Remove __GFORTRAN__ workarounds, enforce min version

CHANGELOG.md

@@ -92,6 +92,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
     - Add helper script for regression test work
 - For ACG, only declare pointer and get_pointer for MAPL_STATEITEM_FIELD
 - For ACG, add spec_filters to generalize testing specs
+- Enforce minimum supported gfortran versions (14.4, 15.2, 16.1) in `CMakeLists.txt`
+  via a `CMAKE_Fortran_COMPILER_VERSION` check that fails the configure step with
+  `FATAL_ERROR` on older, buggy compiler releases; with this floor in place, the
+  `__GFORTRAN__`-guarded workaround subroutines for direct assignment to
+  derived-type actual results (previously needed due to a gfortran bug) were
+  removed from `GenericGridComp.F90`, `StateRegistry_Extensions_smod.F90`, and
+  `GenericCoupler.F90` in favor of plain assignment
 
 ### Fixed
 
@@ -102,6 +109,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Removed
 
+- Dead `BUILD_SHARED_MAPL` option and `MAPL_LIBRARY_TYPE` logic in `CMakeLists.txt`,
+  left over from MAPL v2 and no longer used
 - Removed `ESMF_HCONFIGSET_HAS_INTENT_INOUT` preprocessor conditionals now that
   ESMF 9.0.0 is required (≥ 8.9.0, where `ESMF_HConfigSet` gained `intent(inout)`).
   The `intent(inout)` declarations in `HConfigUtilities.F90`, `OuterMetaComponent.F90`,

CMakeLists.txt

@@ -68,14 +68,23 @@ list (PREPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 # automatic build-tree RPATH (absolute paths) for targets in the build tree.
 set (CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
 
-option (BUILD_SHARED_MAPL "Build shared MAPL libraries" ON)
-if (BUILD_SHARED_MAPL)
-  set (MAPL_LIBRARY_TYPE SHARED)
-else ()
-  set (MAPL_LIBRARY_TYPE STATIC)
+# MAPL3 only supports gfortran 14.4+, 15.2+, and 16.1+ due do
+# compiler issues with older versions
+if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
+  set(_version "${CMAKE_Fortran_COMPILER_VERSION}")
+
+  if(_version VERSION_LESS "14.4"
+     OR (_version VERSION_GREATER_EQUAL "15.0"
+         AND _version VERSION_LESS "15.2")
+     OR (_version VERSION_GREATER_EQUAL "16.0"
+         AND _version VERSION_LESS "16.1"))
+    message(FATAL_ERROR
+      "Unsupported GNU Fortran version ${_version}. "
+      "Minimum supported versions are 14.4 for GCC 14, "
+      "15.2 for GCC 15, and 16.1 for GCC 16."
+    )
+  endif()
 endif()
-message (STATUS "Building MAPL as ${MAPL_LIBRARY_TYPE} libraries")
-
 
 # Some users of MAPL build GFE libraries inline with their application
 # using an add_subdirectory() call rather than as a pre-build library.

superstructure/generic/GenericGridComp.F90

@@ -117,28 +117,11 @@ recursive type(ESMF_GridComp) function create_grid_comp_primary( &
       ! must be processed later as the information gets stored in the ComponentSpec.
 
       user_gc_driver = GriddedComponentDriver(user_gridcomp)
-#ifndef __GFORTRAN__
       outer_meta = OuterMetaComponent(gridcomp, user_gc_driver, set_services, config)
-#else
-      ! GFortran 12 & 13 cannot directly assign to outer_meta.  But
-      ! the assignment works for an object without the POINTER
-      ! attribute.  An internal procedure is a workaround, but
-      ! ... ridiculous.
-      call ridiculous(outer_meta, OuterMetaComponent(gridcomp, user_gc_driver, set_services, config))
-#endif
       call outer_meta%init_meta(_RC)
 
       _RETURN(ESMF_SUCCESS)
       _UNUSED_DUMMY(unusable)
-#ifdef __GFORTRAN__
-   contains
-
-      subroutine ridiculous(a, b)
-         type(OuterMetaComponent), intent(out) :: a
-         type(OuterMetaComponent), intent(in) :: b
-         a = b
-      end subroutine ridiculous
-#endif
    end function create_grid_comp_primary
 
 

superstructure/generic/registry/StateRegistry_Extensions_smod.F90

@@ -39,27 +39,13 @@ module subroutine add_family(this, virtual_pt, family, rc)
 
       integer :: status
       type(ExtensionFamily), pointer :: new_family
-      
+
       call this%add_virtual_pt(virtual_pt, _RC)
       new_family => this%family_map%at(virtual_pt, _RC)
-#ifndef __GFORTRAN__      
       new_family = family
-#else
-      call ridiculous(new_family, family)
-#endif
 
       _RETURN(_SUCCESS)
 
-#ifdef __GFORTRAN__      
-   contains
-
-      subroutine ridiculous(a, b)
-         type(ExtensionFamily), intent(out) :: a
-         type(ExtensionFamily), intent(in) :: b
-         a = b
-      end subroutine ridiculous
-#endif
-
    end subroutine add_family
 
    module subroutine add_primary_spec(this, virtual_pt, spec, rc)
@@ -74,7 +60,7 @@ module subroutine add_primary_spec(this, virtual_pt, spec, rc)
       call this%owned_items%push_back(spec)
       family = ExtensionFamily(this%owned_items%back())
       call this%add_family(virtual_pt, family, _RC)
-      
+
       _RETURN(_SUCCESS)
 
    end subroutine add_primary_spec
@@ -215,7 +201,7 @@ recursive module function extend(registry, v_pt, goal_spec, rc) result(extension
 
           ! Leave commented code here.   This should be migrated to use pflogger in the future.
           ! Useful debugging point.
-          
+
 !#          block
 !#            type(StateItemSpec), pointer :: spec
 !#            spec => closest_extension

superstructure/generic/transforms/GenericCoupler.F90

@@ -38,27 +38,13 @@ function make_coupler(transform, source, rc) result(coupler_gridcomp)
       coupler_gridcomp = ESMF_GridCompCreate(name=name, contextFlag=ESMF_CONTEXT_PARENT_VM, _RC)
       call attach_coupler_meta(coupler_gridcomp, _RC)
       coupler_meta => get_coupler_meta(coupler_gridcomp, _RC)
-#ifndef __GFORTRAN__
       coupler_meta = CouplerMetaComponent(transform, source)
-#else
-      call ridiculous(coupler_meta, CouplerMetaComponent(transform,source))
-#endif
       call ESMF_GridCompSetServices(coupler_gridComp, setServices, _RC)
 
       _RETURN(_SUCCESS)
 
-   contains
-
-#ifdef __GFORTRAN__
-      subroutine ridiculous(a, b)
-         type(CouplerMetaComponent), intent(out) :: a
-         type(CouplerMetaComponent), intent(in) :: b
-         a = b
-      end subroutine ridiculous
-#endif
-
    end function make_coupler
-   
+
    subroutine setServices(gridcomp, rc)
       type(ESMF_GridComp) :: gridcomp
       integer, intent(out) :: rc
@@ -81,7 +67,7 @@ recursive subroutine initialize(gridcomp, importState, exportState, clock, rc)
       type(ESMF_State) :: exportState
       type(ESMF_Clock) :: clock
       integer, intent(out) :: rc
-      
+
       integer :: status
       type(CouplerMetaComponent), pointer :: meta
 
@@ -98,7 +84,7 @@ recursive subroutine update(gridcomp, importState, exportState, clock, rc)
       type(ESMF_State) :: exportState
       type(ESMF_Clock) :: clock
       integer, intent(out) :: rc
-      
+
       integer :: status
       type(CouplerMetaComponent), pointer :: meta
 
@@ -109,14 +95,14 @@ recursive subroutine update(gridcomp, importState, exportState, clock, rc)
       _RETURN(_SUCCESS)
    end subroutine update
 
-   
+
    recursive subroutine invalidate(gridcomp, importState, exportState, clock, rc)
       type(ESMF_GridComp) :: gridcomp
       type(ESMF_State) :: importState
       type(ESMF_State) :: exportState
       type(ESMF_Clock) :: clock
       integer, intent(out) :: rc
-      
+
       integer :: status
       type(CouplerMetaComponent), pointer :: meta
 
@@ -134,16 +120,16 @@ recursive subroutine clock_advance(gridcomp, importState, exportState, clock, rc
       type(ESMF_State) :: exportState
       type(ESMF_Clock) :: clock
       integer, intent(out) :: rc
-      
+
       integer :: status
       type(CouplerMetaComponent), pointer :: coupler_meta
-      
+
       coupler_meta => get_coupler_meta(gridcomp)
       call coupler_meta%clock_advance(importState, exportState, clock, _RC)
 
       ! TBD: is this where it belongs?
       call ESMF_ClockAdvance(clock, _RC)
-     
+
       _RETURN(_SUCCESS)
    end subroutine clock_advance