Cabal- A framework for packaging Haskell software

CopyrightIsaac Jones 2003-2004
Safe HaskellSafe




This has an enumeration of the various compilers that Cabal knows about. It also specifies the default compiler. Sadly you'll often see code that does case analysis on this compiler flavour enumeration like:

case compilerFlavor comp of
  GHC -> GHC.getInstalledPackages verbosity packageDb progconf
  JHC -> JHC.getInstalledPackages verbosity packageDb progconf

Obviously it would be better to use the proper Compiler abstraction because that would keep all the compiler-specific code together. Unfortunately we cannot make this change yet without breaking the UserHooks api, which would break all custom Setup.hs files, so for the moment we just have to live with this deficiency. If you're interested, see ticket #57.


Compiler flavor

defaultCompilerFlavor :: Maybe CompilerFlavor

The default compiler flavour to pick when compiling stuff. This defaults to the compiler used to build the Cabal lib.

However if it's not a recognised compiler then it's Nothing and the user will have to specify which compiler they want.

parseCompilerFlavorCompat :: ReadP r CompilerFlavor

Like classifyCompilerFlavor but compatible with the old ReadS parser.

It is compatible in the sense that it accepts only the same strings, eg GHC but not "ghc". However other strings get mapped to OtherCompiler. The point of this is that we do not allow extra valid values that would upset older Cabal versions that had a stricter parser however we cope with new values more gracefully so that we'll be able to introduce new value in future without breaking things so much.

Compiler id

data CompilerId


Eq CompilerId 
Ord CompilerId 
Read CompilerId 
Show CompilerId 
Generic CompilerId 
Binary CompilerId 
Text CompilerId 
type Rep CompilerId 

Compiler info

data CompilerInfo

Compiler information used for resolving configurations. Some fields can be set to Nothing to indicate that the information is unknown.




compilerInfoId :: CompilerId

Compiler flavour and version.

compilerInfoAbiTag :: AbiTag

Tag for distinguishing incompatible ABI's on the same architecture/os.

compilerInfoCompat :: Maybe [CompilerId]

Other implementations that this compiler claims to be compatible with, if known.

compilerInfoLanguages :: Maybe [Language]

Supported language standards, if known.

compilerInfoExtensions :: Maybe [Extension]

Supported extensions, if known.


Read CompilerInfo 
Show CompilerInfo 
Generic CompilerInfo 
Binary CompilerInfo 
type Rep CompilerInfo 

unknownCompilerInfo :: CompilerId -> AbiTag -> CompilerInfo

Make a CompilerInfo of which only the known information is its CompilerId, its AbiTag and that it does not claim to be compatible with other compiler id's.

data AbiTag


AbiTag String 


Eq AbiTag 
Read AbiTag 
Show AbiTag 
Generic AbiTag 
Binary AbiTag 
Text AbiTag 
type Rep AbiTag 

abiTagString :: AbiTag -> String