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Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

This is a first step towards eliminating `default-extensions` in favour of
per-file declared `{-# LANGUAGE ... #-}` pragmas.
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Soon, System.Exit will export the new `die` (see #9016

) which would clash with
Cabal's own `die` implementation. This commit provides forward-compatiblity.

This also updates the Cabal submodule which requires a similiar fix.
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

This corresponds to the RC of the soon-to-be Cabal 1.20 release

One noteworthy change is the removal of the `--with-ranlib` flag
requiring a small adaptation in the GHC build system.

Moreover two new licences were added, MPL and BSD2.

Due to https://github.com/haskell/cabal/issues/1622

 Cabal-1.20 now
allows to strip libraries as well, this doesn't work well with
`ghc-cabal copy` being fed a `":"` strip-command argument which was
simply ignored in the past. The current code tries to retain this
semantics as backward compat. However, this needs more investigation as
I'm not sure if/why the `test_bindist` step doesn't want the libraries
to be stripped on installation.
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

This unbreaks the GHC build if a non-UTF8 locale such as LANG=C is active

See also haskell/cabal#1721 and haskell/haddock#286
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Our special ghc-cabal command needs to be told that we are building with
dynamic library support when it does its copying. We do so by passing an
extra parameter from ghc.mk.

Apart from bumping build-dep version bounds, `ghc-cabal` is adapted to
some minor Cabal API changes, and `bin-package-db` is made aware of
Cabal's recently added AGPL licence support.

There's now an internal -dll-split flag, which we use to tell GHC how
the GHC package is split into 2 separate DLLs. This is used by
Packages.isDllName to determine whether a call is within the same
DLL, or whether it is a call to another DLL.

It now consistently takes directory and distDirectory as its first 2
arguments. Also, it only supports configuring 1 package at a time now
(we weren't using the ability to configure more than one at once).

Dynamic GHC is now working in-place, but pathologically slow due
to the DLL split.

(GHC assumes that all intra-package calls are in the same DLL, but that
isn't true when we split the GHC package into 2 DLLs. That means that
GHC's startup time is around 22 seconds, as it is doing run-time
linking).

Also, ghci isn't actually working yet:

$ inplace/bin/ghc-stage2 --interactive
GHCi, version 7.7.20130512: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... <command line>: can't load .so/.DLL for:
HSghc-prim-0.3.1.0.dll (addDLL: could not load DLL)
ghc-stage2.exe: HSghc-prim-0.3.1.0: The specified module could not be
found.

We had inplace/bin/ghc-cabalghc-cabal

Currently they are all set to the same value, but when cross-compiling
they could be set to different values.

We now define _PROGNAME, and _PROG is automatically defined with
$(exeext). This will shortly automatically use the right exeext
depending on what stage it is being compiled with (exeext may be
different for different stages when cross-compiling).

They share modules in Cabal, and unless they use exactly the same
flags GHC recompiles the modules.

This reverts commit c67b4313.

We no longer need to always force, as ghc-pkg is cleverer.

When dynamic-by-default, we may only have .dyn_hi files, and ghc-pkg
complains if there are no .hi files.

It doesn't really belong in package-data.mk

This required various build system changes to get the build to go
through.

In the inplace shell wrappers, we set LD_LIBRARY_PATH to allow programs
to find their libraries. In the future, we might change the inplace tree
to be the same shape as an installed tree instead. However, this would
mean changing the way we do installation, as currently we use cabal's
installation methods to install the libraries, but that only works if
the libraries are under libraries/foo/dist-install/build/..., rather
than in inplace/lib/...

Rename package database flags in both GHC and ghc-pkg so that they are
consistent with Cabal nomenclature.

Add a version check to the build system so that the correct set of
package db flags are used when the bootstrapping GHC has version < 7.5.

With Windows 7 in a vitrual box VM on OS X, some very odd things happen
with dates and time stamps when SSHing into cygwin. e.g. here the
"Change" time is in the past:

$ date; touch foo; stat foo
Fri Dec  2 16:58:07 GMTST 2011
  File: `foo'
  Size: 0               Blocks: 0          IO Block: 65536  regular
empty file
Device: 540aba0bh/1409989131d   Inode: 562949953592977  Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/     ian)   Gid: (  513/    None)
Access: 2011-12-02 16:58:07.414457900 +0000
Modify: 2011-12-02 16:58:07.414457900 +0000
Change: 2011-12-02 16:58:03.495141800 +0000
 Birth: 2011-12-02 16:57:57.731469900 +0000

And if we copy such a file, then the copy is older (as determined by the
"Modify" time) than the original:

$ date; touch foo; stat foo; cp foo bar; stat bar
Fri Dec  2 16:59:10 GMTST 2011
  File: `foo'
  Size: 0               Blocks: 0          IO Block: 65536  regular
empty file
Device: 540aba0bh/1409989131d   Inode: 1407374883725128  Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/     ian)   Gid: (  513/    None)
Access: 2011-12-02 16:59:10.118457900 +0000
Modify: 2011-12-02 16:59:10.118457900 +0000
Change: 2011-12-02 16:59:06.189477700 +0000
 Birth: 2011-12-02 16:57:57.731469900 +0000
  File: `bar'
  Size: 0               Blocks: 0          IO Block: 65536  regular
empty file
Device: 540aba0bh/1409989131d   Inode: 281474976882512  Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/     ian)   Gid: (  513/    None)
Access: 2011-12-02 16:59:06.394555800 +0000
Modify: 2011-12-02 16:59:06.394555800 +0000
Change: 2011-12-02 16:59:06.395532400 +0000
 Birth: 2011-12-02 16:58:40.921899600 +0000

This means that make thinks that things are out of date when it
shouldn't, so reinvokes itself repeatedly until the MAKE_RESTARTS
infinite-recursion test triggers.

The touchy program, like most other programs, creates files with both
Modify and Change in the past, which is still a little odd, but is
consistent, so doesn't break make.

We now make use of the ghc-packages file when making the haddock index.