[Buildroot] [PATCH v3 4/7] package/gcc: enable float128 on powerpc64le with glibc >= 2.26 toolchains

From: Yann E. MORIN <yann.morin.1998@free.fr>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCH v3 4/7] package/gcc: enable float128 on powerpc64le with glibc >= 2.26 toolchains
Date: Wed, 27 Sep 2017 22:40:06 +0200	[thread overview]
Message-ID: <20170927204006.GE2903@scaer> (raw)
In-Reply-To: <20170923212414.16744-5-romain.naour@gmail.com>

Romain, All,

On 2017-09-23 23:24 +0200, Romain Naour spake thusly:
> float128 is now required on powerpc64le with glibc >= 2.26 toolchains.
> 
> Fixes:
> running configure fragment for sysdeps/gnu
> running configure fragment for sysdeps/powerpc/powerpc64le
> checking if [...]powerpc64le-buildroot-linux-gnu-gcc supports binary128 floating point type... no
> checking if the target machine is at least POWER8... yes
> configure: error: ***  binary128 floating point type (GCC >= 6.2) is required on powerpc64le.
> 
> In order to prepare the glibc bump to this version, we enable
> binary128 floating point in gcc. This require at least gcc >= 6.2.
> 
> Disable gcc 4.x and 5.x for internal toolchain.
> 
> Signed-off-by: Romain Naour <romain.naour@gmail.com>

Small nit below...

> ---
> v2: Disable gcc 4.x and 5.x for internal toolchain.
> ---
>  package/gcc/Config.in.host | 4 ++++
>  package/gcc/gcc.mk         | 8 ++++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/package/gcc/Config.in.host b/package/gcc/Config.in.host
> index ec7b692..0926560 100644
> --- a/package/gcc/Config.in.host
> +++ b/package/gcc/Config.in.host
> @@ -39,6 +39,8 @@ config BR2_GCC_VERSION_4_9_X
>  	depends on !(BR2_TOOLCHAIN_USES_MUSL && (BR2_powerpc64 || BR2_powerpc64le))
>  	# musl mips64 unsupported
>  	depends on !(BR2_TOOLCHAIN_USES_MUSL && (BR2_mips64 || BR2_mips64el))
> +	# glibc >= 2.26 needs gcc >= 6.2
> +	depends on !(BR2_TOOLCHAIN_USES_GLIBC && BR2_powerpc64le)
>  	select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
>  
>  config BR2_GCC_VERSION_5_X
> @@ -53,6 +55,8 @@ config BR2_GCC_VERSION_5_X
>  	depends on !BR2_mips_interaptiv && !BR2_mips_m5150 && !BR2_mips_i6400
>  	# musl mips64 unsupported
>  	depends on !(BR2_TOOLCHAIN_USES_MUSL && (BR2_mips64 || BR2_mips64el))
> +	# glibc >= 2.26 needs gcc >= 6.2
> +	depends on !(BR2_TOOLCHAIN_USES_GLIBC && BR2_powerpc64le)
>  	select BR2_TOOLCHAIN_GCC_AT_LEAST_5
>  
>  config BR2_GCC_VERSION_6_X
> diff --git a/package/gcc/gcc.mk b/package/gcc/gcc.mk
> index 49ccccf..54ef70c 100644
> --- a/package/gcc/gcc.mk
> +++ b/package/gcc/gcc.mk
> @@ -254,6 +254,14 @@ HOST_GCC_COMMON_CONF_OPTS += \
>  	--without-long-double-128
>  endif
>  
> +# Since glibc >= 2.26, poerpc64le requires double/long double which
> +# requires at least gcc 6.2.
> +# See sysdeps/powerpc/powerpc64le/configure.ac
> +ifeq ($(BR2_TOOLCHAIN_USES_GLIBC)$(BR2_TOOLCHAIN_GCC_AT_LEAST_6)$(BR2_powerpc64le),yyy)
> +HOST_GCC_COMMON_CONF_OPTS += \
> +	--with-long-double-128

Could very well have been on a single line.

Otherwise:

Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> +endif
> +
>  HOST_GCC_COMMON_TOOLCHAIN_WRAPPER_ARGS += -DBR_CROSS_PATH_SUFFIX='".br_real"'
>  ifeq ($(BR2_GCC_ARCH_HAS_CONFIGURABLE_DEFAULTS),)
>  ifeq ($(call qstrip,$(BR2_GCC_TARGET_CPU_REVISION)),)
> -- 
> 2.9.5
> 
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