toolchain/toolchain-bare-metal-buildroot: update help text for multiple tuple support

Now that binutils-bare-metal, gcc-bare-metal and newlib-bare-metal packages
have been upgraded to support a list of architecture tuples, this patch
updates the toolchain-bare-metal-buildroot help text to describe the new
capability.

BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH is still backwards compatible with
its prior definition as defining a single tuple with this new definition
works exactly the same as before.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

toolchain/Config.in

@@ -941,7 +941,7 @@ config BR2_TOOLCHAIN_HAS_LIBQUADMATH
 comment "Bare metal toolchain"
 
 config BR2_TOOLCHAIN_BARE_METAL_BUILDROOT
-	bool "Build a bare metal toolchain"
+	bool "Build bare metal toolchains"
 	select BR2_PACKAGE_NEWLIB_BARE_METAL
 	help
 	  Select if you need a bare-metal toolchain for building

toolchain/toolchain-bare-metal-buildroot/Config.in

@@ -1,10 +1,16 @@
 if BR2_TOOLCHAIN_BARE_METAL_BUILDROOT
 
 config BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH
-	string "architecture tuple"
+	string "list of architecture tuples"
 	help
-	  This option allows to define the architecture tuple for the
-	  bare-metal toolchain.
+	  This option allows to define the list of architecture
+	  tuples for which bare-metal toolchains will be created.
+	  One toolchain will be built for each of the architecture
+	  tuples specified in this option.
+
+	  For example, to build both a Microblaze and a RISC-V bare
+	  metal toolchain, use the following definition:
+	  "microblazeel-xilinx-elf riscv32-buldroot-elf"
 
 source "package/newlib-bare-metal/Config.in"
 

toolchain/toolchain-bare-metal-buildroot/toolchain-bare-metal-buildroot.mk

@@ -6,7 +6,6 @@
 
 TOOLCHAIN_BARE_METAL_BUILDROOT_DEPENDENCIES = newlib-bare-metal
 TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH_TUPLE = $(call qstrip,$(BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH))
-TOOLCHAIN_BARE_METAL_BUILDROOT_SYSROOT = $(HOST_DIR)/$(TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH_TUPLE)/sysroot
 TOOLCHAIN_BARE_METAL_BUILDROOT_ADD_TOOLCHAIN_DEPENDENCY = NO
 
 $(eval $(virtual-package))