From: Stephen Hemminger <stephen@networkplumber.org>
To: Mahdi Rakhshandehroo <mahdi.rakhshandehroo@gmail.com>
Cc: dev@dpdk.org
Subject: Re: [PATCH v2] meson: add support for clang LTO
Date: Wed, 5 Jul 2023 19:55:28 -0700 [thread overview]
Message-ID: <20230705195528.38e57918@hermes.local> (raw)
In-Reply-To: <20220401045435.60172-1-mahdi.rakhshandehroo@gmail.com>
On Thu, 31 Mar 2022 21:54:35 -0700
Mahdi Rakhshandehroo <mahdi.rakhshandehroo@gmail.com> wrote:
> Currently, building DPDK with clang + LTO is unsupported, which is a
> showstopper for cross-language interprocedural optimizations. The root
> cause is that pmdinfogen expects to scan through the section headers of
> generated ELF object files, but clang's "-flto" flag generates LLVM
> bitcode instead. This patch enables LTO builds with clang, provided that
> the linker is set to lld.
>
> The mechanism of action is clang's "-fembed-bitcode" flag, which acts
> similarly to gcc's "-ffat-lto-objects" - the compiler outputs a normal
> ELF object file that keeps pmdinfogen happy, but also embeds IR bitcode
> in a special section of the ELF that lld can then use to construct the
> final binary.
>
> Signed-off-by: Mahdi Rakhshandehroo <mahdi.rakhshandehroo@gmail.com>
> ---
This patch still has several build failures such as Intel compiler.
Please resolve and resubmit
prev parent reply other threads:[~2023-07-06 2:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-01 4:54 Mahdi Rakhshandehroo
2023-07-06 2:55 ` Stephen Hemminger [this message]
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