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Re: [Xen-devel] [PATCH] xen/common: Drop function calls for Xen compile/version information
On 1/18/17 12:04 PM, Andrew Cooper wrote:
> Last time I tried LTO:
>
> * The GCC build did work, but the net binary was bigger rather than
> smaller, and it successfully boot
> * The Clang build worked, made a much smaller binary, but due to a clang
> bug, "optimised" code into using SSE, and blew up spectacularly when
> booting.
>
> From experiments with XTF, Clang 3.9 LTO is far more comprehensive, and
> is basically capable of optimising entire XTF tests into one single test
> function, and properly respects the "no FPU ever" options used during boot.
>
> ~Andrew
FWIW, some of the clang issues I reported against LTO and FPU bits are
marked as fixed in 3.9 and 4.0. Not sure if things got backported.
--
Doug Goldstein
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