Cabal-1.16.0: A framework for packaging Haskell software

Safe HaskellNone



This is an alternative build system that delegates everything to the make program. All the commands just end up calling make with appropriate arguments. The intention was to allow preexisting packages that used makefiles to be wrapped into Cabal packages. In practice essentially all such packages were converted over to the "Simple" build system instead. Consequently this module is not used much and it certainly only sees cursory maintenance and no testing. Perhaps at some point we should stop pretending that it works.

Uses the parsed command-line from Distribution.Simple.Setup in order to build Haskell tools using a backend build system based on make. Obviously we assume that there is a configure script, and that after the ConfigCmd has been run, there is a Makefile. Further assumptions:

We assume the configure script accepts --with-hc, --with-hc-pkg, --prefix, --bindir, --libdir, --libexecdir, --datadir.
We assume that the default Makefile target will build everything.
We assume there is an install target. Note that we assume that this does *not* register the package!
We assume there is a copy target, and a variable $(destdir). The copy target should probably just invoke make install recursively (e.g. $(MAKE) install prefix=$(destdir)/$(prefix) bindir=$(destdir)/$(bindir). The reason we can't invoke make install directly here is that we don't know the value of $(prefix).
We assume there is a dist target.
We assume there is a register target and a variable $(user).
We assume there is an unregister target.
We assume there is a docs or doc target.



data License Source

This datatype indicates the license under which your package is released. It is also wise to add your license to each source file using the license-file field. The AllRightsReserved constructor is not actually a license, but states that you are not giving anyone else a license to use or distribute your work. The comments below are general guidelines. Please read the licenses themselves and consult a lawyer if you are unsure of your rights to release the software.


GPL (Maybe Version)

GNU Public License. Source code must accompany alterations.

LGPL (Maybe Version)

Lesser GPL, Less restrictive than GPL, useful for libraries.


3-clause BSD license, newer, no advertising clause. Very free license.


4-clause BSD license, older, with advertising clause. You almost certainly want to use the BSD3 license instead.


The MIT license, similar to the BSD3. Very free license.

Apache (Maybe Version)

The Apache License. Version 2.0 is the current version, previous versions are considered historical.


Holder makes no claim to ownership, least restrictive license.


No rights are granted to others. Undistributable. Most restrictive.


Some other license.

UnknownLicense String

Not a recognised license. Allows us to deal with future extensions more gracefully.

data Version Source

A Version represents the version of a software entity.

An instance of Eq is provided, which implements exact equality modulo reordering of the tags in the versionTags field.

An instance of Ord is also provided, which gives lexicographic ordering on the versionBranch fields (i.e. 2.1 > 2.0, 1.2.3 > 1.2.2, etc.). This is expected to be sufficient for many uses, but note that you may need to use a more specific ordering for your versioning scheme. For example, some versioning schemes may include pre-releases which have tags "pre1", "pre2", and so on, and these would need to be taken into account when determining ordering. In some cases, date ordering may be more appropriate, so the application would have to look for date tags in the versionTags field and compare those. The bottom line is, don't always assume that compare and other Ord operations are the right thing for every Version.

Similarly, concrete representations of versions may differ. One possible concrete representation is provided (see showVersion and parseVersion), but depending on the application a different concrete representation may be more appropriate.




versionBranch :: [Int]

The numeric branch for this version. This reflects the fact that most software versions are tree-structured; there is a main trunk which is tagged with versions at various points (1,2,3...), and the first branch off the trunk after version 3 is 3.1, the second branch off the trunk after version 3 is 3.2, and so on. The tree can be branched arbitrarily, just by adding more digits.

We represent the branch as a list of Int, so version 3.2.1 becomes [3,2,1]. Lexicographic ordering (i.e. the default instance of Ord for [Int]) gives the natural ordering of branches.

versionTags :: [String]

A version can be tagged with an arbitrary list of strings. The interpretation of the list of tags is entirely dependent on the entity that this version applies to.

defaultMainNoRead :: PackageDescription -> IO ()Source

Deprecated: it ignores its PackageDescription arg