[ANNOUNCE] GHC 8.2.1 release candidate 1

[Phyx]

Hi Ben,

The windows build is unusable. The settings file has $TopDir expanded and
hard-coded to the build path on drydock.

Tamar

On Mon, 10 Apr 2017, 08:14 Boespflug, Mathieu, <m at tweag.io> wrote:

> Hi Ben,
>
> this is great news! I'm particularly keen on learning more about two
> points you mentioned in your email:
>
> * Compiler performance: do you have any numbers to quantify what 8.0 vs
> 8.2 is likely to look like? How much has the work that's been done affect
> performance across the board? Or are these mostly pathological cases (e.g.
> ghc --make with high number of cores, large number of definitions in a
> module, large amount of let nesting in definitions, etc)
> * DWARF support: could you clarify at a very high-level what typical uses
> cases can be expected to work and which ones won't? Would be eager to read
> any resources you could point me at to help me understand what still needs
> to be done on this front.
>
> Many thanks,
>
> --
> Mathieu Boespflug
> Founder at http://tweag.io.
>
> On 10 April 2017 at 05:50, Ben Gamari <ben at well-typed.com> wrote:
>
>
> Hello everyone,
>
> The GHC team is very pleased to announce the first candidate of the
> 8.2.1 release of the Glasgow Haskell Compiler. Source and binary
> distributions are available at
>
>     https://downloads.haskell.org/~ghc/8.2.1-rc1/
>
> This is the first of a few release candidates leading up the final 8.2.1
> release. This release will feature,
>
>   * A new type-indexed Typeable implementation
>
>   * The long awaited Backpack
>
>   * Deriving strategies for disambiguating DeriveAnyClass,
>     GeneralizedNewtypeDeriving, and stock mechanisms
>
>   * Overloaded record fields
>
>   * Improved compiler performance
>
>   * Better code generation through more robust tracking of join points
>
>   * Compact regions for more efficient garbage collection and serialization
>
>   * Better support for machines with non-uniform memory architectures
>
>   * More robust support for levity (e.g. RuntimeRep) polymorphism
>
>   * A simple interface for streaming eventlog data from live processes
>
>   * Further refinement of DWARF support
>
> Unfortunately there are still a few known issues in this release,
> including a few compiler panics (#13233, #13509) and a memory leak in
> the simplifier (#13426) which may adversely affect heap sizes and
> compilation time for some modules. This memory leak unfortunately made
> it impossible to provide a 32-bit Windows distribution for this
> candidate; this will be resolved in -rc2.
>
> As always, please let us know if you have difficulty. Thanks to everyone
> who has contributed to this release!
>
> Happy testing,
>
> - Ben
>
>
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