Re: [Xen-devel] [PATCH 2/2] tools: detect appropriate debug optimization level

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Doug Goldstein writes ("Re: [PATCH 2/2] tools: detect appropriate debug 
optimization level"):
> On 3/8/16 9:38 AM, Wei Liu wrote:
> > On Mon, Mar 07, 2016 at 08:23:40PM -0600, Doug Goldstein wrote:
> >> The build should not use -O0 as that results in miscompilations. There
> > 
> > This needs some (concrete) references. Is that a known issue in gcc? If
> > so can you reference the bug number?
> 
> So its not really a bug in GCC but just the complete lack of
> optimizations in play. inlines aren't inlined. dead code elimination
> isn't run so things are much bigger. structures aren't padded the same way.

My initial reaction is that I any actual problems are bugs either in
the compiler or in Xen, which should be fixed.

There should be nothing wrong with lack of inlining or dead code
elimination.  If you can give an example of structure padding going
wrong, please do.

Ian.

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