base-feature-macros: Semantic CPP feature macros for base

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This provides a set of feature macros describing features of base in a semantic way.

See base-feature-macros.h for set of currently provided macros.

In order to use the CPP header provided by this package, add this package as a dependency to your .cabal file, i.e.

build-depends: base-feature-macros: >= 0.1 && < 0.2

while making sure that the version specified as lower bound defines the feature-macros your code tests for. This is particularly important as CPP will implicitly treat undefined CPP macros as having the value 0. See also GNU CPP/CC's -Wundef warning to detect such errors.

Then in your code, you can include and use the <base-feature-macros.h> header like so

module M where

#include <base-feature-macros.h>

#if !HAVE_FOLDABLE_TRAVERSABLE_IN_PRELUDE
import Data.Foldable (Foldable (..))
import Prelude       hiding (foldr, foldr1)
#endif
#if !HAVE_MONOID_IN_PRELUDE
import Data.Monoid hiding ((<>))
#endif

This package is inspired by the blogpost &quot;Make macros mean something &#8211; readable backwards compatibility with CPP&quot;.

Properties

Versions 0.1, 0.1, 0.1.0.1
Change log None available
Dependencies base (>=4.3 && <4.11) [details]
License BSD-3-Clause
Author Herbert Valerio Riedel
Maintainer hvr@gnu.org
Category Development
Bug tracker https://github.com/hvr/base-feature-macros/issues
Source repo head: git clone https://github.com/hvr/base-feature-macros.git
Uploaded by HerbertValerioRiedel at 2017-05-13T08:38:13Z

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