Cabal- A framework for packaging Haskell software

Safe HaskellNone



This is a fairly large module. It contains most of the GHC-specific code for configuring, building and installing packages. It also exports a function for finding out what packages are already installed. Configuring involves finding the ghc and ghc-pkg programs, finding what language extensions this version of ghc supports and returning a Compiler value.

getInstalledPackages involves calling the ghc-pkg program to find out what packages are installed.

Building is somewhat complex as there is quite a bit of information to take into account. We have to build libs and programs, possibly for profiling and shared libs. We have to support building libraries that will be usable by GHCi and also ghc's -split-objs feature. We have to compile any C files using ghc. Linking, especially for split-objs is remarkably complex, partly because there tend to be 1,000's of .o files and this can often be more than we can pass to the ld or ar programs in one go.

Installing for libs and exes involves finding the right files and copying them to the right places. One of the more tricky things about this module is remembering the layout of files in the build directory (which is not explicitly documented) and thus what search dirs are used for various kinds of files.



getInstalledPackages :: Verbosity -> PackageDBStack -> ProgramConfiguration -> IO PackageIndexSource

Given a package DB stack, return all installed packages.

getPackageDBContents :: Verbosity -> PackageDB -> ProgramConfiguration -> IO PackageIndexSource

Given a single package DB, return all installed packages.

startInterpreter :: Verbosity -> ProgramConfiguration -> Compiler -> PackageDBStack -> IO ()Source

Start a REPL without loading any source files.



:: Verbosity 
-> LocalBuildInfo 
-> FilePath

install location

-> FilePath

install location for dynamic libraries

-> FilePath

Build location

-> PackageDescription 
-> Library 
-> ComponentLocalBuildInfo 
-> IO () 

Install for ghc, .hi, .a and, if --with-ghci given, .o



:: Verbosity 
-> LocalBuildInfo 
-> InstallDirs FilePath

Where to copy the files to

-> FilePath

Build location

-> (FilePath, FilePath)

Executable (prefix,suffix)

-> PackageDescription 
-> Executable 
-> IO () 

Install executables for GHC.

libAbiHash :: Verbosity -> PackageDescription -> LocalBuildInfo -> Library -> ComponentLocalBuildInfo -> IO StringSource

Extracts a String representing a hash of the ABI of a built library. It can fail if the library has not yet been built.

initPackageDB :: Verbosity -> ProgramConfiguration -> FilePath -> IO ()Source

Create an empty package DB at the specified location.

invokeHcPkg :: Verbosity -> ProgramConfiguration -> PackageDBStack -> [String] -> IO ()Source

Run 'ghc-pkg' using a given package DB stack, directly forwarding the provided command-line arguments to it.

ghcGlobalPackageDB :: Verbosity -> ConfiguredProgram -> IO FilePathSource

Return the FilePath to the global GHC package database.