package/musl: introduce and use BR2_PACKAGE_MUSL_ARCH_SUPPORTS and BR2_PACKAGE_MUSL_SUPPORTS

In this commit BR2_PACKAGE_MUSL_SUPPORTS looks redundant with
BR2_PACKAGE_MUSL_ARCH_SUPPORTS, but for other C libraries, like glibc,
it can be different.

To be consistent, we use the same pattern for musl.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/musl/Config.in

@@ -1,3 +1,31 @@
+config BR2_PACKAGE_MUSL_ARCH_SUPPORTS
+	bool
+	default y if BR2_aarch64
+	default y if BR2_arm
+	default y if BR2_armeb
+	default y if BR2_i386
+	default y if BR2_microblaze
+	default y if BR2_mips
+	default y if BR2_mipsel
+	default y if BR2_mips64
+	default y if BR2_mips64el
+	default y if BR2_or1k
+	default y if BR2_powerpc
+	default y if BR2_powerpc64
+	default y if BR2_powerpc64le
+	default y if BR2_RISCV_64
+	default y if BR2_sh
+	default y if BR2_x86_64
+	depends on !BR2_powerpc_SPE # not supported, build breaks
+	depends on !(BR2_powerpc64 || BR2_powerpc64le) || BR2_POWERPC_CPU_HAS_ALTIVEC
+	# sh2 nommu is supported by musl, but we don't have support
+	# for it in Buildroot.
+	depends on BR2_USE_MMU
+
+config BR2_PACKAGE_MUSL_SUPPORTS
+	bool
+	default y if BR2_PACKAGE_MUSL_ARCH_SUPPORTS
+
 config BR2_PACKAGE_MUSL
 	bool
 	default y

toolchain/toolchain-buildroot/Config.in

@@ -61,15 +61,7 @@ comment "glibc on MIPS w/ NAN2008 needs a toolchain w/ headers >= 4.5"
 
 config BR2_TOOLCHAIN_BUILDROOT_MUSL
 	bool "musl"
-	depends on BR2_aarch64	   || BR2_arm   || BR2_armeb   || BR2_i386 || \
-		   BR2_microblaze  || BR2_mips  || BR2_mipsel  || BR2_mips64 || \
-		   BR2_mips64el    || BR2_or1k  || BR2_powerpc || BR2_powerpc64 || \
-		   BR2_powerpc64le || BR2_RISCV_64 || BR2_sh   || BR2_x86_64
-	depends on !BR2_powerpc_SPE # not supported, build breaks
-	depends on !(BR2_powerpc64 || BR2_powerpc64le) || BR2_POWERPC_CPU_HAS_ALTIVEC
-	# sh2 nommu is supported by musl, but we don't have support
-	# for it in Buildroot.
-	depends on BR2_USE_MMU
+	depends on BR2_PACKAGE_MUSL_SUPPORTS
 	select BR2_TOOLCHAIN_USES_MUSL
 	help
 	  This option selects musl as the C library for the