From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bin Meng <bmeng.cn@gmail.com>
Date: Fri, 5 Mar 2021 11:04:08 +0800
Subject: [RFC PATCH u-boot 03/12] linker_lists: declare entries and lists
 externally visible
In-Reply-To: <20210303041211.26945-4-marek.behun@nic.cz>
References: <20210303041211.26945-1-marek.behun@nic.cz>
 <20210303041211.26945-4-marek.behun@nic.cz>
Message-ID: <CAEUhbmWDCuagNSxi_9f5RyBpy=DMFMeY+FtG4ey4waq38Am9mQ@mail.gmail.com>
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To: u-boot@lists.denx.de

On Wed, Mar 3, 2021 at 12:13 PM Marek Beh?n <marek.behun@nic.cz> wrote:
>
> Use the `__visible` macro to declare entires and lists declared by
> ll_entry_declare() and ll_entry_declare_list() externally visible, so
> that when building with LTO the compiler does not optimize this data
> away.
>

__visible is defined like this:

/*
 * Optional: not supported by clang
 *
 *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-externally_005fvisible-function-attribute
 */
#if __has_attribute(__externally_visible__)
# define __visible                      __attribute__((__externally_visible__))
#else
# define __visible
#endif

It says clang does not support this. So what about clang?

> Signed-off-by: Marek Beh?n <marek.behun@nic.cz>
> ---
>  include/linker_lists.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Regards,
Bin