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#!/usr/bin/env bash
# Craig Jennings <c@cjennings.net>
# Build & install Emacs from source
# safe, user-local, fast, versioned.
set -Eeuo pipefail
IFS=$'\n\t'
# ------------------------ Config (overwrite via ENV) -----------------------
SRC_DIR="${SRC_DIR:-$HOME/code/emacs-src}"
EMACS_REPO="${EMACS_REPO:-https://git.savannah.gnu.org/git/emacs.git}"
CHECKOUT_REF="${CHECKOUT_REF:-emacs-30.2}"
PREFIX_BASE="${PREFIX_BASE:-$HOME/.local/src/emacs}"
# Add DEBUG_BUILD flag
DEBUG_BUILD="${DEBUG_BUILD:-1}"
if [[ "$DEBUG_BUILD" == "1" ]]; then
PREFIX="${PREFIX:-$PREFIX_BASE/${CHECKOUT_REF}-debug}"
CFLAGS="${CFLAGS:--O0 -g}"
ENABLE_CHECKING="${ENABLE_CHECKING:-yes,glyphs}"
ENABLE_NATIVE="${ENABLE_NATIVE:-0}" # Disable native comp for debug
else
PREFIX="${PREFIX:-$PREFIX_BASE/${CHECKOUT_REF}}"
CFLAGS="${CFLAGS:--O2 -g}"
ENABLE_CHECKING="${ENABLE_CHECKING:-no}"
ENABLE_NATIVE="${ENABLE_NATIVE:-1}"
fi
LOG_DIR="${LOG_DIR:-$HOME/}"
WITH_PGTK="${WITH_PGTK:-0}"
JOBS="${JOBS:-auto}"
EXTRA_CONFIG="${EXTRA_CONFIG:-}"
# --------------------------------- Preflight ---------------------------------
umask 022
mkdir -p "$LOG_DIR" "$PREFIX_BASE" "$HOME/.local/bin"
: "${LOGFILE:=$LOG_DIR/emacs-build-$(date +%Y%m%d-%H%M%S)-${CHECKOUT_REF}${DEBUG_BUILD:+-debug}.log}"
say() { printf '>>> %s\n' "$*" | tee -a "$LOGFILE" ; }
run() {
say "+ $*"
if ! eval "$@" >>"$LOGFILE" 2>&1; then
echo "ERROR: Command failed: $*" >&2
echo "Last 20 lines of output:" >&2
tail -n 20 "$LOGFILE" >&2
return 1
fi
}
on_err(){
ec=$?
echo "ERROR [$ec] - Full log at: $LOGFILE" >&2
echo "Last 100 lines of log:" >&2
tail -n 100 "$LOGFILE" >&2 || true
exit "$ec"
}
trap on_err ERR
# -------------------------- Arch Linux Dependencies --------------------------
if [[ -r /etc/os-release ]]; then
. /etc/os-release
fi
if [[ "${ID:-}" == "arch" || "${ID_LIKE:-}" == *arch* ]]; then
say "Arch Linux detected; checking required build/runtime packages"
# Base packages needed for the requested configure flags
pkgs=(jansson tree-sitter imagemagick mailutils harfbuzz cairo gnutls libxml2 texinfo gtk3)
# Only if native-compilation is enabled
if [[ "${ENABLE_NATIVE:-1}" == "1" ]]; then
pkgs+=(libgccjit)
fi
# List packages that are not installed
missing="$(pacman -T "${pkgs[@]}" || true)"
if [[ -z "$missing" ]]; then
say "All required packages are already installed."
else
say "Missing packages: $missing"
if command -v sudo >/dev/null 2>&1 && sudo -n true 2>/dev/null; then
run "sudo -n pacman -Sy --needed --noconfirm $missing"
else
say "sudo (passwordless) not available; please install missing packages manually:"
echo " sudo pacman -Sy --needed $missing"
exit 70
fi
fi
else
say "Non-Arch system detected; skipping Arch-specific dependency check."
fi
# ----------------------------- Clone And Update ----------------------------
if [[ -d "$SRC_DIR/.git" ]]; then
run "git -C '$SRC_DIR' fetch --tags --prune"
else
mkdir -p "$(dirname "$SRC_DIR")"
run "git clone --origin origin '$EMACS_REPO' '$SRC_DIR'"
fi
run "git -C '$SRC_DIR' reset --hard HEAD"
run "git -C '$SRC_DIR' clean -fdx"
run "git -C '$SRC_DIR' checkout -f '$CHECKOUT_REF'"
run "git -C '$SRC_DIR' submodule update --init --recursive || true"
# ---------------------------------- Autogen ----------------------------------
if [[ -x "$SRC_DIR/autogen.sh" ]]; then
run "cd '$SRC_DIR' && ./autogen.sh"
fi
# ------------------------------ Configure Flags ------------------------------
conf_flags=(
"--prefix=${PREFIX}"
"--with-json"
"--with-modules"
)
# Add debug-specific flags
if [[ "$DEBUG_BUILD" == "1" ]]; then
say "Building DEBUG version with symbols and checking"
conf_flags+=(
"--enable-checking=${ENABLE_CHECKING}"
"--enable-check-lisp-object-type"
# Note the quotes around the entire CFLAGS assignment:
"CFLAGS=${CFLAGS}" # This keeps it as a single argument
)
fi
# Wayland/X choice
if [[ "$WITH_PGTK" == "auto" ]]; then
if [[ -n "${WAYLAND_DISPLAY:-}" ]]; then WITH_PGTK="yes"; else WITH_PGTK="no"; fi
fi
if [[ "$WITH_PGTK" == "yes" ]]; then
conf_flags+=("--with-pgtk")
else
conf_flags+=("--with-x-toolkit=gtk3")
fi
# Native-compilation
if [[ "$ENABLE_NATIVE" == "1" ]]; then
conf_flags+=("--with-native-compilation=yes")
else
conf_flags+=("--with-native-compilation=no")
fi
# Useful extras
conf_flags+=(
"--with-cairo"
"--with-harfbuzz"
"--with-tree-sitter"
"--with-imagemagick"
"--with-mailutils"
)
# Optional extra flags from env
if [[ -n "$EXTRA_CONFIG" ]]; then
conf_flags+=($EXTRA_CONFIG)
fi
# ----------------------------- Build And Install -----------------------------
mkdir -p "$PREFIX"
# Temporarily change IFS to space for configure argument expansion
old_ifs="$IFS"
IFS=' '
cd "$SRC_DIR"
"./configure" "${conf_flags[@]}"
IFS="$old_ifs"
if [[ "$JOBS" == "auto" ]]; then
if command -v nproc >/dev/null 2>&1; then JOBS=$(nproc); else JOBS=4; fi
fi
run "cd '$SRC_DIR' && make -j$JOBS"
# Build documentation (info files)
say "...building info files"
(
cd "$SRC_DIR"
run "make info"
)
run "cd '$SRC_DIR' && make install"
run "cd '$SRC_DIR' && make install-info"
# --------------------------------- Symlinks --------------------------------
if [[ "$DEBUG_BUILD" == "1" ]]; then
run "ln -sfn '$PREFIX' '$PREFIX_BASE/emacs-debug'"
# Create debug-specific symlinks
for exe in emacs emacsclient; do
target="$PREFIX/bin/$exe"
link="$HOME/.local/bin/${exe}-debug"
if [[ -x "$target" ]]; then
run "rm -f '$link'"
run "ln -s '$target' '$link'"
fi
done
say "Debug build available as 'emacs-debug' and 'emacsclient-debug'"
else
run "ln -sfn '$PREFIX' '$PREFIX_BASE/emacs-current'"
for exe in emacs emacsclient; do
target="$PREFIX/bin/$exe"
link="$HOME/.local/bin/$exe"
if [[ -x "$target" ]]; then
run "rm -f '$link'"
run "ln -s '$target' '$link'"
fi
done
fi
# ---------------------------------- Wrap Up ----------------------------------
command -v emacs >/dev/null && emacs --version | head -n1 || true
command -v emacsclient >/dev/null && emacsclient --version | head -n1 || true
# ----------------------------- Show Build Features ----------------------------
say "Launching Emacs to display version and build features..."
"$HOME/.local/bin/emacs" -Q --batch --eval '
(progn
(princ (format "Emacs version: %s\n" emacs-version))
(princ (format "Build configuration:\n"))
(princ (format " Native compilation: %s\n"
(if (and (fboundp (quote native-comp-available-p))
(native-comp-available-p))
"yes" "no")))
(princ (format " PGTK: %s\n" (if (featurep (quote pgtk)) "yes" "no")))
(princ (format " Tree-sitter: %s\n"
(if (fboundp (quote treesit-available-p)) "yes" "no")))
(princ (format " JSON: %s\n" (if (fboundp (quote json-parse-string)) "yes" "no")))
(princ (format " ImageMagick: %s\n" (if (image-type-available-p (quote imagemagick)) "yes" "no")))
(princ (format " Cairo: %s\n" (if (featurep (quote cairo)) "yes" "no")))
(princ (format "\nFull system configuration:\n%s\n" system-configuration))
(princ (format "\nConfigured features:\n%s\n" system-configuration-features)))
' 2>&1 | tee -a "$LOGFILE"
echo "Done. See $LOGFILE"
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