package/glibc: Enable LoongArch64 support

Glibc introduced LoongArch64 support in 2.36, it requires kernel
5.19 to build.

Unselect BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT to reflect we can
build the toolchain.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>

arch/Config.in

@@ -85,7 +85,6 @@ config BR2_loongarch64
 	select BR2_USE_MMU
 	select BR2_ARCH_IS_64
 	select BR2_ARCH_NEEDS_GCC_AT_LEAST_12
-	select BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
 	help
 	  LoongArch64 is 64-bit architecture developed by Loongson.
 	  http://www.loongson.cn/

package/glibc/Config.in

@@ -5,6 +5,7 @@ config BR2_PACKAGE_GLIBC_ARCH_SUPPORTS
 	default y if BR2_aarch64
 	default y if BR2_aarch64_be
 	default y if BR2_i386
+	default y if BR2_loongarch64
 	default y if BR2_m68k_m68k
 	default y if BR2_mips
 	default y if BR2_mipsel
@@ -35,6 +36,7 @@ config BR2_PACKAGE_GLIBC_SUPPORTS
 	# toolchain/toolchain-buildroot/Config.in
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10 || !BR2_powerpc64le
+	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_19 || !BR2_loongarch64
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5 || !BR2_MIPS_NAN_2008
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_4 || !BR2_RISCV_32
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_0 || !BR2_RISCV_64

toolchain/toolchain-buildroot/Config.in

@@ -48,6 +48,10 @@ comment "glibc needs a toolchain w/ kernel headers >= 3.2"
 	depends on BR2_PACKAGE_GLIBC_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 
+comment "glibc on LoongArch64 needs a toolchain w/ headers >= 5.19"
+	depends on BR2_loongarch64
+	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_19
+
 # glibc >= 2.26 require kernel headers >= 3.10 on powerpc64le.
 comment "glibc on powerpc64le needs a toolchain w/ headers >= 3.10"
 	depends on BR2_powerpc64le