[U-Boot] [PATCH v2] Makefile: Fix linking with modern binutils

[Sjoerd Simons]

Tested on current Debian unstable:
  GNU ld (GNU Binutils for Debian) 2.27.90.20170109

Tested-by: Sjoerd Simons <sjoerd.simons at collabora.co.uk>

On Fri, 2016-12-16 at 15:23 +1030, Joel Stanley wrote:
> Since Binutils 1a9ccd70f9a7[1] u-boot will not link targets that set
> CONFIG_SYS_TEXT_BASE=0 with the following error:
> 
>   LD      u-boot
> arm-linux-gnueabi-ld.bfd: u-boot: Not enough room for program
> headers, try
>  linking with -N
> arm-linux-gnueabi-ld.bfd: final link failed: Bad value
> 
> The issue can reproduced the bad binutils and the rock2_defconfig
> target.
> 
> This issue was also encountered by the powerpc kernel[2], with the
> fix
> being to pass --no-dynamic-linker for linkers newer than 2.26 when
> this
> flag was introduced. The option tells ld that the PIE or shared lib
> does
> not need loaded program headers.
> 
> Ubuntu Zesty's Binutils 2.27.51.20161202 hits this error.
> 
> [1] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit
> ;h=1a9ccd70f9a7
> [2] https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/co
> mmit/?h=next&id=ff45000fcb56b5b0f1a14a865d3541746d838a0a
> 
> Signed-off-by: Joel Stanley <joel at jms.id.au>
> ---
> v2:
>  - use ld-option to test for the flag instead of the version, as
> suggested by Måns
>  - update commit message with clarification from Alan
> 
>  Makefile | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index dfed58bec661..c98a8361654a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -793,6 +793,10 @@ ALL-y += $(CONFIG_BUILD_TARGET:"%"=%)
>  endif
>  
>  LDFLAGS_u-boot += $(LDFLAGS_FINAL)
> +
> +# Avoid 'Not enough room for program headers' error on binutils 2.28
> onwards.
> +LDFLAGS_u-boot += $(call ld-option, --no-dynamic-linker)
> +
>  ifneq ($(CONFIG_SYS_TEXT_BASE),)
>  LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
>  endif
 
-- 
Sjoerd Simons
Collabora Ltd.