Cabal-1.10.2.0: A framework for packaging Haskell softwareContentsIndex
Distribution.Compiler
Portabilityportable
Maintainercabal-devel@haskell.org
Contents
Compiler flavor
Compiler id
Description

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 #50.

Synopsis
data CompilerFlavor
= GHC
| NHC
| YHC
| Hugs
| HBC
| Helium
| JHC
| LHC
| UHC
| OtherCompiler String
buildCompilerFlavor :: CompilerFlavor
defaultCompilerFlavor :: Maybe CompilerFlavor
parseCompilerFlavorCompat :: ReadP r CompilerFlavor
data CompilerId = CompilerId CompilerFlavor Version
Compiler flavor
data CompilerFlavor
Constructors
GHC
NHC
YHC
Hugs
HBC
Helium
JHC
LHC
UHC
OtherCompiler String
show/hide Instances
buildCompilerFlavor :: CompilerFlavor
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
Constructors
CompilerId CompilerFlavor Version
show/hide Instances
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