[commit: ghc] master: rts linker: Introduce MachOTypes (8ed29b5)

[Gabor Greif]

This commit 8ed29b50376856018dfbbcbd6d728c69af0c9f29 introduced a
compilation failure with gcc4.4 (my gcc). The typedef-name
`SectionFormatInfo` is redefined.

Here is the reason:
http://stackoverflow.com/questions/6526322/why-redefinition-of-typedef-error-with-gcc-4-3-but-not-gcc-4-6

I have a fix in testing, will commit shortly.

Cheers,

    Gabor

On 3/27/17, git at git.haskell.org <git at git.haskell.org> wrote:
> Repository : ssh://git@git.haskell.org/ghc
>
> On branch  : master
> Link       :
> http://ghc.haskell.org/trac/ghc/changeset/8ed29b50376856018dfbbcbd6d728c69af0c9f29/ghc
>
>>---------------------------------------------------------------
>
> commit 8ed29b50376856018dfbbcbd6d728c69af0c9f29
> Author: Moritz Angermann <moritz.angermann at gmail.com>
> Date:   Tue Mar 21 10:59:49 2017 -0400
>
>     rts linker: Introduce MachOTypes
>
>     This diff introduces MachOTypes, to reduce the need to typing `struct`
>     all the time.  It also coaleces the 64 and non 64 structs. It also adds
>     additional fiedls to the object code structure for macho, which makes
>     working with macho object code much simpler and requires less passing
>     around of variabls or address recomputation for the header, symbol
>     table, etc...
>
>     Furthermore this diff introduces a type for a linked list of stubs.
>
>     I had to move the #ifdef from the bottom of the file up, to be able to
>     extend the object code structure conditional on the use of the macho
> file format.
>
>     This is just one of the pieces for the rts linker
>     support for ios (aarch64-macho)
>
>     ---
>
>     The following diagram and legend tries to explain the dependencies a
>     bit:
>     ```
>       .- D3240
>       v
>     D3255 <- D3252 <- D3251 <- This
>       ^
>       '- D3238
>     ```
>
>     - In D3238 we started allowing preloading object code with mmap
>       in iOS, where we can't have r+w+x.
>     - In D3239 we introduced a richer extension of the object code
>       data type to make working with mach-o files easier.
>     - In D3240 we set the stage to allow loading archives (.a) on iOS
>     - In D3251 we added init and deinit functions to populate and
>       depopulate the enriched object code data structure for mach-o
>       files.
>     - In D3252 we refactored most of the MachO.c file to use the
>       new types and data structure.
>     - in D3255 we finally introduce the aarch64-mach-o linker.
>
>     Reviewers: austin, erikd, simonmar, rwbarton, bgamari
>
>     Subscribers: rwbarton, thomie, ryantrinkle
>
>     Differential Revision: https://phabricator.haskell.org/D3239
>
>
>>---------------------------------------------------------------
>
> 8ed29b50376856018dfbbcbd6d728c69af0c9f29
>  rts/Linker.c            |   6 +++
>  rts/LinkerInternals.h   |  28 +++++++++-
>  rts/linker/MachOTypes.h | 133
> ++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 165 insertions(+), 2 deletions(-)
>
> Diff suppressed because of size. To see it, use:
>
>     git diff-tree --root --patch-with-stat --no-color --find-copies-harder
> --ignore-space-at-eol --cc 8ed29b50376856018dfbbcbd6d728c69af0c9f29
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