AllenDang/gccemacs.md

## gccemacs.md

      
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    Use pre-built gccemacs

Fortunatly we could use pre-built gccemacs right now.
Those two repos did the greate job for us.
https://github.com/twlz0ne/nix-gccemacs-darwin
https://github.com/twlz0ne/nix-gccemacs-sierra
Here is the tutorial:
Install nix

https://nixos.org/
For MacOS catalina

Install

nix-env -iA cachix -f https://cachix.org/api/v1/install
cachix use gccemacs-darwin
nix-env -iA emacsGccDarwin -f https://github.com/twlz0ne/nix-gccemacs-darwin/archive/master.zip
Update

nix-env -iA emacsGccDarwin -f https://github.com/twlz0ne/nix-gccemacs-darwin/archive/master.zip
For MacOS sierra

Install

nix-env -iA cachix -f https://cachix.org/api/v1/install
cachix use gccemacs-sierra
nix-env -iA emacsGccSierra -f https://github.com/twlz0ne/nix-gccemacs-sierra/archive/master.zip
Update

nix-env -iA emacsGccSierra -f https://github.com/twlz0ne/nix-gccemacs-sierra/archive/master.zip
It's done

Launch emacs from terminal, and you could find related app bundle's path by right click emacs icon in Docker.
Build gccemacs on MacOS catalina

It's a hard time to make gccemacs work on MacOS catalina. I've met countless problems by following every tutorials I can get from google. Fortunately I finally get it work!
Hope this tutorial could help you.
GCC with libgccjit enabled

cd /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula
Edit gcc.rb like this
@@ -53,7 +53,7 @@ class Gcc < Formula
     #  - Ada, which requires a pre-existing GCC Ada compiler to bootstrap
     #  - Go, currently not supported on macOS
     #  - BRIG
-    languages = %w[c c++ objc obj-c++ fortran]
+    languages = %w[c c++ objc obj-c++ fortran jit]

     osmajor = `uname -r`.split(".").first
     pkgversion = "Homebrew GCC #{pkg_version} #{build.used_options*" "}".strip
@@ -73,6 +73,7 @@ class Gcc < Formula
       --with-system-zlib
       --with-pkgversion=#{pkgversion}
       --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
+      --enable-host-shared
     ]

     # Xcode 10 dropped 32-bit support
Build gcc by homebrew
brew install gcc --build-from-source --force
Get gccemacs source code

Clone https://github.com/emacs-mirror/emacs and checkout feature/native-comp branch.
Build using this script

Create a build.sh outside emacs source code folder.
# native-comp optimization
export PATH="/usr/local/opt/gnu-sed/libexec/gnubin:${PATH}"
export CFLAGS="-I/usr/local/Cellar/gcc/10.1.0/include"
export LDFLAGS="-L/usr/local/Cellar/gcc/10.1.0/lib/gcc/10 -I/usr/local/Cellar/gcc/10.1.0/include"
export LIBRARY_PATH="/usr/local/Cellar/gcc/10.1.0/lib/gcc/10:${LIBRARY_PATH:-}"

cd emacs || exit

git clean -xfd

./autogen.sh

./configure \
     --disable-dependency-tracking \
     --disable-silent-rules \
     --enable-locallisppath=/usr/local/share/emacs/28.0.50/site-lisp \
     --prefix=/usr/local/opt/gccemacs \
     --without-dbus \
     --without-imagemagick \
     --with-mailutils \
     --with-ns \
     --disable-ns-self-contained \
     --with-cairo \
     --with-modules \
     --with-xml2 \
     --with-gnutls \
     --with-json \
     --with-rsvg \
     --with-nativecomp

# Ensure /usr/local/opt/gccemacs exists
rm -rf /usr/local/opt/gccemacs
mkdir /usr/local/opt/gccemacs

# Ensure the directory to which we will dump Emacs exists and has the correct
# permissions set.
libexec=/usr/local/libexec/emacs/28.0.50
if [ ! -d $libexec ]; then
  sudo mkdir -p $libexec
  sudo chown $USER $libexec
fi

make -j4
make install 

rm -rf "/Applications/Emacs.app"
mv nextstep/Emacs.app "/Applications/"

cd /usr/local/bin || exit
rm emacs
rm emacsclient
ln -s /usr/local/opt/gccemacs/bin/emacs .
ln -s /usr/local/opt/gccemacs/bin/emacsclient .


cd /Applications/Emacs.app/Contents || exit
ln -s /usr/local/opt/gccemacs/share/emacs/28.0.50/lisp .
To use Spacemacs

No special actions are needed.
To use Doom

Latest doom already support to compile all modules with native-comp.
Update to latest version.

To do so, upgrade doom to latest version.
doom upgrade
Compile all modules

After that, do doom sync to compile all modules.
Generate local env file

Run doom env to generate local env file.
It's done.

Open emacs and feel the performance boost. Enjoy!