[RFC PATCH u-boot 03/12] linker_lists: declare entries and lists externally visible

[Bin Meng]

On Wed, Mar 3, 2021 at 12:13 PM Marek Behún <marek.behun at 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 Behún <marek.behun at nic.cz>
> ---
>  include/linker_lists.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Regards,
Bin