.. -*- rst -*-

============
wip/ghc TODO
============

* Build more bootstrapping HC archives to support more platforms.


--------------------------
How to build an HC archive
--------------------------

It's basically the same as the `Porting Guide
<http://hackage.haskell.org/trac/ghc/wiki/Building/Porting>`_, plus
some minor tweaks.

Extract the source archive and duplicate the source tree, one for
``-target`` and one for ``-host``::

    $ tar jxf ghc-{VERSION}-src.tar.bz2
    $ cp -r ghc-{VERSION} ghc-{VERSION}-target
    $ mv ghc-{VERSION} ghc-{VERSION}-host

Build some configuration files::

    $ cd ghc-{VERSION}-target
    $ ln -s /bin/pwd utils/ghc-pwd/ghc-pwd
    $ ./configure --enable-hc-boot
    $ echo "INTEGER_LIBRARY = integer-simple" > mk/build.mk
    $ gmake bootstrapping-files
    $ cd ..

Run ``./configure`` on the host tree::

    $ cd ghc-{VERSION}-host
    $ ./configure

Then create ``ghc-{VERSION}-host/mk/build.mk`` with the following
contents::

    PORTING_HOST = YES
    GhcUnregisterised = YES
    GhcLibHcOpts = -O -fvia-C -keep-hc-files
    GhcRtsHcOpts = -keep-hc-files
    GhcLibWays = v
    GhcRTSWays =
    SplitObjs = NO
    GhcWithNativeCodeGen = NO
    GhcWithInterpreter = NO
    GhcStage1HcOpts = -O
    GhcStage2HcOpts = -O -fvia-C -keep-hc-files
    SRC_HC_OPTS += -H32m
    GhcWithSMP = NO
    utils/ghc-pkg_dist-install_v_HC_OPTS += -keep-hc-files
    
    INTEGER_LIBRARY = integer-simple

Copy some configuration files from the ``-target`` tree::

    $ cp ../ghc-{VERSION}-target/includes/{ghcautoconf.h,DerivedConstants.h,GHCConstants.h} includes/

Build it::

    $ gmake

Create an intermediate tarball::

    $ rm -f list mkfiles boot.tar.gz
    $ find . -name "*.hi" >> list
    $ find . -name "*.hc" >> list
    $ find . -name "*_stub.c" >> list
    $ find . -name "*_stub.h" >> list
    $ find . -name package-data.mk >> list
    $ find . -name package.conf.d >> list
    $ find . -name package.conf.inplace >> list
    $ ls compiler/stage?/build/Config.hs >> list
    $ echo compiler/prelude/primops.txt >> list
    $ ls compiler/primop-*.hs-incl >> list
    $ find . -name .depend | sed -e 's/^/mkdir -p `dirname /' -e 's/$/`/' >> mkfiles
    $ find . -name .depend | sed "s/^/touch /" >> mkfiles
    $ echo mkfiles >> list
    $ tar -zcf boot.tar.gz -T list

Then extract it again, in a different directory::

    $ mkdir ghc-{VERSION}
    $ cd ghc-{VERSION}
    $ tar zxf ../boot.tar.gz

Modify hard-coded paths in inplace ``.conf`` files, and then
re-archive the HC tree::

    $ sed -i.bak -e 's#'`dirname \`pwd\``'#[[GHC_SOURCE_PATH]]#g' \
          inplace/lib/package.conf.d/*.conf \
          */*/package-data.mk \
          */*/*/package-data.mk
    $ cd ..
    $ tar jcf ghc-{VERSION}-boot-{PLATFORM}.tar.bz2 ghc-{VERSION}

Done. Upload the archive to some host and add it to the ``Makefile``.