abstraction · June 5, 2024 20:41
diff --git a/build-emacs28.sh b/build-emacs28.sh
 #!/usr/bin/env bash

 ## Author: Abidán Brito
 ## This script builds GNU Emacs 28 with support for native elisp compilation,
 ## libjansson (C JSON library), mailutils, and Webkit widgets (xwidgets).

 # Exit on error and print out commands before executing them.
 set -euxo pipefail 

 # Let's set the number of jobs to something reasonable; keep 2 cores
 # free to avoid choking the computer during compilation.
 JOBS=`nproc --ignore=2`

 # Clone repo locally and get into it.
 git clone --branch emacs-28 git://git.savannah.gnu.org/emacs.git
 pushd emacs

 # Get essential dependencies.
 sudo apt install -y build-essential \
    texinfo \
    libgnutls28-dev \
    libjpeg-dev \
    libpng-dev \
    libtiff5-dev \
    libgif-dev \
    libxpm-dev \
    libncurses-dev \
    libmagick++-dev

 # Get dependencies for gcc-10 and the build process.
 sudo apt update -y \
 && apt install -y gcc-10 g++-10 libgccjit0 libgccjit-10-dev

 # Get dependencies for fast JSON.
 sudo apt install -y libjansson4 libjansson-dev

 # Get GNU Mailutils (protocol-independent mail framework).
 sudo apt install -y mailutils

 # Get Xwidgets dependencies.
 sudo apt install -y libgtk-3-dev

 # Enable source packages and get dependencies for whatever 
 # Emacs version Ubuntu supports by default.
 #
 # Taken from here:
 # https://www.masteringemacs.org/article/speed-up-emacs-libjansson-native-elisp-compilation
 #sudo sed -i 's/# deb-src/deb-src/' /etc/apt/sources.list \
 #    && apt update \
 #    && apt build-dep -y emacs

 # Stop debconf from complaining about postfix nonsense.
 DEBIAN_FRONTEND=noninteractive

 # Needed for compiling libgccjit or we'll get cryptic error messages.
 export CC=/usr/bin/gcc-10 CXX=/usr/bin/g++-10

 # Configure and run.
 #
 # Compiler flags:
 # -O2 -> Turn on a bunch of optimization flags. There's also -O3, but it increases
 #        the instruction cache footprint, which may end up reducing performance.
 # -pipe -> Reduce temporary files to the minimum.
 # -mtune=native -> Optimize code for the local machine (under ISA constraints).
 # -march=native -> Enable all instruction subsets supported by the local machine.
 # -fomit-frame-pointer -> I'm not sure what this does yet...
 #
 # NOTE(abi): binaries should go to /opt/emacs. If you remove the --prefix argument
 # they should go to /usr/local/bin by default.
 ./autogen.sh \
    && ./configure --with-native-compilation \
    --with-json \
    --with-gnutls \
    --with-mailutils \
    --with-cairo \
    --with-imagemagick \
    --with-x-toolkit=gtk3 \
    --with-xwidgets \
    --prefix=/opt/emacs \
    CFLAGS="-O2 -pipe -mtune=native -march=native -fomit-frame-pointer"

 # Build.
 #
 # NOTE(abi): NATIVE_FULL_AOT=1 ensures native compilation ahead-of-time for
 # all elisp files included in the distribution.
 make -j${JOBS} NATIVE_FULL_AOT=1
 sudo make install

 # Return to the original path.
 popd
	#!/usr/bin/env bash

	## Author: Abidán Brito
	## This script builds GNU Emacs 28 with support for native elisp compilation,
	## libjansson (C JSON library), mailutils, and Webkit widgets (xwidgets).

	# Exit on error and print out commands before executing them.
	set -euxo pipefail

	# Let's set the number of jobs to something reasonable; keep 2 cores
	# free to avoid choking the computer during compilation.
	JOBS=`nproc --ignore=2`

	# Clone repo locally and get into it.
	git clone --branch emacs-28 git://git.savannah.gnu.org/emacs.git
	pushd emacs

	# Get essential dependencies.
	sudo apt install -y build-essential \
	texinfo \
	libgnutls28-dev \
	libjpeg-dev \
	libpng-dev \
	libtiff5-dev \
	libgif-dev \
	libxpm-dev \
	libncurses-dev \
	libmagick++-dev

	# Get dependencies for gcc-10 and the build process.
	sudo apt update -y \
	&& apt install -y gcc-10 g++-10 libgccjit0 libgccjit-10-dev

	# Get dependencies for fast JSON.
	sudo apt install -y libjansson4 libjansson-dev

	# Get GNU Mailutils (protocol-independent mail framework).
	sudo apt install -y mailutils

	# Get Xwidgets dependencies.
	sudo apt install -y libgtk-3-dev

	# Enable source packages and get dependencies for whatever
	# Emacs version Ubuntu supports by default.
	#
	# Taken from here:
	# https://www.masteringemacs.org/article/speed-up-emacs-libjansson-native-elisp-compilation
	#sudo sed -i 's/# deb-src/deb-src/' /etc/apt/sources.list \
	# && apt update \
	# && apt build-dep -y emacs

	# Stop debconf from complaining about postfix nonsense.
	DEBIAN_FRONTEND=noninteractive

	# Needed for compiling libgccjit or we'll get cryptic error messages.
	export CC=/usr/bin/gcc-10 CXX=/usr/bin/g++-10

	# Configure and run.
	#
	# Compiler flags:
	# -O2 -> Turn on a bunch of optimization flags. There's also -O3, but it increases
	# the instruction cache footprint, which may end up reducing performance.
	# -pipe -> Reduce temporary files to the minimum.
	# -mtune=native -> Optimize code for the local machine (under ISA constraints).
	# -march=native -> Enable all instruction subsets supported by the local machine.
	# -fomit-frame-pointer -> I'm not sure what this does yet...
	#
	# NOTE(abi): binaries should go to /opt/emacs. If you remove the --prefix argument
	# they should go to /usr/local/bin by default.
	./autogen.sh \
	&& ./configure --with-native-compilation \
	--with-json \
	--with-gnutls \
	--with-mailutils \
	--with-cairo \
	--with-imagemagick \
	--with-x-toolkit=gtk3 \
	--with-xwidgets \
	--prefix=/opt/emacs \
	CFLAGS="-O2 -pipe -mtune=native -march=native -fomit-frame-pointer"

	# Build.
	#
	# NOTE(abi): NATIVE_FULL_AOT=1 ensures native compilation ahead-of-time for
	# all elisp files included in the distribution.
	make -j${JOBS} NATIVE_FULL_AOT=1
	sudo make install

	# Return to the original path.
	popd