string_copy so gcc doesn't think it knows what the
Paul> function does

GCC thinks exactly what the function does.

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