[Buildroot] [PATCH 1/1] Add support for gold linker and LTO for GCC.

[Baruch Siach <baruch@tkos.co.il>]

Hi Steve,

On Tue, Jun 10, 2014 at 10:13:24PM +0000, Steve Thomas wrote:
> Link Time Optimisations (LTO) from GCC needs the linker plugin. It also
> needs support from the tools, in particular the archiver (AR) to
> properly form archives that can be used by the linker.  The linker needs
> to support the plugin also.
> 
> This patch changes the linker from BFD to GOLD and wraps the ar, nm and
> ranlib utilities with a wrapper that calls the gcc-wrapper version that
> call the actual utilities with an additional argument. This is a
> temporary measure until the GCC versions supoort this properly and saves
> having to modify a few hundres packages.
> 
> Signed-off-by: Steve Thomas <scjthm@live.com>
> ---
>  package/binutils/Config.in.host         |  4 ++++
>  package/binutils/binutils.mk            | 12 +++++++++++
>  package/gcc/4.8.3/950-lto-support.patch | 35 +++++++++++++++++++++++++++++++++
>  package/gcc/4.9.0/950-lto-support.patch | 35 +++++++++++++++++++++++++++++++++
>  package/gcc/Config.in.host              | 19 +++++++++++-------
>  package/gcc/gcc-initial/gcc-initial.mk  | 18 +++++++++++++++++
>  package/gcc/gcc.mk                      | 11 +++++++++++
>  toolchain/toolchain-buildroot/Config.in | 11 +++++++++++
>  8 files changed, 138 insertions(+), 7 deletions(-)
>  create mode 100644 package/gcc/4.8.3/950-lto-support.patch
>  create mode 100644 package/gcc/4.9.0/950-lto-support.patch
> 
> diff --git a/package/binutils/Config.in.host b/package/binutils/Config.in.host
> index 08540a3..a6e5ba6 100644
> --- a/package/binutils/Config.in.host
> +++ b/package/binutils/Config.in.host
> @@ -1,5 +1,8 @@
>  comment "Binutils Options"
>  
> +config BR2_BINUTILS_SUPPORTS_GOLD
> +	bool "binutils 2.24"

Are you sure this needs to be user selectable? The comment string looks 
confusing, anyway.

baruch

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