[PATCH 3/3] Build libc-start with stack protector for SHARED

[Florian Weimer]

* Siddhesh Poyarekar via Libc-alpha:

> This does not change the emitted code since __libc_start_main does not
> return, but is important for formal flags compliance.
>
> This also cleans up the cosmetic inconsistency in the stack protector
> flags in csu, especially the incorrect value of STACK_PROTECTOR_LEVEL.
> ---
>  Makeconfig   |  4 ++++
>  csu/Makefile | 22 ++++++++++++----------
>  elf/Makefile |  4 ----
>  3 files changed, 16 insertions(+), 14 deletions(-)
>
> diff --git a/Makeconfig b/Makeconfig
> index 0a4811b5e5..c99464fdfa 100644
> --- a/Makeconfig
> +++ b/Makeconfig
> @@ -856,6 +856,10 @@ ifneq ($(stack-protector),)
>  +stack-protector=$(stack-protector)
>  endif
>  
> +define elide-stack-protector
> +$(if $(filter $(@F),$(patsubst %,%$(1),$(2))), $(no-stack-protector))
> +endef

Please add a comment to this definition, now that it is available
everywhere.  Okay with that change.

Thanks,
Florian