sysroot and cross-compiler based build WIP

scripts/build_sysroot_gcc.sh

@@ -0,0 +1,150 @@
+#!/usr/bin/env bash
+
+TARGET="x86_64-elf"
+NASM_VERSION="2.14.02"
+GCC_VERSION="7.4.0"
+BINUTILS_VERSION="2.31.1"
+
+SYSROOT=$(realpath "$(dirname $0)/../sysroot")
+WORK=$(realpath "$(dirname $0)/sysroot")
+
+set -e
+mkdir -p "${SYSROOT}"
+mkdir -p "${WORK}"
+
+
+function build_nasm() {
+	if [[ ! -d "${WORK}/nasm-${NASM_VERSION}" ]]; then
+		echo "Downloading NASM..."
+		tarball="nasm-${NASM_VERSION}.tar.gz"
+		curl -sSOL "https://www.nasm.us/pub/nasm/releasebuilds/${NASM_VERSION}/${tarball}"
+		tar xzf "${tarball}" -C "${WORK}" && rm "${tarball}"
+	fi
+
+	mkdir -p "${WORK}/build/nasm"
+	pushd "${WORK}/build/nasm"
+
+	echo "Configuring NASM..."
+	"${WORK}/nasm-${NASM_VERSION}/configure" \
+		--quiet \
+		--config-cache \
+		--disable-werror \
+		--prefix="${SYSROOT}" \
+		--srcdir="${WORK}/nasm-${NASM_VERSION}"
+
+	echo "Building NASM..."
+	(make -j && make install) > "${WORK}/build/nasm_build.log"
+	popd
+}
+
+function build_binutils() {
+	if [[ ! -d "${WORK}/binutils-${BINUTILS_VERSION}" ]]; then
+		echo "Downloading binutils..."
+		tarball="binutils-${BINUTILS_VERSION}.tar.gz"
+		curl -sSOL "https://ftp.gnu.org/gnu/binutils/${tarball}"
+		tar xzf "${tarball}" -C "${WORK}" && rm "${tarball}"
+	fi
+
+	mkdir -p "${WORK}/build/binutils"
+	pushd "${WORK}/build/binutils"
+
+	echo "Configuring binutils..."
+	"${WORK}/binutils-${BINUTILS_VERSION}/configure" \
+		--quiet \
+		--target="${TARGET}" \
+		--prefix="${SYSROOT}" \
+		--with-sysroot \
+		--disable-nls \
+		--disable-werror
+
+	echo "Building binutils..."
+	(make -j && make install) > "${WORK}/build/binutils_build.log"
+	popd
+}
+
+function build_gcc() {
+	if [[ ! -d "${WORK}/gcc-${GCC_VERSION}" ]]; then
+		echo "Downloading GCC..."
+		tarball="gcc-${GCC_VERSION}.tar.gz"
+		curl -sSOL "https://ftp.gnu.org/gnu/gcc/gcc-${GCC_VERSION}/${tarball}"
+		tar xzf "${tarball}" -C "${WORK}" && rm "${tarball}"
+
+		# no-red-zone support version of libgcc
+		echo "MULTILIB_OPTIONS += mno-red-zone" >  "${WORK}/gcc-${GCC_VERSION}/gcc/config/i386/t-${TARGET}"
+		echo "MULTILIB_DIRNAMES += no-red-zone" >> "${WORK}/gcc-${GCC_VERSION}/gcc/config/i386/t-${TARGET}"
+
+cat <<EOF >> "${WORK}/gcc-${GCC_VERSION}/gcc/config.gcc"
+case \${target} in
+	${TARGET})
+		tmake_file="\${tmake_file} i386/t-${TARGET}"
+		;;
+esac
+EOF
+	fi
+
+	mkdir -p "${WORK}/build/gcc"
+	pushd "${WORK}/build/gcc"
+
+	echo "Configuring GCC..."
+	"${WORK}/gcc-${GCC_VERSION}/configure" \
+		--quiet \
+		--target="${TARGET}" \
+		--prefix="${SYSROOT}" \
+		--disable-nls \
+		--enable-languages=c,c++ \
+		--without-headers
+
+	echo "Building GCC..."
+	(make -j all-gcc && make -j all-target-libgcc && make install-gcc && make install-target-libgcc) > "${WORK}/build/gcc_build.log"
+	popd
+}
+
+function build_libstdcxx() {
+	mkdir -p "${WORK}/build/libstdcxx"
+	pushd "${WORK}/build/libstdcxx"
+
+	echo "Configuring libstdc++..."
+	"${WORK}/gcc-${GCC_VERSION}/libstdc++-v3/configure" \
+		--target="${TARGET}" \
+		--prefix="${SYSROOT}" \
+		--disable-nls \
+		--disable-multilib \
+		--with-newlib
+		--disable-libstdcxx-threads
+
+	echo "Building libstdc++..."
+	(make -j && make install) > "${WORK}/build/libstdcxx_build.log"
+	popd
+}
+
+function build_libc() {
+	if [[ ! -d "${WORK}/poplibc" ]]; then
+		echo "Downloading poplibc..."
+		git clone \
+			"https://github.com/justinian/poplibc.git" \
+			"${WORK}/poplibc"
+	else
+		echo "Updating poplibc..."
+		git -C "${WORK}/poplibc" pull
+	fi
+
+	pushd "${WORK}/poplibc"
+	echo "Building poplibc..."
+	make install PREFIX="${SYSROOT}"
+	popd
+}
+
+function update_links() {
+	for exe in `ls "${SYSROOT}/bin/${TARGET}-"*`; do
+		base=$(echo "$exe" | sed -e "s/${TARGET}-//")
+		ln -fs "${exe}" "${base}"
+	done
+}
+
+build_nasm
+build_binutils
+build_gcc
+
+update_links
+export PATH="${SYSROOT}/bin:${PATH}"
+build_libc