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Re: [PATCH v2 3/6] configure: add option to enable LTO

From: Paolo Bonzini
Subject: Re: [PATCH v2 3/6] configure: add option to enable LTO
Date: Mon, 26 Oct 2020 10:51:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1

On 23/10/20 22:06, Daniele Buono wrote:
> This patch allows to compile QEMU with link-time optimization (LTO).
> Compilation with LTO is handled directly by meson. This patch adds checks
> in configure to make sure the toolchain supports LTO.
> Currently, allow LTO only with clang, since I have found a couple of issues
> with gcc-based LTO.
> In case fuzzing is enabled, automatically switch to llvm's linker (lld).
> The standard bfd linker has a bug where function wrapping (used by the fuzz*
> targets) is used in conjunction with LTO.
> Tested with all major versions of clang from 6 to 12
> Signed-off-by: Daniele Buono <dbuono@linux.vnet.ibm.com>

What are the problems like if you have GCC or you ar/linker are not up
to the job?  I wouldn't mind omitting the tests since this has to be
enabled explicitly by the user.


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