build: Add CMake config to support building shared libraries (#1559)

NOAA-GFDL · Jul 29, 2024 · 361352e · 361352e
1 parent bc62069
commit 361352e
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Showing 2 changed files with 22 additions and 12 deletions.
diff --git a/CMAKE_INSTRUCTIONS.md b/CMAKE_INSTRUCTIONS.md
@@ -50,17 +50,18 @@ make install
 ```
 
 ### User configurable options:
-By default, FMS is built without `OpenMP` and in `single precision (r4)`
+By default, FMS is built without `OpenMP`, in `single precision (r4)` and delivered in static library files.
 
 The 64BIT and 32BIT precision options will build distinct libraries when enabled with the given default
 real size, libfms_r4 or libfms_r8.
 
 The following build options are available:
 ```
--DOPENMP   "Build FMS with OpenMP support"        DEFAULT: OFF
--D32BIT    "Build 32-bit (r4) FMS library"        DEFAULT: ON
--D64BIT    "Build 64-bit (r8) FMS library"        DEFAULT: OFF
--DFPIC     "Build with position independent code" DEFAULT: OFF
+-DOPENMP      "Build FMS with OpenMP support"        DEFAULT: OFF
+-D32BIT       "Build 32-bit (r4) FMS library"        DEFAULT: ON
+-D64BIT       "Build 64-bit (r8) FMS library"        DEFAULT: OFF
+-DFPIC        "Build with position independent code" DEFAULT: OFF
+-DSHARED_LIBS "Build shared/dynamic libraries"       DEFAULT: OFF
 
 -DCONSTANTS             "Build with <X> constants parameter definitions"     DEFAULT:GFDL  OPTIONS:GFS|GEOS|GFDL
 -DINTERNAL_FILE_NML     "Enable compiler definition -DINTERNAL_FILE_NML"     DEFAULT: ON

diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -52,10 +52,11 @@ endif()
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
 # Build options
-option(OPENMP "Build FMS with OpenMP support"        OFF)
-option(32BIT  "Build 32-bit (r4) FMS library"         ON)
-option(64BIT  "Build 64-bit (r8) FMS library"        OFF)
-option(FPIC   "Build with position independent code" OFF)
+option(OPENMP      "Build FMS with OpenMP support"        OFF)
+option(32BIT       "Build 32-bit (r4) FMS library"         ON)
+option(64BIT       "Build 64-bit (r8) FMS library"        OFF)
+option(FPIC        "Build with position independent code" OFF)
+option(SHARED_LIBS "Build shared/dynamic libraries"       OFF)
 
 # Options for compiler definitions
 option(INTERNAL_FILE_NML     "Enable compiler definition -DINTERNAL_FILE_NML"      ON)
@@ -360,8 +361,15 @@ foreach(kind ${kinds})
   endif()
 
   # FMS (C + Fortran)
-  add_library(${libTgt} STATIC $<TARGET_OBJECTS:${libTgt}_c>
-                               $<TARGET_OBJECTS:${libTgt}_f>)
+  if (SHARED_LIBS)
+      message(STATUS "Shared library target: ${libTgt}")
+      add_library(${libTgt} SHARED $<TARGET_OBJECTS:${libTgt}_c>
+                                   $<TARGET_OBJECTS:${libTgt}_f>)
+  else ()
+      message(STATUS "Static library target: ${libTgt}")
+      add_library(${libTgt} STATIC $<TARGET_OBJECTS:${libTgt}_c>
+                                   $<TARGET_OBJECTS:${libTgt}_f>)
+  endif ()
 
   target_include_directories(${libTgt} PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
@@ -397,7 +405,8 @@ foreach(kind ${kinds})
   target_compile_definitions(${libTgt} PRIVATE "${fms_defs}")
   target_compile_definitions(${libTgt} PRIVATE "${${kind}_defs}")
 
-  target_link_libraries(${libTgt} PUBLIC NetCDF::NetCDF_Fortran
+  target_link_libraries(${libTgt} PUBLIC NetCDF::NetCDF_C
+                                         NetCDF::NetCDF_Fortran
                                          MPI::MPI_Fortran)
 
   if(OpenMP_Fortran_FOUND)