toolchain/toolchain-buildroot: enable uclibc for riscv64

We can enable uclibc for RISC-V 64 bit now that it has been
bumped from v1.0.32 to v1.0.34.

Uclibc has had basic support for RISC-V 64 bit since v1.0.31, but
shared library and TLS/NPTL support has only been available since
v1.0.33.

This update has been tested using qemu_riscv64_virt_defconfig and
the Buildroot host QEMU.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/uclibc/Config.in

@@ -101,6 +101,7 @@ config BR2_UCLIBC_TARGET_ARCH
 	default "mips"	   if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
 	default "or1k"     if BR2_or1k
 	default "powerpc"  if BR2_powerpc
+	default "riscv64"  if BR2_RISCV_64
 	default "sh"	   if BR2_sh
 	default "sparc"	   if BR2_sparc
 	default "xtensa"   if BR2_xtensa

toolchain/toolchain-buildroot/Config.in

@@ -27,12 +27,13 @@ choice
 
 config BR2_TOOLCHAIN_BUILDROOT_UCLIBC
 	bool "uClibc-ng"
-	depends on BR2_aarch64 || BR2_aarch64_be || BR2_arcle   || BR2_arceb  || \
-		   BR2_arm     || BR2_armeb    || \
-		   BR2_i386    || BR2_m68k   || BR2_microblaze || \
-		   BR2_mips    || BR2_mipsel || BR2_mips64 || BR2_mips64el || \
-		   BR2_or1k    || BR2_powerpc || BR2_sh2a   || BR2_sh4	   || \
-		   BR2_sh4eb   || BR2_sparc   || BR2_xtensa || BR2_x86_64
+	depends on BR2_aarch64 || BR2_aarch64_be || BR2_arcle      || BR2_arceb    || \
+		   BR2_arm     || BR2_armeb      || \
+		   BR2_i386    || BR2_m68k       || BR2_microblaze || \
+		   BR2_mips    || BR2_mipsel     || BR2_mips64     || BR2_mips64el || \
+		   BR2_or1k    || BR2_powerpc    || BR2_RISCV_64   || \
+		   BR2_sh2a    || BR2_sh4	 || BR2_sh4eb      || BR2_sparc    || \
+		   BR2_xtensa  || BR2_x86_64
 	select BR2_TOOLCHAIN_USES_UCLIBC
 	help
 	  This option selects uClibc-ng as the C library for the