Build riscv-gnu-toolchain on Ubuntu for Windows

.gitignore

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+/obj
+/bin
+*.swp

.gitmodules

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+[submodule "src/riscv-gnu-toolchain"]
+	path = src/riscv-gnu-toolchain
+	url = git://github.com/riscv/riscv-gnu-toolchain
+[submodule "src/libexpat"]
+	path = src/libexpat
+	url = git://github.com/libexpat/libexpat

Makefile

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+# The default target
+.PHONY: all
+all:
+
+BINDIR := bin
+OBJDIR := obj
+SRCDIR := src
+
+UBUNTU ?= x86_64-linux-gnu
+WINDOWS ?= i686-w64-mingw32
+
+# FIXME: Detect the native platform
+NATIVE ?= $(UBUNTU)
+
+OBJ_NATIVE := $(OBJDIR)/$(NATIVE)
+OBJ_UBUNTU := $(OBJDIR)/$(UBUNTU)
+OBJ_WIN64  := $(OBJDIR)/$(WINDOWS)
+
+SRC_RGT := $(SRCDIR)/riscv-gnu-toolchain
+SRC_EXPAT := $(SRCDIR)/libexpat/expat
+SRC_ZLIB := $(SRCDIR)/zlib
+
+# The version that will be appended to the various tool builds.
+VERSION ?= $(shell cd $(SRC_RGT); git describe --tags | sed s/^v//g)
+
+# The actual output of this repository is a set of tarballs.
+.PHONY: windows
+windows: $(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-$(WINDOWS).tar.gz
+windows: $(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-$(WINDOWS).src.tar.gz
+.PHONY: ubuntu
+ubuntu: $(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-$(UBUNTU).tar.gz
+ubuntu: $(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-$(UBUNTU).src.tar.gz
+
+# FIXME: Check to see if the Windows tools should be built based on the
+# presence of the Windows cross compiler.
+all: windows
+all: ubuntu
+
+# Some special riscv-gnu-toolchain configure flags for specific targets.
+x86_64-linux-gnu-rgt-configue    :=
+i686-w64-mingw32-rgt-configure   := --without-system-zlib
+
+# There's enough % rules that make starts blowing intermediate files away.
+.SECONDARY:
+
+# Builds riscv-gnu-toolchain for various targets.
+$(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-%.tar.gz: \
+		$(OBJDIR)/%/stamps/riscv-gnu-toolchain/install.stamp
+	$(eval $@_TARGET := $(patsubst $(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-%.tar.gz,%,$@))
+	mkdir -p $(dir $@)
+	tar -C $(OBJDIR)/$($@_TARGET)/install -c riscv64-unknown-elf-gcc-$(VERSION)-$($@_TARGET) | gzip > $(abspath $@)
+
+$(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-%.src.tar.gz: \
+		$(OBJDIR)/%/stamps/riscv-gnu-toolchain/install.stamp
+	$(eval $@_TARGET := $(patsubst $(BINDIR)/riscv64-unknown-elf-gcc-$(VERSION)-%.src.tar.gz,%,$@))
+	mkdir -p $(dir $@)
+	tar -C $(OBJDIR)/$($@_TARGET)/build -c . | gzip > $(abspath $@)
+
+$(OBJDIR)/%/stamps/riscv-gnu-toolchain/install.stamp: \
+		$(OBJDIR)/%/stamps/expat/install.stamp \
+		$(OBJDIR)/%/build/riscv-gnu-toolchain/stamp
+	$(eval $@_TARGET := $(patsubst $(OBJDIR)/%/stamps/riscv-gnu-toolchain/install.stamp,%,$@))
+	$(eval $@_BUILD := $(patsubst %/stamps/riscv-gnu-toolchain/install.stamp,%/build/riscv-gnu-toolchain,$@))
+	$(eval $@_INSTALL := $(patsubst %/stamps/riscv-gnu-toolchain/install.stamp,%/install/riscv64-unknown-elf-gcc-$(VERSION)-$($@_TARGET),$@))
+	mkdir -p $($@_BUILD)
+	cd $($@_BUILD); ./configure --prefix=$(abspath $($@_INSTALL)) --with-host=$($@_TARGET) $($($@_TARGET)-rgt-configure)
+	$(MAKE) PATH="$(abspath $(OBJ_NATIVE)/install/riscv64-unknown-elf-gcc-$(VERSION)-$(NATIVE)/bin:$(PATH))" -C $($@_BUILD)
+	mkdir -p $(dir $@)
+	date > $@
+
+$(OBJDIR)/%/build/riscv-gnu-toolchain/stamp:
+	rm -rf $(dir $@)
+	mkdir -p $(dir $@)
+	cp -r $(SRC_RGT)/* $(dir $@)
+	cd $(dir $@)/riscv-gcc; ./contrib/download_prerequisites
+	date > $@
+
+# The Windows build requires the native toolchain.  The dependency is enforced
+# here, PATH allows the tools to get access.
+$(OBJ_WIN64)/stamps/riscv-gnu-toolchain/install.stamp: \
+	$(OBJ_NATIVE)/stamps/riscv-gnu-toolchain/install.stamp
+
+# OpenOCD requires a GDB that's been build with expat support so it can read
+# the target XML files.
+$(OBJDIR)/%/stamps/expat/install.stamp: \
+		$(OBJDIR)/%/build/expat/configure
+	$(eval $@_TARGET := $(patsubst $(OBJDIR)/%/stamps/expat/install.stamp,%,$@))
+	$(eval $@_BUILD := $(patsubst %/stamps/expat/install.stamp,%/build/expat,$@))
+	$(eval $@_INSTALL := $(patsubst %/stamps/expat/install.stamp,%/install,$@))
+	mkdir -p $($@_BUILD)
+	cd $($@_BUILD); ./configure --prefix=$(abspath $($@_INSTALL)) --host=$($@_TARGET)
+	$(MAKE) -C $($@_BUILD) buildlib
+	$(MAKE) -C $($@_BUILD) installlib
+	mkdir -p $(dir $@)
+	date > $@
+
+$(OBJDIR)/%/build/expat/configure:
+	rm -rf $(dir $@)
+	mkdir -p $(dir $@)
+	cp -r $(SRC_EXPAT)/* $(dir $@)
+	cd $(dir $@); ./buildconf.sh
+	touch -c $@
+
+# Targets that don't build anything
+.PHONY: clean
+clean::
+	rm -rf $(OBJDIR) $(BINDIR)

README.md

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+RISC-V Binary Tools for Embedded Development
+--------
+
+At SiFive we've been distributing binary releases of the embedded development
+tools that target our RISC-V platforms.  This repository contains the scripts
+we use to build these tools.
+
+You should just be able to type "make" and get all the toolchain releases
+supported on the current platform.  Right now this just builds
+riscv-gnu-toolchain for both Windows and Ubuntu, but I plan on adding other
+targets as we perform the first release.
+
+The end-user output is a set of tarballs in "bin" that should be ready to
+upload to a website or deliver to customers.

src/libexpat

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+Subproject commit fbc46fa2be307280648147543c053d05910f7a85

src/riscv-gnu-toolchain

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+Subproject commit f5fae1c27b2365da773816ddcd92f533867f28ec