Improved cmake usage.

1) Can now build in standalone.  Logic must be retested in a nested
   fixture before this can go to master.
2) Should now do a proper cmake install.

Author: Tom Clune

.gitignore

@@ -0,0 +1,2 @@
+/@cmake
+/Externals.cfg~

CMakeLists.txt

@@ -1,10 +1,30 @@
-cmake_policy (SET CMP0048 NEW) # VERSION in project()
+cmake_minimum_required (VERSION 3.13)
+cmake_policy (SET CMP0053 NEW)
+cmake_policy (SET CMP0054 NEW)
 
 project (
   MAPL
   VERSION 1.1
   LANGUAGES Fortran CXX C)  # Note - CXX is required for ESMF
 
+if (NOT COMMAND esma) # build as standalone project
+  # Invoke checkout_ externals, but only the first time we
+  # configure.  
+  if (NOT SKIP_MANAGE_EXTERNALS)
+    execute_process (
+      COMMAND "checkout_externals"
+      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+      )
+  endif ()
+  set(SKIP_MANAGE_EXTERNALS ON CACHE BOOL "Set to skip manage externals step")
+
+  list (APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/@cmake")
+  include (esma)
+endif()
+
+ecbuild_declare_project()
+
+
 # Special case - MAPL_cfio is built twice with two different precisions.
 add_subdirectory (MAPL_cfio MAPL_cfio_r4)
 add_subdirectory (MAPL_cfio MAPL_cfio_r8)
@@ -13,6 +33,7 @@ add_subdirectory (GMAO_pFIO)
 add_subdirectory (MAPL_Base)
 
 # Git transition defect:
-# Uncomment the line below once the dev branch of MAPL has been brough it.
+# Uncomment the line below once the dev branch of MAPL has been brought in.
 #add_subdirectory (Tests)
 
+ecbuild_install_project (NAME MAPL)

Externals.cfg

@@ -0,0 +1,11 @@
+[GEOS_cmake]
+required = True
+repo_url = git@github.com:GEOS-ESM/ESMA_cmake.git
+local_path = ./@cmake
+tag = v1.0.2
+externals = Externals.cfg
+protocol = git
+
+[externals_description]
+schema_version = 1.0.0
+

MAPL_cfio/CMakeLists.txt

@@ -25,15 +25,13 @@ endif ()
 
 set (EOS )
 
-include_directories (${INC_NETCDF})
-include_directories (${INC_ESMF})
-
 set (lib MAPL_cfio_${precision})
 
 esma_add_library (${lib}
   SRCS ${srcs}
   DEPENDENCIES ${ESMF_LIBRARIES}
   )
+target_include_directories (${lib} PUBLIC ${INC_NETCDF} ${INC_ESMF})
 
 if (precision MATCHES "r8")
   string (REPLACE " " ";" flags ${FREAL8})