add backward-cpp stack trace log utility as a git submodule

.gitmodules

@@ -2,3 +2,6 @@
 	path = external/kokkos
 	url = https://github.com/kokkos/kokkos.git
 	branch = develop
+[submodule "external/backward-cpp"]
+	path = external/backward-cpp
+	url = https://github.com/bombela/backward-cpp.git

CMakeLists.txt

@@ -162,6 +162,7 @@ add_definitions( -Wall )
 #
 # sources
 #
+add_subdirectory(external/backward-cpp)
 add_subdirectory(external/kokkos)
 
 # pass Kokkos include directories to our target application

test/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_subdirectory(kokkos)
 
+add_subdirectory(backward-cpp)
 add_subdirectory(io)
 
 if(USE_MPI)

test/backward-cpp/CMakeLists.txt

@@ -0,0 +1,4 @@
+add_executable(test_segfault
+  test_segfault.cpp
+  ${BACKWARD_ENABLE})
+add_backward(test_segfault)

test/backward-cpp/test_segfault.cpp

@@ -0,0 +1,26 @@
+/**
+ * A minimalist example to use library backward-cpp to pretty print 
+ * error / stack trace...
+ *
+ * for as standalone build:
+ * g++ -DBACKWARD_HAS_DW=1 -g -I../../external/backward-cpp test_segfault.cpp ../../external/backward-cpp/backward.cpp -ldw
+ *
+ */
+
+#include <iostream>
+
+#include "backward.hpp"
+
+void badass_function() {
+        char* ptr = (char*)42;
+        *ptr = 42;
+}
+
+int main(int argc, char* argv[])
+{
+
+  std::cout << "Create a segfault on purpose...\n";
+  badass_function();
+
+  return 0;
+}