Adds aarch64 linker for mach-o files.

This is the final commit that ties them all together. Here we
add the aarch64 linker for macho files.

- 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 datastructure.

This commit will than finally add the aarch64 (arm64) linker
for mach-o files to ghc, using the improved foundation we
have constructed above.

The dependency structure therefore is as follows

```
  .- D3240
  v
This <- D3252 <- D3251 <- D3239
  ^
  '- D3238
```

Depends: D3252, D3240, D3238

Test Plan:
To test this with iOS, we also need the remote-iserv
diff D3233. With all that in place, proceed as follows:

- Build ghc for the host

```
  ghc $ ./configure --prefix=/test/opt \
    --disable-large-address-space \
    --with-llc=/path/to/llvm-3.9/bin/llc \
    --with-opt=/path/to/llvm-3.9/bin/opt
  # edit mk/build.mk to specify quick
  ghc $ make && make install
```

- Build ghc for ios

```
  ghc $ ./configure --target=aarch64-apple-darwin14 \
    --prefix=/test/opt \
    --disable-large-address-space \
    --with-llc=/path/to/llvm-3.9/bin/llc \
    --with-opt=/path/to/llvm-3.9/bin/opt \
    --with-ghc=/test/bin/ghc \
    --enable-bootstrap-with-devel-snapshot
  # edit mk/build.mk to specify quick-cross
  ghc $ make && make install

```
- Obtain the iOS wrapper scripts from
https://github.com/angerman/ghc-ios-scripts
  and place them in PATH.

- Build iserv-proxy for the host

```
  ghc/iserv $ cabal install -fproxy -flibrary

```
- Build iserv-library for the target

```
  # build cryptonite without integer-gmp
  ghc/iserv $ aarch64-apple-darwin14-cabal install cryptonite
-f-integer-gmp
  ghc/iserv $ aarch64-apple-darwin14-cabal install -flibrary
```

- Create an iOS application with the following `main.m`:
```
  #import <UIKit/UIKit.h>
  #include "HsFFI.h"
  extern void startSlave(bool, int, const char *);

  int main(int argc, char * argv[]) {
    const char * documents_path = [[[NSFileManager defaultManager]
URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask]
firstObject].path.UTF8String;

    hs_init(NULL, NULL);

    startSlave(false, 5000, documents_path);

    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, nil);
    }
  }
```

  and link it with: the iserv archive from
`~/.cabal/lib/aarch64-ios-ghc`
  as well as all dependent archives.

- Build, Install and Launch the iserv-slave application on your iphone

- Compile some Template Haskell code with the
`aarch64-apple-darwin14-ghc`,
  through the `iserv-proxy`

```
  app $ aarch64-apple-darwin14-ghc Module.hs \
   -threaded -staticlib \
   -outputdir build/aarch64 -pgmlibtool libtool-quiet -stubdir . \
   -fexternal-interpreter \
   -pgmi=$HOME/.cabal/bin/iserv-proxy \
   -opti10.0.0.1 \
   -opti5000
```
  where 10.0.0.1 is the ip of your iserv-slave.

  magic.

Reviewers: rwbarton, bgamari, austin, hvr, erikd, simonmar

Subscribers: thomie, erikd, ryantrinkle

Differential Revision: https://phabricator.haskell.org/D3255

1 files changed, 1 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index dd338a8418..547e9b1551 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1084,7 +1084,7 @@ case ${TargetOS} in
     linux|freebsd|dragonfly|netbsd|openbsd|kfreebsdgnu|gnu|solaris2)
         RtsLinkerUseMmap=1
         ;;
-    darwin)
+    darwin|ios)
         # Don't use mmap on powerpc/darwin as the mmap there doesn't support
         # reallocating. Reallocating is needed to allocate jump islands just
         # after each object image. Jumps to these jump islands use relative