Cabal-1.6.0.0: A framework for packaging Haskell software Contents Index

Distribution.Simple.Compiler Portability portable Maintainer cabal-devel@haskell.org

Contents Haskell implementations Support for package databases Support for optimisation levels Support for language extensions

Description

This should be a much more sophisticated abstraction than it is. Currently it's just a bit of data about the compiler, like it's flavour and name and version. The reason it's just data is because currently it has to be in Read and Show so it can be saved along with the LocalBuildInfo. The only interesting bit of info it contains is a mapping between language extensions and compiler command line flags. This module also defines a PackageDB type which is used to refer to package databases. Most compilers only know about a single global package collection but GHC has a global and per-user one and it lets you create arbitrary other package databases. We do not yet fully support this latter feature.

Synopsis

module Distribution.Compiler data Compiler = Compiler { compilerId :: CompilerId compilerExtensions :: [(Extension, String)] } showCompilerId :: Compiler -> String compilerFlavor :: Compiler -> CompilerFlavor compilerVersion :: Compiler -> Version data PackageDB = GlobalPackageDB | UserPackageDB | SpecificPackageDB FilePath data OptimisationLevel = NoOptimisation | NormalOptimisation | MaximumOptimisation flagToOptimisationLevel :: Maybe String -> OptimisationLevel type Flag = String extensionsToFlags :: Compiler -> [Extension] -> [Flag] unsupportedExtensions :: Compiler -> [Extension] -> [Extension]

Haskell implementations

module Distribution.Compiler

data Compiler

Constructors Compiler compilerId :: CompilerId compilerExtensions :: [(Extension, String)] Instances Read Compiler Show Compiler

showCompilerId :: Compiler -> String

compilerFlavor :: Compiler -> CompilerFlavor

compilerVersion :: Compiler -> Version

Support for package databases

data PackageDB

Some compilers have a notion of a database of available packages. For some there is just one global db of packages, other compilers support a per-user or an arbitrary db specified at some location in the file system. This can be used to build isloated environments of packages, for example to build a collection of related packages without installing them globally. Constructors GlobalPackageDB UserPackageDB SpecificPackageDB FilePath Instances Eq PackageDB Read PackageDB Show PackageDB

Support for optimisation levels

data OptimisationLevel

Some compilers support optimising. Some have different levels. For compliers that do not the level is just capped to the level they do support. Constructors NoOptimisation NormalOptimisation MaximumOptimisation Instances Bounded OptimisationLevel Enum OptimisationLevel Eq OptimisationLevel Read OptimisationLevel Show OptimisationLevel

flagToOptimisationLevel :: Maybe String -> OptimisationLevel

Support for language extensions

type Flag = String

extensionsToFlags :: Compiler -> [Extension] -> [Flag]

For the given compiler, return the flags for the supported extensions.

unsupportedExtensions :: Compiler -> [Extension] -> [Extension]

For the given compiler, return the extensions it does not support.

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