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Split the Cabal instructions to another page

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GF Developer's Guide: Old installation instructions with Cabal
This page contains the old installation instructions from the [Developer's Guide ../doc/gf-developers.html].
We recommend Stack as a primary installation method, because it's easier for a Haskell beginner, and we want to keep the main instructions short.
But if you are an experienced Haskeller and want to keep using Cabal, here are the old instructions using ``cabal install``.
Note that some of these instructions may be outdated. Other parts may still be useful.
== Compilation from source with Cabal ==
The build system of GF is based on //Cabal//, which is part of the
Haskell Platform, so no extra steps are needed to install it. In the simplest
case, all you need to do to compile and install GF, after downloading the
source code as described above, is
```
$ cabal install
```
This will automatically download any additional Haskell libraries needed to
build GF. If this is the first time you use Cabal, you might need to run
``cabal update`` first, to update the list of available libraries.
If you want more control, the process can also be split up into the usual
//configure//, //build// and //install// steps.
=== Configure ===
During the configuration phase Cabal will check that you have all
necessary tools and libraries needed for GF. The configuration is
started by the command:
```
$ cabal configure
```
If you don't see any error message from the above command then you
have everything that is needed for GF. You can also add the option
``-v`` to see more details about the configuration.
You can use ``cabal configure --help`` to get a list of configuration options.
=== Build ===
The build phase does two things. First it builds the GF compiler from
the Haskell source code and after that it builds the GF Resource Grammar
Library using the already build compiler. The simplest command is:
```
$ cabal build
```
Again you can add the option ``-v`` if you want to see more details.
==== Parallel builds ====
If you have Cabal>=1.20 you can enable parallel compilation by using
```
$ cabal build -j
```
or by putting a line
```
jobs: $ncpus
```
in your ``.cabal/config`` file. Cabal
will pass this option to GHC when building the GF compiler, if you
have GHC>=7.8.
Cabal also passes ``-j`` to GF to enable parallel compilation of the
Resource Grammar Library. This is done unconditionally to avoid
causing problems for developers with Cabal<1.20. You can disable this
by editing the last few lines in ``WebSetup.hs``.
=== Install ===
After you have compiled GF you need to install the executable and libraries
to make the system usable.
```
$ cabal copy
$ cabal register
```
This command installs the GF compiler for a single user, in the standard
place used by Cabal.
On Linux and Mac this could be ``$HOME/.cabal/bin``.
On Mac it could also be ``$HOME/Library/Haskell/bin``.
On Windows this is ``C:\Program Files\Haskell\bin``.
The compiled GF Resource Grammar Library will be installed
under the same prefix, e.g. in
``$HOME/.cabal/share/gf-3.3.3/lib`` on Linux and
in ``C:\Program Files\Haskell\gf-3.3.3\lib`` on Windows.
If you want to install in some other place then use the ``--prefix``
option during the configuration phase.
=== Clean ===
Sometimes you want to clean up the compilation and start again from clean
sources. Use the clean command for this purpose:
```
$ cabal clean
```
%=== SDist ===
%
%You can use the command:
%
%% This does *NOT* include everything that is needed // TH 2012-08-06
%```
%$ cabal sdist
%```
%
%to prepare archive with all source codes needed to compile GF.
=== Known problems with Cabal ===
Some versions of Cabal (at least version 1.16) seem to have a bug that can
cause the following error:
```
Configuring gf-3.x...
setup: Distribution/Simple/PackageIndex.hs:124:8-13: Assertion failed
```
The exact cause of this problem is unclear, but it seems to happen
during the configure phase if the same version of GF is already installed,
so a workaround is to remove the existing installation with
```
ghc-pkg unregister gf
```
You can check with ``ghc-pkg list gf`` that it is gone.
== Compilation with make ==
If you feel more comfortable with Makefiles then there is a thin Makefile
wrapper arround Cabal for you. If you just type:
```
$ make
```
the configuration phase will be run automatically if needed and after that
the sources will be compiled.
%% cabal build rgl-none does not work with recent versions of Cabal
%If you don't want to compile the resource library
%every time then you can use:
%```
%$ make gf
%```
For installation use:
```
$ make install
```
For cleaning:
```
$ make clean
```
%and to build source distribution archive run:
%```
%$ make sdist
%```
== Partial builds of RGL ==
**NOTE**: The following doesn't work with recent versions of ``cabal``. //(This comment was left in 2015, so make your own conclusions.)//
%% // TH 2015-06-22
%Sometimes you just want to work on the GF compiler and don't want to
%recompile the resource library after each change. In this case use
%this extended command:
%```
%$ cabal build rgl-none
%```
The resource grammar library can be compiled in two modes: with present
tense only and with all tenses. By default it is compiled with all
tenses. If you want to use the library with only present tense you can
compile it in this special mode with the command:
```
$ cabal build present
```
You could also control which languages you want to be recompiled by
adding the option ``langs=list``. For example the following command
will compile only the English and the Swedish language:
```
$ cabal build langs=Eng,Swe
```

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@@ -138,125 +138,7 @@ source code as described above, is
$ cabal install
```
This will automatically download any additional Haskell libraries needed to
build GF. If this is the first time you use Cabal, you might need to run
``cabal update`` first, to update the list of available libraries.
If you want more control, the process can also be split up into the usual
//configure//, //build// and //install// steps.
=== Configure ===
During the configuration phase Cabal will check that you have all
necessary tools and libraries needed for GF. The configuration is
started by the command:
```
$ cabal configure
```
If you don't see any error message from the above command then you
have everything that is needed for GF. You can also add the option
``-v`` to see more details about the configuration.
You can use ``cabal configure --help`` to get a list of configuration options.
=== Build ===
The build phase does two things. First it builds the GF compiler from
the Haskell source code and after that it builds the GF Resource Grammar
Library using the already build compiler. The simplest command is:
```
$ cabal build
```
Again you can add the option ``-v`` if you want to see more details.
==== Parallel builds ====
If you have Cabal>=1.20 you can enable parallel compilation by using
```
$ cabal build -j
```
or by putting a line
```
jobs: $ncpus
```
in your ``.cabal/config`` file. Cabal
will pass this option to GHC when building the GF compiler, if you
have GHC>=7.8.
Cabal also passes ``-j`` to GF to enable parallel compilation of the
Resource Grammar Library. This is done unconditionally to avoid
causing problems for developers with Cabal<1.20. You can disable this
by editing the last few lines in ``WebSetup.hs``.
==== Partial builds ====
**NOTE**: The following doesn't work with recent versions of ``cabal``.
%% // TH 2015-06-22
Sometimes you just want to work on the GF compiler and don't want to
recompile the resource library after each change. In this case use
this extended command:
```
$ cabal build rgl-none
```
The resource library could also be compiled in two modes: with present
tense only and with all tenses. By default it is compiled with all
tenses. If you want to use the library with only present tense you can
compile it in this special mode with the command:
```
$ cabal build present
```
You could also control which languages you want to be recompiled by
adding the option ``langs=list``. For example the following command
will compile only the English and the Swedish language:
```
$ cabal build langs=Eng,Swe
```
=== Install ===
After you have compiled GF you need to install the executable and libraries
to make the system usable.
```
$ cabal copy
$ cabal register
```
This command installs the GF compiler for a single user, in the standard
place used by Cabal.
On Linux and Mac this could be ``$HOME/.cabal/bin``.
On Mac it could also be ``$HOME/Library/Haskell/bin``.
On Windows this is ``C:\Program Files\Haskell\bin``.
The compiled GF Resource Grammar Library will be installed
under the same prefix, e.g. in
``$HOME/.cabal/share/gf-3.3.3/lib`` on Linux and
in ``C:\Program Files\Haskell\gf-3.3.3\lib`` on Windows.
If you want to install in some other place then use the ``--prefix``
option during the configuration phase.
=== Clean ===
Sometimes you want to clean up the compilation and start again from clean
sources. Use the clean command for this purpose:
```
$ cabal clean
```
//The old (partially outdated) instructions for Cabal are moved to a [separate page ../doc/gf-developers-old-cabal.html]. If you run into trouble with ``cabal install``, you may want to take a look.//
%=== SDist ===