external: Add bootlin cross toolchains

Author: mpe

external/bootlin-toolchains/.gitignore

@@ -0,0 +1,7 @@
+powerpc-440fp--glibc--stable-2024.02-1
+powerpc-e300c3--glibc--stable-2024.02-1
+powerpc-e500mc--glibc--stable-2024.02-1
+powerpc64-e5500--glibc--stable-2024.02-1
+powerpc64-e6500--glibc--stable-2024.02-1
+powerpc64-power8--glibc--stable-2024.02-1
+powerpc64le-power8--glibc--stable-2024.02-1

external/bootlin-toolchains/Makefile

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+host_arch=$(shell uname -m)
+ifeq ($(host_arch),x86_64)
+
+# $1 = arch, $2 = version
+define TEMPLATE =
+$(1)--$(2):
+	rm -f $(1)--$(2).tar.bz2
+	wget --no-verbose https://toolchains.bootlin.com/downloads/releases/toolchains/$(1)/tarballs/$(1)--$(2).tar.bz2
+	tar -xf $(1)--$(2).tar.bz2
+	touch $$@
+	rm -f $(1)--$(2).tar.bz2
+
+ALL_version_$(2) += $(1)--$(2)
+ALL_arch_$(1) += $(1)--$(2)
+ALL_TARGETS += $(1)--$(2)
+endef
+
+ARCHES := powerpc-440fp \
+	powerpc-e300c3 \
+	powerpc-e500mc \
+	powerpc64-e5500 \
+	powerpc64-e6500 \
+	powerpc64-power8 \
+	powerpc64le-power8
+
+VERSIONS := glibc--stable-2024.02-1
+
+DEFAULT := powerpc64-power8--glibc--stable-2024.02-1 powerpc64le-power8--glibc--stable-2024.02-1
+
+help:
+	@echo "bootlin-toolchains"
+	@echo "Available targets:"
+	@echo "  download              # download and unpack toolchains"
+	@echo '  download-all-$$arch    # download all toolchains for arch'
+	@echo '  download-all-$$version # download all toolchains for version'
+	@echo ""
+else
+help:
+	@echo "bootlin-toolchains"
+	@echo "No toolchains available for this architecture"
+endif
+
+
+$(foreach arch,${ARCHES}, \
+	$(foreach version,${VERSIONS}, \
+		$(eval $(call TEMPLATE,${arch},${version})) \
+	) \
+)
+
+$(foreach arch,${ARCHES}, \
+	$(eval download-all-$(arch): $(ALL_arch_$(arch))) \
+)
+
+$(foreach version,${VERSIONS}, \
+	$(eval download-all-$(version): $(ALL_version_$(version))) \
+)
+
+download-all: $(ALL_TARGETS)
+
+CLEAN_DIRS := $(patsubst %,%--*,$(ARCHES))
+
+download: $(DEFAULT)
+
+prepare: download
+
+build:
+
+clean:
+	rm -f *.tar.bz2
+
+distclean: clean
+	rm -rf $(CLEAN_DIRS)
+
+.PHONY: download prepare build clean distclean help