the newly modified library compiles with no internal undefined symbols

there are still some linking issues due to non having resolved all the
math library stuff just yet. these are being resolved.

this commit removes all Graph, DistGraph, DistMultiVec, SparseMatrix
and DistSparseMatrix routines. hydrogen will only support dense linear
algebra.

CMakeLists.txt

@@ -1,6 +1,6 @@
-cmake_minimum_required(VERSION 3.4)
+cmake_minimum_required(VERSION 3.5)
 
-project(Hydrogen CXX)
+project(Hydrogen C CXX)
 set(HYDROGEN_VERSION_MAJOR 0)
 set(HYDROGEN_VERSION_MINOR 1)
 
@@ -20,6 +20,12 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
 # Legacy options, with EL_ prefix intact
 option(BINARY_SUBDIRECTORIES "Install binaries into tree based on type" ON)
 
+
+
+#
+# MEMORY-RELATED OPTIONS
+#
+
 option(EL_USE_64BIT_INTS "Use 64-bit integers for El indexing" OFF)
 option(EL_USE_64BIT_BLAS_INTS "Use 64-bit integers for BLAS/LAPACK" OFF)
 if(EL_USE_64BIT_BLAS_INTS)
@@ -32,6 +38,20 @@ mark_as_advanced(EL_ZERO_INIT)
 option(EL_DISABLE_VALGRIND "Prevent Elemental from looking for valgrind?" OFF)
 mark_as_advanced(EL_DISABLE_VALGRIND)
 
+#
+# OpenMP
+#
+
+# At one point, a bug was found in IBM's C++ compiler for Blue Gene/P,
+# where OpenMP statements of the form a[i] += alpha b[i], with complex data,
+# would segfault and/or return incorrect results
+option(EL_AVOID_OMP_FMA "Avoid a bug in the IBM compilers." OFF)
+mark_as_advanced(EL_AVOID_OMP_FMA)
+
+#
+# MPI
+#
+
 option(EL_USE_CUSTOM_ALLTOALLV "Avoid MPI_Alltoallv for performance reasons" ON)
 mark_as_advanced(EL_USE_CUSTOM_ALLTOALLV)
 
@@ -41,12 +61,6 @@ mark_as_advanced(EL_USE_CUSTOM_ALLTOALLV)
 option(EL_AVOID_COMPLEX_MPI "Avoid potentially buggy complex MPI routines" ON)
 mark_as_advanced(EL_AVOID_COMPLEX_MPI)
 
-# At one point, a bug was found in IBM's C++ compiler for Blue Gene/P,
-# where OpenMP statements of the form a[i] += alpha b[i], with complex data,
-# would segfault and/or return incorrect results
-option(EL_AVOID_OMP_FMA "Avoid a bug in the IBM compilers." OFF)
-mark_as_advanced(EL_AVOID_OMP_FMA)
-
 # Due to a subtle flaw in the Blue Gene/P extensions for MPICH2, treating
 # floating-point data as a collection of byte-sized objects results in a
 # better algorithm being chosen for MPI_Allgather. This should not effect
@@ -60,6 +74,10 @@ option(EL_REDUCE_SCATTER_BLOCK_VIA_ALLREDUCE
        "AllReduce based block MPI_Reduce_scatter" OFF)
 mark_as_advanced(EL_REDUCE_SCATTER_BLOCK_VIA_ALLREDUCE)
 
+#
+# Runtime warnings
+#
+
 # Print a warning any time a redistribution is performed which unpacks a
 # large amount of data with a non-unit stride
 option(EL_CACHE_WARNINGS "Warns when using cache-unfriendly routines" OFF)
@@ -77,6 +95,22 @@ option(EL_VECTOR_WARNINGS
        "Warn when vector redistribution chances are missed" OFF)
 mark_as_advanced(EL_VECTOR_WARNINGS)
 
+#
+# Find third-party libraries
+#
+
+include(FindAndVerifyMPI)
+
+# FIXME: GET RID OF FORTRAN
+include(detect/Fortran)
+
+# External projects build internally
+# TODO Investigate why
+add_subdirectory(external/pmrrr)
+
+# Add SuiteSparse (TODO: Why bundled here?)
+add_subdirectory(external/suite_sparse)
+include_directories(external/suite_sparse/include)
 
 # Macro for setting up full paths
 macro(set_full_path VAR)
@@ -94,6 +128,19 @@ set(HYDROGEN_SOURCES)
 add_subdirectory(include)
 add_subdirectory(src)
 
-add_library(hydrogen "${HYDROGEN_SOURCES}" "${HYDROGEN_HEADERS}")
-
+configure_file("${PROJECT_SOURCE_DIR}/cmake/configure_files/config.h.in"
+  "${PROJECT_BINARY_DIR}/include/El/config.h")
 
+add_library(hydrogen "${HYDROGEN_SOURCES}" "${HYDROGEN_HEADERS}")
+target_include_directories(hydrogen PUBLIC
+  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include/El>
+  $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
+  $<INSTALL_INTERFACE:include/El>)
+target_link_libraries(hydrogen PUBLIC pmrrr)
+target_link_libraries(hydrogen PUBLIC MPI::MPI_CXX)
+target_link_libraries(hydrogen PUBLIC lapack blas)
+
+if (BUILD_SHARED_LIBS)
+  target_link_libraries(hydrogen PUBLIC "-Wl,-no-undefined")
+endif()

cmake/detect/Fortran.cmake

@@ -30,6 +30,7 @@ endif()
 # argument for enable_language is still completely broken as of 3.0.2
 workaround_9220(Fortran FORTRAN_WORKS)
 if(FORTRAN_WORKS)
+  enable_language(C OPTIONAL)
   enable_language(Fortran OPTIONAL)
   set(EL_HAVE_F90_INTERFACE FALSE)
   if(CMAKE_Fortran_COMPILER_SUPPORTS_F90)