讀後感: Install ghcjs for ghc 8.4.3 on archlinux

ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.4.3

1 參考 GitHub - ghcjs/ghcjs at ghc-8.4

1.1 getting and preparing the source tree

add step git checkout ghc-8.4

git clone https://github.com/ghcjs/ghcjs.git
cd ghcjs
git checkout ghc-8.4
git submodule update --init --recursive
./utils/makePackages.sh

1.2 building the compiler

You can use cabal-install and stack to set up a build environment that contains these packages.

1.2.1 Cabal new-build

stack install cabal-install
cabal update
cabal new-configure
cabal new-build

1.2.2 link to executables

DON'T DO THIS, IT IS NOT NECESSARY

Since cabal new-build does not install executables or wrapper scripts, we need to make them accessible by hand. You can do this by creating symlinks to the /utils/dist-newstyle-wrapper.sh script.

For example if the .bin directory is in your PATH:

cd .bin
ln -s ../utils/dist-newstyle-wrapper.sh ghcjs
ln -s ../utils/dist-newstyle-wrapper.sh ghcjs-pkg
ln -s ../utils/dist-newstyle-wrapper.sh haddock-ghcjs
ln -s ../utils/dist-newstyle-wrapper.sh hsc2hs-ghcjs
ln -s ../utils/dist-newstyle-wrapper.sh ghcjs-boot
ln -s ../utils/dist-newstyle-wrapper.sh ghcjs-run

1.2.3 stack

DON'T DO THIS
```
stack build
```
DO THIS
```
stack install
```

1.2.4 install haddock

error message: Haddock's resource directory does not exist!

this step is useless for above error message.

cabal install haddock

stack haddock

1.3 Booting GHCJS

ghcjs-boot

when invoked without arguments, ghcjs-boot will build the libraries from boot.tar (unless the current directory contains a boot.yaml file), installed in GHCJS' data directory (boot.tar is generated by the makePackages.sh script and included in a source distribution).

1.4 Test

$ echo 'main = putStrLn "Hello World!"' > helloWorld.hs
$ stack exec -- ghcjs -o helloWorld helloWorld.hs
$ node helloWorld.jsexe/all.js
Hello world!

test is OK.

I don't know why. But these steps are work for me to install ghcjs with ghc-8.4.3

2 參考 Peachful Space - ghcjs on Arch Linux 和以下指令：(FAIL)

this is not work.

# install stack, haskell-stack, node.js and alex using pacman
$ sudo pacman -S stack haskell-stack nodejs alex

$ cd && git clone https://github.com/ghcjs/ghcjs.git

# if you `stack setup` now you'll get an error saying /usr/lib/libtinfo.so.5 cannot be found

# install libtinfo from AUR
$ cd ~/build-aur
$ git clone https://aur.archlinux.org/libtinfo.git
$ cd libtinfo
$ makepkg -sri

# introducing the terrible hack...  I know, but it's the only way I can make it work
$ sudo ln -s /usr/lib/libtinfo.so /usr/lib/libtinfo.so.5

$ cd ~/ghcjs
$ stack setup
$ stack build
$ stack exec -- ghcjs-boot --dev

$ echo 'main = putStrLn "Hello World!"' > helloWorld.hs
$ stack exec -- ghcjs -o helloWorld helloWorld.hs
$ node helloWorld.jsexe/all.js
Hello world!