[Buildroot] [PATCH] package/gcc: glibc >= 2.27 needs gcc >= 5 on aarch64

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Sat, 15 Sep 2018 17:54:13 +0200, Romain Naour wrote:
> With the following defconfig:
> BR2_aarch64=y
> BR2_BINUTILS_VERSION_2_28_X=y
> BR2_GCC_VERSION_4_9_X=y
> BR2_TOOLCHAIN_BUILDROOT_CXX=y
> 
> The build fail with this error:
> In file included from ../sysdeps/ieee754/flt-32/math_config.h:23:0,
>                  from ../sysdeps/ieee754/flt-32/e_expf.c:29:
> ../sysdeps/aarch64/fpu/math_private.h: In function 'roundtoint':
> ../sysdeps/aarch64/fpu/math_private.h:311:3: error: implicit declaration of function 'vrndn_f64' [-Werror=implicit-function-declaration]
>    return vget_lane_f64 (vrndn_f64 (vld1_f64 (&x)), 0);
>    ^
> cc1: all warnings being treated as errors
> 
> vrndn_f64 function has been introduced in glibc code since version 2.27 [1].
> So we can't build a glibc based toolchain with gcc 4.9 anymore.
> 
> Add a new dependency in the toolchain infra to avoid selecting
> glibc toolchain using gcc 4.9.
> 
> [1] https://sourceware.org/git/?p=glibc.git;a=commit;h=72aa623345ada1276ed89dbc00fdff9639cb8eaf
> 
> Signed-off-by: Romain Naour <romain.naour@gmail.com>
> Cc: Arnout Vandecappelle <arnout@mind.be>
> ---
>  package/gcc/Config.in.host | 2 ++
>  1 file changed, 2 insertions(+)

Applied to master, thanks.

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com