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This patch does a few things
- Moved GHC x86 to MinGW-w64 (Using Awson's patch)
- Moves Both GHCs to MSYS2 toolchains
- Completely removes the dependencies on the git tarball repo
- Downloads only the required tarball for the architecture for
which we are building
- Downloads the perl tarball is missing as well
- Fixed a few bugs in the linker to fix tests on Windows
The links currently point to repo.msys2.org and GitHub, it might be
more desirable to mirror them on
http://downloads.haskell.org/~ghc/mingw/ as with the previous patch
attempt.
For more details on what the MSYS2 packages I include see #10726
(Awson's comment). but it should contain all we need
and no python or fortran, which makes the uncompressed tar a 1-2
hundreds mb smaller.
The `GCC 5.2.0` in the package supports `libgcc` as a shared library,
this is a problem since
when compiling with -shared the produced dll now has a dependency on
`libgcc_s_sjlj-1.dll`.
To solve this the flag `-static-libgcc` is now being used for all GCC
calls on windows.
Test Plan:
./validate was ran both on x86 and x86_64 windows and compared against
the baseline.
A few test were failing due to Ld no longer being noisy. These were
updated.
The changes to the configure script *should* be validated by the build
bots for the other platforms before landing
Reviewers: simonmar, awson, bgamari, austin, thomie
Reviewed By: thomie
Subscribers: #ghc_windows_task_force, thomie, awson
Differential Revision: https://phabricator.haskell.org/D1123
GHC Trac Issues: #10726, #9014, #9218, #10435
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