Improve Build System

[jbschroder]

Possible build system improvements

• Have Make create an install and lib directory
• Have Make check for a "makefile.local" that can override makefile.inc and also specify the locations of hypre, mfem and other libraries. This file would not be in the repository, so it would make pushing and pulling easier.

[bangerth]

Might I suggest you just switch to cmake right away? CMake automates a lot of the things like building libraries and makes it platform independent. If you're interested, I could help with that. Here, for example, is a first stab at a CMakeLists.txt file:

cmake_minimum_required(VERSION 3.1)

project(BRAID)
set(BRAID_PROJECT_VERSION "3.2")

find_package(MPI REQUIRED)
include_directories(${MPI_INCLUDE_PATH})


set (BRAID_HEADERS 
 braid/_braid.h
 braid/base.h
 braid/status.h
 braid/tape.h
 braid/util.h
 braid/braid.h
 braid/braid_status.h
 braid/braid_test.h)

set (BRAID_SOURCE_FILES 
 braid/access.c
 braid/adjoint.c
 braid/base.c
 braid/braid.c
 braid/braid_status.c
 braid/braid_F90_iface.c
 braid/braid_test.c
 braid/communication.c
 braid/delta.c
 braid/distribution.c
 braid/drive.c
 braid/grid.c
 braid/hierarchy.c
 braid/interp.c
 braid/mpistubs.c
 braid/norm.c
 braid/refine.c
 braid/relax.c
 braid/residual.c
 braid/restrict.c
 braid/space.c
 braid/step.c
 braid/tape.c
 braid/util.c
 braid/uvector.c)


add_library(braid SHARED
    ${BRAID_SOURCE_FILES}
)

set_target_properties(braid PROPERTIES VERSION ${BRAID_PROJECT_VERSION})
target_link_libraries(braid ${MPI_LIBRARIES})

if(MPI_COMPILE_FLAGS)
  set_target_properties(braid PROPERTIES
    COMPILE_FLAGS "${MPI_COMPILE_FLAGS}")
endif()

if(MPI_LINK_FLAGS)
  set_target_properties(braid PROPERTIES
    LINK_FLAGS "${MPI_LINK_FLAGS}")
endif()

set_property(TARGET braid PROPERTY C_STANDARD 11)

If you place this in your top-level directory, and do

cmake .
make

then you will end up with a shared library. I haven't added the code for installation yet, nor what header files need to be exported, but it doesn't require a lot of code altogether.

[bangerth]

For reference, this is modeled on this very nice post: https://stackoverflow.com/questions/17511496/how-to-create-a-shared-library-with-cmake