[commit: ghc] master: Enter iserv-proxy (d463107)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/d4631078ece3cfa4179c70f5937738be72659dba/ghc

>---------------------------------------------------------------

commit d4631078ece3cfa4179c70f5937738be72659dba
Author: Moritz Angermann <moritz.angermann at gmail.com>
Date:   Mon Apr 10 21:38:45 2017 -0400

    Enter iserv-proxy
    
    With the introduction of -fexternal-interpreter we are
    now able to compile template haskell via an extern iserv process.
    
    This however is restricted to the same host, and can therefore
    not be used with crosscompilers where the iserv slave process
    needs to run on a different machine than the cross compiling
    haskell compiler.
    
    This diff breaks up iserv into a library and the iserv-bin binary.
    It also introduces the iserv-proxy, a proxy instance that the
    haskell compiler can talk to, and which forwards the calls
    to the iserv slave on a different machine, as well as providing
    some extra functionarily (sending files that are not available
    on the machine the slave runs on), as well as forwarding from
    the slave to the haskell compiler, when the slave needs to
    interrogate the haskell compiler.
    
    The iserv library now also exports the startSlave function to be
    called by the application that implements the slave on the target.
    
    The simplest such app would probably look something like:
    
    ```
    extern void startServ(bool, const char *);
    
    int main(int argc, char * argv[]) {
      hs_init(NULL, NULL);
      startServ(false,"/tmp");
      while(1);
    }
    ```
    
    Special thanks to Shea Levy for the first draft of the iserv-remote,
    from which I took some inspiration.
    
    The `Buildable` flags are due to ghc-cabal not being able to build
    more than a single target.  Please note that only the stock iserv-bin
    is supposed to be built *with* ghc.  The library and proxy are supposed
    to be built outside of ghc.  Yet I believe that this code should live
    together with iserv.
    
    Reviewers: simonmar, ezyang, goldfire, austin, rwbarton, bgamari
    
    Reviewed By: simonmar
    
    Subscribers: luite, ryantrinkle, shlevy, thomie
    
    Differential Revision: https://phabricator.haskell.org/D3233


>---------------------------------------------------------------

d4631078ece3cfa4179c70f5937738be72659dba
 iserv/iserv-bin.cabal         | 113 ++++++++++++++++++-
 iserv/proxy-src/Remote.hs     | 255 ++++++++++++++++++++++++++++++++++++++++++
 iserv/src/{Main.hs => Lib.hs} |  64 ++---------
 iserv/src/Main.hs             |  70 ++----------
 iserv/src/Remote/Message.hs   |  48 ++++++++
 iserv/src/Remote/Slave.hs     | 124 ++++++++++++++++++++
 6 files changed, 552 insertions(+), 122 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 d4631078ece3cfa4179c70f5937738be72659dba