package/newlib-bare-metal: add multiple tuple support

Add support to gcc-bare-metal to support multiple architecture tuples
with the BR2_TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH string.

To do this, custom configure, build and install commands are needed, so that
each step goes through a loop of the architecture tuples in the list.

To keep consistency with autotools, all the relevant target configurations
have been copied into the NEWLIB_BARE_METAL_CONF_OPTS while removing any
configurations that do not apply to newlib.

Also, the following configs were not taken because newlib is being built for
each of the bare-metal targets and not the main target of Buildroot.

$$(TARGET_CONFIGURE_OPTS)
$$(TARGET_CONFIGURE_ARGS)
--target=$$(GNU_TARGET_NAME)
--host=$$(GNU_TARGET_NAME)

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

package/newlib-bare-metal/newlib-bare-metal.mk

@@ -22,28 +22,49 @@ NEWLIB_BARE_METAL_INSTALL_STAGING = YES
 NEWLIB_BARE_METAL_INSTALL_TARGET = NO
 NEWLIB_BARE_METAL_MAKE_OPTS = MAKEINFO=true
 
+NEWLIB_BARE_METAL_CONF_OPTS = \
+	--build=$(GNU_HOST_NAME) \
+	--prefix=/usr \
+	--exec-prefix=/usr \
+	--sysconfdir=/etc \
+	--localstatedir=/var \
+	--program-prefix="" \
+	$(if $$($$(PKG)_OVERRIDE_SRCDIR),,--disable-dependency-tracking) \
+	$(QUIET) \
+	--enable-newlib-io-c99-formats \
+	--enable-newlib-io-long-long \
+	--enable-newlib-io-float \
+	--enable-newlib-io-long-double \
+	--disable-multilib \
+	--with-tooldir=/usr
+
 define NEWLIB_BARE_METAL_CONFIGURE_CMDS
-	(cd $(@D) && \
+	$(foreach arch_tuple, $(TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH_TUPLE), \
+		mkdir -p $(@D)/build-$(arch_tuple) && \
+		cd $(@D)/build-$(arch_tuple) && \
 		PATH=$(BR_PATH) \
-		./configure \
-			--target=$(TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH_TUPLE) \
-			--prefix=/usr \
-			--enable-newlib-io-c99-formats \
-			--enable-newlib-io-long-long \
-			--enable-newlib-io-float \
-			--enable-newlib-io-long-double \
-			--disable-multilib \
-			--with-tooldir=/usr \
+		CONFIG_SITE=/dev/null \
+		$(@D)/configure \
+			$(NEWLIB_BARE_METAL_CONF_OPTS) \
+			--target=$(arch_tuple)
 	)
 endef
 
 define NEWLIB_BARE_METAL_BUILD_CMDS
-	PATH=$(BR_PATH) $(MAKE1) $(NEWLIB_BARE_METAL_MAKE_OPTS) -C $(@D)
+	$(foreach arch_tuple, $(TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH_TUPLE), \
+		PATH=$(BR_PATH) $(MAKE1) \
+			$(NEWLIB_BARE_METAL_MAKE_OPTS) \
+			-C $(@D)/build-$(arch_tuple)
+	)
 endef
 
 define NEWLIB_BARE_METAL_INSTALL_STAGING_CMDS
-	PATH=$(BR_PATH) $(MAKE1) -C $(@D) $(NEWLIB_BARE_METAL_MAKE_OPTS) \
-		DESTDIR=$(TOOLCHAIN_BARE_METAL_BUILDROOT_SYSROOT) install
+	$(foreach arch_tuple, $(TOOLCHAIN_BARE_METAL_BUILDROOT_ARCH_TUPLE), \
+		PATH=$(BR_PATH) $(MAKE1) \
+			$(NEWLIB_BARE_METAL_MAKE_OPTS) \
+			-C $(@D)/build-$(arch_tuple) \
+			DESTDIR=$(HOST_DIR)/$(arch_tuple)/sysroot install
+	)
 endef
 
 $(eval $(generic-package))