Move to C API (#271)

Works around the issues encountered last time (#169) by generating a small C
program which in turn generates the necessary constants, types and
offsets. To avoid the problem of link-time definitions, it uses the
Fortran constants for all handles, which are converted to the C variants
at `MPI_Init`.

This approach has several benefits:
 - No need for CMake or a Fortran compiler
 - No implicit use of gfortran ABI for strings
 - Simpler to extend, as the new functions only need to be added in one place.

I've also taken the liberty splitting the source into several files
based on functionality, which should make it easier to find things.

Author: simonbyrne

.gitignore

@@ -1,11 +1,5 @@
-/deps/VERSION
-/deps/build/
-/deps/deps.jl
-/deps/usr/
-/deps/src/
 libjuliampi.so
 libjuliampi.dylib
 *.cov
 *.mem
 Manifest.toml
-deps/build.log

.travis.yml

@@ -5,7 +5,7 @@ dist: trusty
 os:
   - linux
   - osx
-  
+
 julia:
   - 1.0
   - 1.1
@@ -35,9 +35,8 @@ matrix:
 
 before_install:
   - sh ./conf/travis-install-mpi.sh $MPI_IMPL
-  - export PATH=$HOME/OpenMPI/bin:$HOME/MPICH/bin:$PATH
-  - export CC=mpicc
-  - export FC=mpif90
+  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then export JULIA_MPI_PATH=$HOME/$MPI_IMPL; fi
+  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then export PATH=$HOME/$MPI_IMPL/bin:$PATH; fi
 # Work around OpenMPI attempting to create overly long temporary
 # file names - and erroring as a result
   - export TMPDIR=/tmp

Project.toml

@@ -4,7 +4,6 @@ authors = []
 version = "0.9.0"
 
 [deps]
-BinDeps = "9e28174c-4ba2-5203-b857-d8d62c4213ee"
 Distributed = "8ba89e20-285c-5b6f-9357-94700520ee1b"
 Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
@@ -19,4 +18,4 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Test", "LinearAlgebra"]
+test = ["LinearAlgebra", "Test"]

conf/travis-install-mpi.sh

@@ -44,7 +44,7 @@ case "$os" in
                 wget http://www.mpich.org/static/downloads/3.2.1/$MPICHVER.tar.gz
                 tar -zxf $MPICHVER.tar.gz
                 cd $MPICHVER
-                sh ./configure --prefix=$HOME/MPICH --enable-shared > /dev/null
+                sh ./configure --prefix=$HOME/mpich --enable-shared > /dev/null
                 make -j > /dev/null
                 sudo make install > /dev/null
                 ;;
@@ -55,7 +55,7 @@ case "$os" in
                 wget --no-check-certificate https://www.open-mpi.org/software/ompi/v3.0/downloads/$OMPIVER.tar.gz
                 tar -zxf $OMPIVER.tar.gz
                 cd $OMPIVER
-                sh ./configure --prefix=$HOME/OpenMPI > /dev/null
+                sh ./configure --prefix=$HOME/openmpi > /dev/null
                 make -j > /dev/null
                 sudo make install > /dev/null
                 ;;

deps/.gitignore

@@ -0,0 +1,10 @@
+deps.jl
+build.log
+gen_consts.c
+gen_consts
+
+# no longer used
+VERSION
+build/
+usr/
+src/