Compiling GHC with Stack for Stack2017-07-20
While Stack is really good at magically summoning all the compilers you need, adding your own compiled compiler is not quite documented. For testing specific version that doesn't have a release, or testing your own compiler modification, it's useful to add your own compiler in a build tool that by default works in a multi compiler settings.
First make sure you have the right building environment (a C compiler, the make tool, etc.). Also alex and happy are required, which you can get with:
$ stack install alex happy
One of the useful thing that Stack does, is there's no system compiler anymore, which manifest itself by not having ghc on the $PATH. GHC requires one to bootstrap itself, so we put the default stack one in the $PATH by starting a new shell environment:
$ stack exec --no-ghc-package-path bash
Clone the sources needed:
$ git clone --recursive https://github.com/ghc/ghc
This will obviously give you the latest HEAD, so if you want to rewind to a specific version, do it here.
Now we just build GHC; apply variant of those steps if you want specific configuration here (see GHC building guide):
$ cd ghc $ ./boot $ ./configure $ make
Make a binary dist
It's possible to skip this step by having ./configure called with the right
prefix above and doing
make install now, but in the spirit of caching &
re-use, and also to adopt the exact same procedure that stack is doing when
installing a GHC compiler, we will create a binary dist.
To create a binary dist:
$ make binary-dist
Now if everything went according to plan, you have a tarball on the root of the
ghc build repository in a format vaguely of
at this stage if you plan to reuse, you can cache it somewhere, make it
available for your company, etc..
Install for stack
Unpack the bindist in a temp dir (don't forget to replace the variables):
$ mkdir $TMPDIR $ cp $TARBALL $TMPDIR $ tar xvJf $TARBALL
Then run the bindist to install itself to the right place (again replacing the variables):
$ cd $TARBALLDIR $ ./configure --prefix=$(stack path --programs)/$GHCVER $ make install $ echo -e "installed" > $(stack path --programs)/$GHCVER.installed
Configure your compiler
Now create a new
my.yaml file to use your new compiler:
compiler: $GHCVER compiler-check: match-exact resolver: $RESOLVER allow-newer: true
Make sure it works:
$ stack --stack-yaml my.yaml ghc -- --version $GHCVER
That's it, it's all ready.
$ stack --stack-yaml my.yaml build ...