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

[Paolo Bonzini]

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.

Paolo