[Buildroot] [PATCH 6/7] package/gcc: enable float128 on powerpc64le with glibc >= 2.26 toolchains

[Romain Naour]

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.

Signed-off-by: Romain Naour <romain.naour at gmail.com>
---
 package/gcc/gcc.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

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)$(BR2_powerpc64le),yyy)
+HOST_GCC_COMMON_CONF_OPTS += \
+	--with-long-double-128
+endif
+
 HOST_GCC_COMMON_TOOLCHAIN_WRAPPER_ARGS += -DBR_CROSS_PATH_SUFFIX='".br_real"'
 ifeq ($(BR2_GCC_ARCH_HAS_CONFIGURABLE_DEFAULTS),)
 ifeq ($(call qstrip,$(BR2_GCC_TARGET_CPU_REVISION)),)
-- 
2.9.5