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Re: [PATCH] livepatch: set -f{function,data}-sections compiler option
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Wed, 2 Mar 2022 15:35:07 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHYLjuyHNmMpGp0pEK3C688krS2saysObiA
- Thread-topic: [PATCH] livepatch: set -f{function,data}-sections compiler option
On 02/03/2022 13:44, Roger Pau Monne wrote:
> diff --git a/xen/common/Kconfig b/xen/common/Kconfig
> index 6443943889..2423d9f490 100644
> --- a/xen/common/Kconfig
> +++ b/xen/common/Kconfig
> @@ -353,7 +353,9 @@ config CRYPTO
> config LIVEPATCH
> bool "Live patching support"
> default X86
> - depends on "$(XEN_HAS_BUILD_ID)" = "y"
> + depends on "$(XEN_HAS_BUILD_ID)" = "y" && \
> + $(cc-option,-ffunction-sections) && \
> + $(cc-option,-fdata-sections)
cc-option can take multiple, so just $(cc-option,-ffunction-sections
-fdata-sections)
However, we in practice want these in combination with $(LD)
--gc-sections anyway although that wants to be separately configurable.
Therefore, we probably want something like:
config FUNC_SECTIONS
bool
config LIVEPATCH
selects FUNC_SECTIONS
or so, so in the future we can add "config LD_GC_SECTIONS" which also
selects FUNC_SECTIONS.
Thoughts?
~Andrew
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