|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.
|Support for package databases
|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.
We typically get packages from several databases, and stack them
together. This type lets us be explicit about that stacking. For example
typical stacks include:
[GlobalPackageDB, SpecificPackageDB "package.conf.inplace"]
Note that the GlobalPackageDB is invariably at the bottom since it
contains the rts, base and other special compiler-specific packages.
We are not restricted to using just the above combinations. In particular
we can use several custom package dbs and the user package db together.
When it comes to writing, the top most (last) package is used.
|Return the package that we should register into. This is the package db at
the top of the stack.
|Support for optimisation levels
|Some compilers support optimising. Some have different levels.
For compliers that do not the level is just capped to the level
they do support.
|Support for language extensions
|For the given compiler, return the flags for the supported extensions.
|For the given compiler, return the extensions it does not support.
|Produced by Haddock version 2.6.0|