Added a test for building an MPI project. Building for the MPI and C API tests is now also disabled by default.

CMakeLists.txt

@@ -23,7 +23,8 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR})
 option(BUILD_DEBUG              "Builds the program with extensive error checking"          OFF)
 option(BUILD_STANDALONE         "Builds the standalone Astaroth"                            ON)
 option(BUILD_RT_VISUALIZATION   "Builds the module for real-time visualization using SDL2"  OFF)
-option(BUILD_C_API_TEST         "Builds a C program to test whether the API is conformant"  ON)
+option(BUILD_C_API_TEST         "Builds a C program to test whether the API is conformant"  OFF)
+option(BUILD_MPI_TEST           "Builds a C program to test whether MPI works"              OFF)
 option(DOUBLE_PRECISION         "Generates double precision code"                           OFF)
 option(MULTIGPU_ENABLED         "If enabled, uses all the available GPUs"                   ON)
 option(ALTER_CONF               "If enabled, loads astaroth.conf from the build directory"  OFF)
@@ -60,3 +61,7 @@ endif ()
 if (BUILD_C_API_TEST)
     add_subdirectory(src/ctest)
 endif ()
+
+if (BUILD_MPI_TEST)
+    add_subdirectory(src/mpitest)
+endif ()

src/mpitest/CMakeLists.txt

@@ -0,0 +1,12 @@
+##############################################
+##    CMakeLists.txt for the MPI test       ##
+##############################################
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+find_package(MPI REQUIRED)
+
+add_executable(mpitest main.c)
+target_include_directories(mpitest PRIVATE ${MPI_C_INCLUDE_PATH})
+target_link_libraries(mpitest PRIVATE ${MPI_C_LIBRARIES} astaroth_core)

src/mpitest/README.txt

@@ -0,0 +1 @@
+This directory is used to test MPI with Astaroth.

src/mpitest/main.c

@@ -0,0 +1,51 @@
+/*
+    Copyright (C) 2014-2019, Johannes Pekkilae, Miikka Vaeisalae.
+
+    This file is part of Astaroth.
+
+    Astaroth is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Astaroth is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Astaroth.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "astaroth.h"
+
+#include <mpi.h>
+
+int
+main(void)
+{
+    MPI_Init(NULL, NULL);
+
+    int num_processes, process_id;
+    MPI_Comm_size(MPI_COMM_WORLD, &num_processes);
+    MPI_Comm_rank(MPI_COMM_WORLD, &process_id);
+
+    char processor_name[MPI_MAX_PROCESSOR_NAME];
+    int name_len;
+    MPI_Get_processor_name(processor_name, &name_len);
+    printf("Processor %s. Process %d of %d.\n", processor_name, process_id, num_processes);
+
+    AcMeshInfo info = {
+        .int_params[AC_nx] = 128,
+        .int_params[AC_ny] = 64,
+        .int_params[AC_nz] = 32,
+    };
+    acInit(info);
+    acIntegrate(0.1f);
+    acQuit();
+
+    MPI_Finalize();
+    return EXIT_SUCCESS;
+}