Merge pull request #48 from Goddard-Fortran-Ecosystem/cmake-cache-sou…

…rce-compilation-tests

CMake: Don't rerun source-compilation tests if they've already run

cmake/CheckFortranSource.cmake

@@ -0,0 +1,54 @@
+function (CHECK_FORTRAN_SOURCE_RUN file var)
+  if (NOT DEFINED ${var})
+    try_run (
+      run compile
+      ${CMAKE_BINARY_DIR}
+      ${file}
+      CMAKE_FLAGS "-DCOMPILE_DEFINITIONS=${CMAKE_REQUIRED_DEFINITIONS}"
+      RUN_OUTPUT_VARIABLE ${var}
+      )
+
+    # Successful runs return "0", which is opposite of CMake sense of "if":
+    if (NOT compile OR run)
+      if (NOT CMAKE_REQUIRED_QUIET)
+        message(STATUS "Performing Test ${var}: FAILURE")
+      endif ()
+      return()
+    endif()
+
+    string(STRIP "${${var}}" ${var})
+    if (NOT CMAKE_REQUIRED_QUIET)
+      message(STATUS "Performing Test ${var}: SUCCESS (value=${${var}})")
+    endif ()
+    set(${var} ${${var}} CACHE STRING "" FORCE)
+
+  endif()
+  add_definitions(-D${var}=${${var}})
+endfunction (CHECK_FORTRAN_SOURCE_RUN)
+
+
+function (CHECK_FORTRAN_SOURCE_COMPILE file var)
+  if (NOT DEFINED ${var})
+    try_compile (
+      code_compiles
+      ${CMAKE_BINARY_DIR}
+      ${file}
+      CMAKE_FLAGS "-DCOMPILE_DEFINITIONS=${CMAKE_REQUIRED_DEFINITIONS}"
+      )
+
+    if (NOT ${code_compiles})
+      if (NOT CMAKE_REQUIRED_QUIET)
+        message (STATUS "Performing Test ${var}: BUILD FAILURE")
+      endif ()
+      return()
+    endif()
+
+    set(${var} SUCCESS)
+    if (NOT CMAKE_REQUIRED_QUIET)
+      message (STATUS "Performing Test ${var}: SUCCESS")
+    endif ()
+
+    set(${var} ${${var}} CACHE STRING "" FORCE)
+  endif()
+  add_definitions(-D${var})
+endfunction (CHECK_FORTRAN_SOURCE_COMPILE)

cmake/check_intrinsic_kinds.cmake

@@ -1,4 +1,4 @@
-include (fortran_try)
+include (CheckFortranSource)
 
 CHECK_Fortran_SOURCE_RUN (
   ${CMAKE_CURRENT_LIST_DIR}/trial_sources/LOGICAL_DEFAULT_KIND.F90