initial building script

* Try to check dependencies with pacman or apt
* Download and extract archives (supporting gzip and xz)
* Configure and build GCC and binutils (redirecting output to file,
  hoping that everything goes well)
* Clean up uneeded files after building
* Check for conflicting builds of sh-elf-gcc in the PATH
* Offer to update the profile to set the PATH at login

.gitignore

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+# Everything but the scripts
+*
+!fxsdk.make
+!configure.sh
+!build.sh
+!install.sh
+!uninstall.sh
+!.gitignore

build.sh

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+#! /usr/bin/env bash
+
+binutils_version=$1
+gcc_version=$2
+tag="<sh-elf-gcc>"
+root=$(pwd)
+
+run_with_guard() {
+  out="$1"
+  shift 1
+  "$@" >$out 2>&1
+  if [[ "$?" != 0 ]]; then
+    echo "$tag error: build failed, please check $(pwd)/$out o(x_x)o"
+    exit 1
+  fi
+}
+
+# Configure binutils
+
+echo "$tag Configuring binutils..."
+cd build-binutils
+
+run_with_guard fxsdk-configure.log \
+../binutils-$binutils_version/configure --prefix="$root" --target=sh3eb-elf --with-multilib-list=m3,m4-nofpu --program-prefix=sh-elf- --enable-libssp --enable-lto
+
+# Build binutils
+
+echo "$tag Compiling binutils (can take a couple of minutes)..."
+
+run_with_guard fxsdk-build.log \
+make -j$(nproc)
+
+run_with_guard fxsdk-install.log \
+make install
+
+cd ..
+
+# Configure GCC
+
+echo "$tag Configuring gcc..."
+cd build-gcc
+
+run_with_guard fxsdk-configure.log \
+../gcc-$gcc_version/configure --prefix="$root" --target=sh3eb-elf --with-multilib-list=m3,m4-nofpu --enable-languages=c,c++ --without-headers --with-newlib --program-prefix=sh-elf- --enable-libssp --enable-lto
+
+# Build GCC
+
+echo "$tag Compiling gcc (often takes 10-20 minutes)..."
+
+run_with_guard fxsdk-build.log \
+make -j$(nproc) all-gcc all-target-libgcc
+
+run_with_guard fxsdk-install.log \
+make install-gcc install-target-libgcc
+
+cd ..
+
+# Cleaning up everything
+
+echo "$tag Cleaning up..."
+
+rm -rf binutils-$binutils_version/ build-binutils/
+rm -rf gcc-$gcc_version/ build-gcc

configure.sh

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+#! /usr/bin/env bash
+
+binutils_version=$1
+gcc_version=$2
+tag="<sh-elf-gcc>"
+
+has() {
+  which $1 >/dev/null 2>&1
+}
+pacman_has() {
+  pacman -Qi $1 >/dev/null 2>&1
+}
+apt_has() {
+  apt show $1 >/dev/null 2>&1
+}
+
+download() {
+  url=$1
+  out=$2
+
+  if [ -f "$out" ]; then
+    echo "$tag Found $out in current directory, skipping download"
+    return
+  fi
+
+  echo "$tag Downloading $url..."
+
+  if has curl; then
+    curl $url -o $out
+  elif has wget; then
+    wget -q --show-progress $url -O $out
+  else
+    echo "$tag error: no curl or wget; install one or download archives yourself" >&2
+    return 1
+  fi
+}
+
+# Check dependencies
+
+if has pacman; then
+  deps="mpfr mpc gmp libpng ppl flex gcc git texinfo"
+  pm=pacman
+  pm_has=pacman_has
+  install_cmd="sudo pacman -S"
+elif has apt; then
+  deps="libmpfr-dev libmpc-dev libgmp-dev libpng-dev libppl-dev flex g++ git texinfo"
+  pm=apt
+  pm_has=apt_has
+  install_cmd="sudo apt install"
+else
+  trust_deps=1
+fi
+
+missing=""
+if [[ -z "$trust_deps" ]]; then
+  for d in $deps; do
+    if ! $pm_has $d; then
+      missing="$missing $d"
+    fi
+  done
+fi
+
+# Offer to install dependencies
+
+if [[ ! -z "$missing" ]]; then
+  echo "$tag Based on $pm, some dependencies are missing: $missing"
+  echo -n "$tag Do you want to run '$missing_cmd' to install them (Y/n)? "
+
+  read do_install
+  if [[ "$do_install" == "y" || "$do_install" == "Y" || "$do_install" == "" ]]; then
+    $missing_cmd
+  else
+    echo "$tag Skipping dependencies, hoping it will build anyway."
+  fi
+fi
+
+# Determine which compression to use (either gzip or xzip)
+
+if has xz; then
+  format="tar.xz"
+  decompress="-J"
+elif has gzip; then
+  format="tar.gz"
+  decompress="-z"
+else
+  echo "error: gcc archives need gzip or xzip to decompress!" >&2
+  exit 1
+fi
+
+# Deduce source URL and file names
+
+binutils_url="https://ftp.gnu.org/gnu/binutils/binutils-$binutils_version.$format"
+binutils_archive=$(basename $binutils_url)
+
+gcc_url="https://ftp.gnu.org/gnu/gcc/gcc-$gcc_version/gcc-$gcc_version.$format"
+gcc_archive="$(basename $gcc_url)"
+
+# Download archives
+
+download $binutils_url $binutils_archive
+download $gcc_url $gcc_archive
+
+# Extract archive
+
+echo "$tag Extracting $binutils_archive..."
+tar -x $decompress -f $binutils_archive
+
+echo "$tag Extracting $gcc_archive..."
+tar -x $decompress -f $gcc_archive
+
+# Create empty build folders
+
+[[ -d "build-binutils" ]] && rm -rf build-binutils
+mkdir build-binutils
+
+[[ -d "build-gcc" ]] && rm -rf build-gcc
+mkdir build-gcc

fxsdk.make

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+# fxsdk: version=1
+
+binutils_version=2.35.1
+gcc_version=10.2.0
+
+configure:
+	@ ./configure.sh $(binutils_version) $(gcc_version)
+
+build:
+	@ ./build.sh $(binutils_version) $(gcc_version)
+
+install:
+	@ ./install.sh $(CURDIR)
+
+uninstall:
+	@ ./uninstall.sh $(CURDIR)
+
+.PHONY: configure build install uninstall

install.sh

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+#! /usr/bin/env bash
+
+path=$1/bin
+tag="<sh-elf-gcc>"
+
+# Check whether there is already such a binutils in the PATH
+
+existing=$(which sh-elf-gcc)
+rc=$?
+
+if [[ $rc == 0 && "$existing" != "$path/sh-elf-gcc" ]]; then
+  echo "$tag WARNING: there seems to be another sh-elf-gcc in the PATH, be careful!" >&2
+fi
+
+if [[ $rc == 0 && "$existing" == "$path/sh-elf-gcc" ]]; then
+  echo "$tag This build is already in the PATH, there is nothing to do." >&2
+  exit 0
+fi
+
+# Try to find a suitable default
+
+default="$HOME/.profile"
+candidates="$HOME/.zprofile $HOME/.profile $HOME/.bash_profile $HOME/.zshrc $HOME/.bashrc"
+
+for c in $candidates; do
+  if [[ -f $c ]]; then
+    default=$c
+    break
+  fi
+done
+
+# Suggest to add the path to binaries to the PATH at startup
+
+cat <<EOF
+===============================================================================
+sh-elf-gcc has been compiled but is not in the PATH, so it can't be used yet.
+I can add this line to your profile to update the PATH when you log in:
+
+export PATH="\$PATH:$path"
+
+* Press Enter to add this line to $default
+* Or type "-" to skip this step
+* Or type in another file name
+EOF
+
+read -p "> " startup_file
+[[ -z "$startup_file" ]] && startup_file=$default
+
+if [[ "$startup_file" == "-" ]]; then
+  echo "$tag Skipped setting the PATH."
+else
+  echo "export PATH=\"\$PATH:$path\"" >> $startup_file
+  echo "$tag Set the PATH in $startup_file, this will take effect next login."
+fi
+

uninstall.sh

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+#! /usr/bin/env bash
+
+rm -rf bin/ include/ lib/ libexec/ sh3eb-elf/ share/
+rm -rf binutils-*/ binutils-*.tar.* gcc-*/ gcc-*.tar.*
+rm -rf build-binutils/ build-gcc/
+
+echo "<sh-elf-gcc> You can now remove $1/bin from your PATH."