CMake installation method

.github/workflows/github_cmake_gnu.yaml

@@ -0,0 +1,30 @@
+name: Build libcFMS test with CMake
+
+on: [push, pull_request]
+
+# cancel running jobs if theres a newer push
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+
+jobs:
+  cmake_install:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/noaa-gfdl/fms/fms-ci-rocky-gnu:13.2.0
+      env:
+        PKG_CONFIG_PATH: "/opt/views/view/lib64/pkgconfig:/opt/views/view/lib/pkgconfig:/opt/views/view/share/pkgconfig"
+    steps:
+    - name: checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: 'recursive'
+    - name: Generate makefiles with CMake
+      run: |
+        cmake -B build -DCFMS_TESTS=on -DNetCDF_ROOT=/opt/view -DLIBYAML_ROOT=/opt/view
+    - name: Build library and tests
+      run: make -C build
+    - name: Run tests
+      run: cd build && ctest --output-on-failure
+

CMakeLists.txt

@@ -0,0 +1,107 @@
+#***********************************************************************
+#*                             Apache License 2.0
+#*
+#* This file is part of the GFDL Flexible Modeling System (FMS).
+#*
+#* Licensed under the Apache License, Version 2.0 (the "License");
+#* you may not use this file except in compliance with the License.
+#* You may obtain a copy of the License at
+#*
+#*     http://www.apache.org/licenses/LICENSE-2.0
+#*
+#* FMS is distributed in the hope that it will be useful, but WITHOUT
+#* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied;
+#* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+#* PARTICULAR PURPOSE. See the License for the specific language
+#* governing permissions and limitations under the License.
+#***********************************************************************
+
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
+
+# Build options
+option(PORTABLE_KINDS "Enable compiler defition -DPORTABLE_KINDS" ON)
+option(WITH_YAML "Enable compiler definition -Duse_yaml" ON)
+option(CFMS_TESTS "Enable compiling of test scripts" OFF)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+include(FetchContent)
+
+#Define the cmake project
+project(cFMS
+    VERSION 2026.01.0
+    DESCRIPTION "C Access to GFDL FMS Library"
+    HOMEPAGE_URL "https://github.com/NOAA-GFDL/cFMS"
+    LANGUAGES C Fortran)
+
+if(NOT CMAKE_C_COMPILER_ID MATCHES "^(Intel|GNU|Clang|IntelLLVM)$")
+    message(
+        WARNING "Compiler not officially supported: ${CMAKE_C_COMPILER_ID)}"
+    )
+endif()
+
+if(NOT CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel|GNU|IntelLLVM)$")
+    message(
+        WARNING "Compiler not officially supported: ${CMAKE_Fortran_COMPILER_ID}"
+    )
+endif()
+
+# Find dependencies
+
+FetchContent_Declare(
+    FMS
+    GIT_REPOSITORY https://github.com/NOAA-GFDL/FMS.git
+    GIT_TAG 043ab2f6037af92997aa72a467430e95c03652ae
+)
+FetchContent_MakeAvailable(FMS)
+
+list(APPEND cfms_src_files
+  c_constants/c_constants.F90
+  c_data_override/c_data_override.F90
+  c_diag_manager/c_diag_manager.F90
+  c_fms/c_fms.F90
+  c_fms_utils/c_fms_utils.F90
+  c_grid_utils/c_grid_utils.F90
+  c_horiz_interp/c_horiz_interp.F90
+)
+
+list(APPEND cfms_header_files
+  c_constants/c_constants.h
+  c_data_override/c_data_override.h
+  c_diag_manager/c_diag_manager.h
+  c_fms/c_fms.h
+  c_grid_utils/c_grid_utils.h
+  c_horiz_interp/c_horiz_interp.h
+)
+
+add_library(cFMS SHARED
+    ${cfms_src_files}
+)
+
+target_link_libraries(cFMS PUBLIC
+  FMS::fms
+  ${LIBYAML_LIBRARIES}
+)
+
+target_include_directories(cFMS PRIVATE
+  c_data_override/include
+  c_diag_manager/include
+  c_fms/include
+  c_fms_utils/include
+  c_horiz_interp/include
+  ${CMAKE_CURRENT_SOURCE_DIR}/FMS/include
+)
+
+install(TARGETS cFMS
+    LIBRARY DESTINATION ${CMAKE_INSTALL_PREFIX}
+)
+install(FILES ${cfms_header_files}
+    DESTINATION ${CMAKE_INSTALL_PREFIX}/include)
+
+# Tests
+if(CFMS_TESTS)
+    enable_testing()
+    add_subdirectory(test_cfms)
+endif()
+
+
+

c_fms/c_fms.F90

@@ -222,7 +222,7 @@ subroutine cFMS_declare_pelist(npes, pelist, name, commID) bind(C, name="cFMS_de
       integer, intent(in) :: npes
       integer, intent(in) :: pelist(npes)
       character(c_char), intent(in), optional :: name(NAME_LENGTH)
-      integer, intent(out), optional :: commID
+      integer, intent(out) :: commID
 
       character(len=NAME_LENGTH) :: name_f=" " !mpp default
 
@@ -252,7 +252,7 @@ subroutine cFMS_get_current_pelist(npes, pelist, name, commID) bind(C, name="cFM
       integer, intent(in) :: npes
       integer, intent(out) :: pelist(npes)
       character(c_char), intent(out), optional :: name(NAME_LENGTH)
-      integer, intent(out), optional :: commID
+      integer, intent(out) :: commID
 
       character(len=NAME_LENGTH) :: name_f=" " !mpp default