Re: MIT discovered issue with gcc
On 13Nov27:2356+1100, Scott Ferguson wrote:
> On 27/11/13 23:37, David L. Craig wrote:
> > On 13Nov27:1423+1100, Scott Ferguson wrote:
> >
> >> On 27/11/13 13:49, David L. Craig wrote:
> >
> >>> On 13Nov26:1545-0500, David L. Craig wrote:
> >>>
> >>>> On 13Nov26:1437-0500, Mark Haase wrote:
> >>>>
> >>>>> Therefore, a Linux distribution has 2 choices: (1) wait for upstream
> >>>>> patches for bugs/vulnerabilities as they are found, or (2) recompile all
> >>>>> packages with optimizations disabled. I don't think proposal #2 would get
> >>>>> very far...
> >>>>
> >>>> Well, there's always -O1 as opposed to no optimization.
> >>>> BTW, -O1 is the minimum permitted for making gcc or glibc,
> >>>> I forget which.
> >>>
> >>> I'm rebuilding glibc 2.18 now with -O1 after it refused -O0,
> >>> but binutils 2.23.2, gcc 4.8.1, and g++ 4.8.1 are fine with
> >>> -O0.
> >>
> >> And what was the result of poptck (STACK) when you tested them?
> >
> > I haven't gotten that far yet, and it may be a while, since I want
> > to verify the internal tests and checks first but expect and dejagnu
> > aren't building using the deoptimized binaries (I'm using LFS 7.4
> > stable). So perhaps someone way ahead of me with LLVM/CLANG would
> > like to report on this behavior.
>
> I was hoping you'd do the work for me. (please)
> :)
I'll keep at it but I recommend not holding your breath. Right now
I'm rebuilding using '-O1' for CFLAGS and CXXFLAGS to see if expect
and dejagnu get happy, but I suspect you're really interested in the
-O0 behavior. Is anyone else interested?
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Dave_Craig______________________________________________
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